| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.felix.dm.impl.dependencies; |
| |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Proxy; |
| import java.util.AbstractMap; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Comparator; |
| import java.util.Dictionary; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import java.util.Properties; |
| import java.util.Set; |
| |
| import org.apache.felix.dm.Component; |
| import org.apache.felix.dm.ComponentDependencyDeclaration; |
| import org.apache.felix.dm.Dependency; |
| import org.apache.felix.dm.DependencyService; |
| import org.apache.felix.dm.InvocationUtil; |
| import org.apache.felix.dm.ServiceDependency; |
| import org.apache.felix.dm.ServiceUtil; |
| import org.apache.felix.dm.impl.SerialExecutor; |
| import org.apache.felix.dm.impl.DefaultNullObject; |
| import org.apache.felix.dm.impl.Logger; |
| import org.apache.felix.dm.tracker.ServiceTracker; |
| import org.apache.felix.dm.tracker.ServiceTrackerCustomizer; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.Constants; |
| import org.osgi.framework.InvalidSyntaxException; |
| import org.osgi.framework.ServiceReference; |
| import org.osgi.service.log.LogService; |
| |
| /** |
| * Service dependency that can track an OSGi service. |
| * |
| * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a> |
| */ |
| public class ServiceDependencyImpl extends DependencyBase implements ServiceDependency, ServiceTrackerCustomizer, |
| ComponentDependencyDeclaration { |
| protected final List m_services = new ArrayList(); |
| protected volatile ServiceTracker m_tracker; |
| protected final BundleContext m_context; |
| protected volatile Class m_trackedServiceName; |
| private volatile Object m_nullObject; |
| private volatile String m_trackedServiceFilter; |
| private volatile String m_trackedServiceFilterUnmodified; |
| private volatile ServiceReference m_trackedServiceReference; |
| private volatile Object m_callbackInstance; |
| private volatile String m_callbackAdded; |
| private volatile String m_callbackChanged; |
| private volatile String m_callbackRemoved; |
| private volatile String m_callbackSwapped; |
| private boolean m_autoConfig; |
| private volatile String m_autoConfigInstance; |
| private boolean m_autoConfigInvoked; |
| private volatile Object m_defaultImplementation; |
| private volatile Object m_defaultImplementationInstance; |
| private boolean m_isAvailable; |
| private volatile boolean m_propagate; |
| private volatile Object m_propagateCallbackInstance; |
| private volatile String m_propagateCallbackMethod; |
| private final Map m_sr = new HashMap(); /* <DependencyService, Set<Tuple<ServiceReference, Object>> */ |
| private final Map m_componentByRank = new HashMap(); /* <Component, Map<Long, Map<Integer, Tuple>>> */ |
| private volatile boolean m_debug = false; |
| private volatile String m_debugKey = null; |
| |
| /** |
| * Executor used to ensure proper synchronization without holding locks. |
| */ |
| private final SerialExecutor m_serial; |
| |
| // ----------------------- Inner classes -------------------------------------------------------------- |
| |
| private static final Comparator COMPARATOR = new Comparator() { |
| public int getRank(ServiceReference ref) { |
| Object ranking = ref.getProperty(Constants.SERVICE_RANKING); |
| if (ranking != null && (ranking instanceof Integer)) { |
| return ((Integer) ranking).intValue(); |
| } |
| return 0; |
| } |
| |
| public int compare(Object a, Object b) { |
| ServiceReference ra = (ServiceReference) a, rb = (ServiceReference) b; |
| int ranka = getRank(ra); |
| int rankb = getRank(rb); |
| if (ranka < rankb) { |
| return -1; |
| } else if (ranka > rankb) { |
| return 1; |
| } |
| return 0; |
| } |
| }; |
| |
| private static final class Tuple /* <ServiceReference, Object> */{ |
| private final ServiceReference m_serviceReference; |
| private final Object m_service; |
| |
| public Tuple(ServiceReference first, Object last) { |
| m_serviceReference = first; |
| m_service = last; |
| } |
| |
| public ServiceReference getServiceReference() { |
| return m_serviceReference; |
| } |
| |
| public Object getService() { |
| return m_service; |
| } |
| |
| public boolean equals(Object obj) { |
| return ((Tuple) obj).getServiceReference().equals(getServiceReference()); |
| } |
| |
| public int hashCode() { |
| return m_serviceReference.hashCode(); |
| } |
| |
| public String toString() { |
| return "{" + m_serviceReference.getProperty(Constants.SERVICE_ID) + "=" + m_service + "}"; |
| } |
| } |
| |
| /** |
| * Entry to wrap service properties behind a Map. |
| */ |
| private static final class ServicePropertiesMapEntry implements Map.Entry { |
| private final String m_key; |
| private Object m_value; |
| |
| public ServicePropertiesMapEntry(String key, Object value) { |
| m_key = key; |
| m_value = value; |
| } |
| |
| public Object getKey() { |
| return m_key; |
| } |
| |
| public Object getValue() { |
| return m_value; |
| } |
| |
| public String toString() { |
| return m_key + "=" + m_value; |
| } |
| |
| public Object setValue(Object value) { |
| Object oldValue = m_value; |
| m_value = value; |
| return oldValue; |
| } |
| |
| public boolean equals(Object o) { |
| if (!(o instanceof Map.Entry)) { |
| return false; |
| } |
| Map.Entry e = (Map.Entry) o; |
| return eq(m_key, e.getKey()) && eq(m_value, e.getValue()); |
| } |
| |
| public int hashCode() { |
| return ((m_key == null) ? 0 : m_key.hashCode()) ^ ((m_value == null) ? 0 : m_value.hashCode()); |
| } |
| |
| private static final boolean eq(Object o1, Object o2) { |
| return (o1 == null ? o2 == null : o1.equals(o2)); |
| } |
| } |
| |
| /** |
| * Wraps service properties behind a Map. |
| */ |
| private final static class ServicePropertiesMap extends AbstractMap { |
| private final ServiceReference m_ref; |
| |
| public ServicePropertiesMap(ServiceReference ref) { |
| m_ref = ref; |
| } |
| |
| public Object get(Object key) { |
| return m_ref.getProperty(key.toString()); |
| } |
| |
| public int size() { |
| return m_ref.getPropertyKeys().length; |
| } |
| |
| public Set entrySet() { |
| Set set = new HashSet(); |
| String[] keys = m_ref.getPropertyKeys(); |
| for (int i = 0; i < keys.length; i++) { |
| set.add(new ServicePropertiesMapEntry(keys[i], m_ref.getProperty(keys[i]))); |
| } |
| return set; |
| } |
| } |
| |
| // ----------------------- Public methods ----------------------------------------------------------- |
| |
| /** |
| * Creates a new service dependency. |
| * |
| * @param context the bundle context |
| * @param logger the logger |
| */ |
| public ServiceDependencyImpl(BundleContext context, Logger logger) { |
| super(logger); |
| m_context = context; |
| m_autoConfig = true; |
| m_serial = new SerialExecutor(logger); |
| } |
| |
| /** Copying constructor that clones an existing instance. */ |
| public ServiceDependencyImpl(ServiceDependencyImpl prototype) { |
| super(prototype); |
| m_serial = new SerialExecutor(m_logger); |
| synchronized (prototype) { |
| m_context = prototype.m_context; |
| m_autoConfig = prototype.m_autoConfig; |
| m_trackedServiceName = prototype.m_trackedServiceName; |
| m_nullObject = prototype.m_nullObject; |
| m_trackedServiceFilter = prototype.m_trackedServiceFilter; |
| m_trackedServiceFilterUnmodified = prototype.m_trackedServiceFilterUnmodified; |
| m_trackedServiceReference = prototype.m_trackedServiceReference; |
| m_callbackInstance = prototype.m_callbackInstance; |
| m_callbackAdded = prototype.m_callbackAdded; |
| m_callbackChanged = prototype.m_callbackChanged; |
| m_callbackRemoved = prototype.m_callbackRemoved; |
| m_callbackSwapped = prototype.m_callbackSwapped; |
| m_autoConfigInstance = prototype.m_autoConfigInstance; |
| m_defaultImplementation = prototype.m_defaultImplementation; |
| } |
| } |
| |
| //@Override |
| public ServiceDependency setDebug(String identifier) { |
| this.m_debug = true; |
| this.m_debugKey = identifier; |
| return this; |
| } |
| |
| //@Override |
| public Dependency createCopy() { |
| return new ServiceDependencyImpl(this); |
| } |
| |
| //@Override |
| public synchronized boolean isAutoConfig() { |
| return m_autoConfig; |
| } |
| |
| //@Override |
| public synchronized boolean isAvailable() { |
| return m_isAvailable; |
| } |
| |
| //@Override |
| public void start(final DependencyService service) { |
| m_serial.execute(new Runnable() { |
| public void run() { |
| // this code is executed exclusively and without holding any locks |
| doStart(service); |
| } |
| }); |
| } |
| |
| //@Override |
| public void stop(final DependencyService service) { |
| m_serial.execute(new Runnable() { |
| public void run() { |
| // this code is executed exclusively and without holding any locks |
| doStop(service); |
| } |
| }); |
| } |
| |
| //@Override |
| public Object addingService(ServiceReference ref) { |
| Object service = m_context.getService(ref); |
| // first check to make sure the service is actually an instance of our service |
| if (!m_trackedServiceName.isInstance(service)) { |
| return null; |
| } |
| return service; |
| } |
| |
| //@Override |
| public void addedService(final ServiceReference ref, final Object service) { |
| m_serial.execute(new Runnable() { |
| public void run() { |
| // this code is executed exclusively and without holding any locks |
| doAddedService(ref, service); |
| } |
| }); |
| } |
| |
| //@Override |
| public void modifiedService(final ServiceReference ref, final Object service) { |
| m_serial.execute(new Runnable() { |
| public void run() { |
| // this code is executed exclusively and without holding any locks |
| doModifiedService(ref, service); |
| } |
| }); |
| } |
| |
| //@Override |
| public void removedService(final ServiceReference ref, final Object service) { |
| m_serial.execute(new Runnable() { |
| public void run() { |
| // this code is executed exclusively and without holding any locks |
| doRemovedService(ref, service); |
| } |
| }); |
| } |
| |
| //@Override |
| public void invokeAdded(final DependencyService service) { |
| m_serial.execute(new Runnable() { |
| public void run() { |
| // this code is executed exclusively and without holding any locks |
| doInvokeAdded(service); |
| } |
| }); |
| } |
| |
| //@Override |
| public void invokeRemoved(final DependencyService service) { |
| m_serial.execute(new Runnable() { |
| public void run() { |
| // this code is executed exclusively and without holding any locks |
| doInvokeRemoved(service); |
| } |
| }); |
| } |
| |
| //@Override |
| public synchronized String toString() { |
| return "ServiceDependency[" + m_trackedServiceName + " " + m_trackedServiceFilterUnmodified + "]"; |
| } |
| |
| //@Override |
| public String getAutoConfigName() { |
| return m_autoConfigInstance; |
| } |
| |
| //@Override |
| public Object getAutoConfigInstance() { |
| return lookupService(); |
| } |
| |
| //@Override |
| public Class getAutoConfigType() { |
| return getInterface(); |
| } |
| |
| //@Override |
| public String getName() { |
| StringBuilder sb = new StringBuilder(); |
| if (m_trackedServiceName != null) { |
| sb.append(m_trackedServiceName.getName()); |
| if (m_trackedServiceFilterUnmodified != null) { |
| sb.append(' '); |
| sb.append(m_trackedServiceFilterUnmodified); |
| } |
| } |
| if (m_trackedServiceReference != null) { |
| sb.append("{service.id=" + m_trackedServiceReference.getProperty(Constants.SERVICE_ID) + "}"); |
| } |
| return sb.toString(); |
| } |
| |
| //@Override |
| public String getType() { |
| return "service"; |
| } |
| |
| //@Override |
| public Dictionary getProperties() { |
| ServiceReference reference = lookupServiceReference(); |
| Object service = lookupService(); |
| if (reference != null) { |
| if (m_propagateCallbackInstance != null && m_propagateCallbackMethod != null) { |
| try { |
| return (Dictionary) InvocationUtil.invokeCallbackMethod(m_propagateCallbackInstance, m_propagateCallbackMethod, |
| new Class[][]{{ServiceReference.class, Object.class}, {ServiceReference.class}}, new Object[][]{ |
| {reference, service}, {reference}}); |
| } catch (InvocationTargetException e) { |
| m_logger.log(LogService.LOG_WARNING, "Exception while invoking callback method", e.getCause()); |
| } catch (Exception e) { |
| m_logger.log(LogService.LOG_WARNING, "Exception while trying to invoke callback method", e); |
| } |
| throw new IllegalStateException("Could not invoke callback"); |
| } else { |
| Properties props = new Properties(); |
| String[] keys = reference.getPropertyKeys(); |
| for (int i = 0; i < keys.length; i++) { |
| if (!(keys[i].equals(Constants.SERVICE_ID) || keys[i].equals(Constants.SERVICE_PID))) { |
| props.put(keys[i], reference.getProperty(keys[i])); |
| } |
| } |
| return props; |
| } |
| } else { |
| throw new IllegalStateException("cannot find service reference"); |
| } |
| } |
| |
| //@Override |
| public boolean isPropagated() { |
| return m_propagate; |
| } |
| |
| // ----- CREATION |
| |
| /** |
| * Sets the name of the service that should be tracked. |
| * |
| * @param serviceName the name of the service |
| * @return this service dependency |
| */ |
| //@Override |
| public synchronized ServiceDependency setService(Class serviceName) { |
| setService(serviceName, null, null); |
| return this; |
| } |
| |
| /** |
| * Sets the name of the service that should be tracked. You can either specify |
| * only the name, only the filter, or the name and a filter. |
| * <p> |
| * If you specify name and filter, the filter is used |
| * to track the service and should only return services of the type that was specified |
| * in the name. To make sure of this, the filter is actually extended internally to |
| * filter on the correct name. |
| * <p> |
| * If you specify only the filter, the name is assumed to be a service of type |
| * <code>Object</code> which means that, when auto configuration is on, instances |
| * of that service will be injected in any field of type <code>Object</code>. |
| * |
| * @param serviceName the name of the service |
| * @param serviceFilter the filter condition |
| * @return this service dependency |
| */ |
| //@Override |
| public synchronized ServiceDependency setService(Class serviceName, String serviceFilter) { |
| setService(serviceName, null, serviceFilter); |
| return this; |
| } |
| |
| /** |
| * Sets the name of the service that should be tracked. The name is assumed to be |
| * a service of type <code>Object</code> which means that, when auto configuration |
| * is on, instances of that service will be injected in any field of type |
| * <code>Object</code>. |
| * |
| * @param serviceFilter the filter condition |
| * @return this service dependency |
| */ |
| //@Override |
| public synchronized ServiceDependency setService(String serviceFilter) { |
| if (serviceFilter == null) { |
| throw new IllegalArgumentException("Service filter cannot be null."); |
| } |
| setService(null, null, serviceFilter); |
| return this; |
| } |
| |
| /** |
| * Sets the name of the service that should be tracked. By specifying the service |
| * reference of the service you want to track, you can directly track a single |
| * service. The name you use must match the type of service referred to by the |
| * service reference and it is up to you to make sure that is the case. |
| * |
| * @param serviceName the name of the service |
| * @param serviceReference the service reference to track |
| * @return this service dependency |
| */ |
| //@Override |
| public synchronized ServiceDependency setService(Class serviceName, ServiceReference serviceReference) { |
| setService(serviceName, serviceReference, null); |
| return this; |
| } |
| |
| /** |
| * Sets the default implementation for this service dependency. You can use this to supply |
| * your own implementation that will be used instead of a Null Object when the dependency is |
| * not available. This is also convenient if the service dependency is not an interface |
| * (which would cause the Null Object creation to fail) but a class. |
| * |
| * @param implementation the instance to use or the class to instantiate if you want to lazily |
| * instantiate this implementation |
| * @return this service dependency |
| */ |
| //@Override |
| public synchronized ServiceDependency setDefaultImplementation(Object implementation) { |
| ensureNotActive(); |
| m_defaultImplementation = implementation; |
| return this; |
| } |
| |
| /** |
| * Sets the required flag which determines if this service is required or not. |
| * |
| * @param required the required flag |
| * @return this service dependency |
| */ |
| //@Override |
| public synchronized ServiceDependency setRequired(boolean required) { |
| ensureNotActive(); |
| setIsRequired(required); |
| return this; |
| } |
| |
| //@Override |
| public ServiceDependency setInstanceBound(boolean isInstanceBound) { |
| setIsInstanceBound(isInstanceBound); |
| return this; |
| } |
| |
| /** |
| * Sets auto configuration for this service. Auto configuration allows the |
| * dependency to fill in any attributes in the service implementation that |
| * are of the same type as this dependency. Default is on. |
| * |
| * @param autoConfig the value of auto config |
| * @return this service dependency |
| */ |
| //@Override |
| public synchronized ServiceDependency setAutoConfig(boolean autoConfig) { |
| ensureNotActive(); |
| m_autoConfig = autoConfig; |
| m_autoConfigInvoked = true; |
| return this; |
| } |
| |
| /** |
| * Sets auto configuration for this service. Auto configuration allows the |
| * dependency to fill in the attribute in the service implementation that |
| * has the same type and instance name. |
| * |
| * @param instanceName the name of attribute to auto config |
| * @return this service dependency |
| */ |
| //@Override |
| public synchronized ServiceDependency setAutoConfig(String instanceName) { |
| ensureNotActive(); |
| m_autoConfig = (instanceName != null); |
| m_autoConfigInstance = instanceName; |
| m_autoConfigInvoked = true; |
| return this; |
| } |
| |
| /** |
| * Sets the callbacks for this service. These callbacks can be used as hooks whenever a |
| * dependency is added or removed. When you specify callbacks, the auto configuration |
| * feature is automatically turned off, because we're assuming you don't need it in this |
| * case. |
| * |
| * @param added the method to call when a service was added |
| * @param removed the method to call when a service was removed |
| * @return this service dependency |
| */ |
| //@Override |
| public synchronized ServiceDependency setCallbacks(String added, String removed) { |
| return setCallbacks((Object) null, added, null, removed); |
| } |
| |
| /** |
| * Sets the callbacks for this service. These callbacks can be used as hooks whenever a |
| * dependency is added, changed or removed. When you specify callbacks, the auto |
| * configuration feature is automatically turned off, because we're assuming you don't |
| * need it in this case. |
| * |
| * @param added the method to call when a service was added |
| * @param changed the method to call when a service was changed |
| * @param removed the method to call when a service was removed |
| * @return this service dependency |
| */ |
| //@Override |
| public synchronized ServiceDependency setCallbacks(String added, String changed, String removed) { |
| return setCallbacks((Object) null, added, changed, removed); |
| } |
| |
| /** |
| * Sets the callbacks for this service. These callbacks can be used as hooks whenever a |
| * dependency is added, changed or removed. When you specify callbacks, the auto |
| * configuration feature is automatically turned off, because we're assuming you don't |
| * need it in this case. |
| * @param added the method to call when a service was added |
| * @param changed the method to call when a service was changed |
| * @param removed the method to call when a service was removed |
| * @param swapped the method to call when the service was swapped due to addition or |
| * removal of an aspect |
| * @return this service dependency |
| */ |
| //@Override |
| public synchronized ServiceDependency setCallbacks(String added, String changed, String removed, String swapped) { |
| return setCallbacks((Object) null, added, changed, removed, swapped); |
| } |
| |
| /** |
| * Sets the callbacks for this service. These callbacks can be used as hooks whenever a |
| * dependency is added or removed. They are called on the instance you provide. When you |
| * specify callbacks, the auto configuration feature is automatically turned off, because |
| * we're assuming you don't need it in this case. |
| * |
| * @param instance the instance to call the callbacks on |
| * @param added the method to call when a service was added |
| * @param removed the method to call when a service was removed |
| * @return this service dependency |
| */ |
| //@Override |
| public synchronized ServiceDependency setCallbacks(Object instance, String added, String removed) { |
| return setCallbacks(instance, added, (String) null, removed); |
| } |
| |
| /** |
| * Sets the callbacks for this service. These callbacks can be used as hooks whenever a |
| * dependency is added, changed or removed. They are called on the instance you provide. When you |
| * specify callbacks, the auto configuration feature is automatically turned off, because |
| * we're assuming you don't need it in this case. |
| * |
| * @param instance the instance to call the callbacks on |
| * @param added the method to call when a service was added |
| * @param changed the method to call when a service was changed |
| * @param removed the method to call when a service was removed |
| * @return this service dependency |
| */ |
| //@Override |
| public synchronized ServiceDependency setCallbacks(Object instance, String added, String changed, String removed) { |
| return setCallbacks(instance, added, changed, removed, null); |
| } |
| |
| /** |
| * Sets the callbacks for this service. These callbacks can be used as hooks whenever a |
| * dependency is added, changed or removed. When you specify callbacks, the auto |
| * configuration feature is automatically turned off, because we're assuming you don't |
| * need it in this case. |
| * @param instance the instance to call the callbacks on |
| * @param added the method to call when a service was added |
| * @param changed the method to call when a service was changed |
| * @param removed the method to call when a service was removed |
| * @param swapped the method to call when the service was swapped due to addition or |
| * removal of an aspect |
| * @return this service dependency |
| */ |
| //@Override |
| public synchronized ServiceDependency setCallbacks(Object instance, String added, String changed, String removed, String swapped) { |
| ensureNotActive(); |
| // if at least one valid callback is specified, we turn off auto configuration, unless |
| // someone already explicitly invoked autoConfig |
| if ((added != null || removed != null || changed != null || swapped != null) && !m_autoConfigInvoked) { |
| setAutoConfig(false); |
| } |
| m_callbackInstance = instance; |
| m_callbackAdded = added; |
| m_callbackChanged = changed; |
| m_callbackRemoved = removed; |
| m_callbackSwapped = swapped; |
| return this; |
| } |
| |
| //@Override |
| public ServiceDependency setPropagate(boolean propagate) { |
| ensureNotActive(); |
| m_propagate = propagate; |
| return this; |
| } |
| |
| //@Override |
| public ServiceDependency setPropagate(Object instance, String method) { |
| setPropagate(instance != null && method != null); |
| m_propagateCallbackInstance = instance; |
| m_propagateCallbackMethod = method; |
| return this; |
| } |
| |
| public void invoke(Object[] callbackInstances, DependencyService dependencyService, ServiceReference reference, Object service, String name) { |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] invoke: " + name); |
| } |
| if (name != null) { |
| dependencyService.invokeCallbackMethod(callbackInstances, name, new Class[][]{ |
| {Component.class, ServiceReference.class, m_trackedServiceName}, |
| {Component.class, ServiceReference.class, Object.class}, {Component.class, ServiceReference.class}, |
| {Component.class, m_trackedServiceName}, {Component.class, Object.class}, {Component.class}, |
| {Component.class, Map.class, m_trackedServiceName}, {ServiceReference.class, m_trackedServiceName}, |
| {ServiceReference.class, Object.class}, {ServiceReference.class}, {m_trackedServiceName}, {Object.class}, {}, |
| {Map.class, m_trackedServiceName}}, new Object[][]{{dependencyService, reference, service}, |
| {dependencyService, reference, service}, {dependencyService, reference}, {dependencyService, service}, |
| {dependencyService, service}, {dependencyService}, {dependencyService, new ServicePropertiesMap(reference), service}, |
| {reference, service}, {reference, service}, {reference}, {service}, {service}, {}, |
| {new ServicePropertiesMap(reference), service}}); |
| } |
| } |
| |
| public void invokeSwappedCallback(Object[] callbackInstances, DependencyService component, ServiceReference previousReference, Object previous, |
| ServiceReference currentServiceReference, Object current, String swapCallback) { |
| // sanity check on the service references |
| Integer oldRank = (Integer) previousReference.getProperty(Constants.SERVICE_RANKING); |
| Integer newRank = (Integer) currentServiceReference.getProperty(Constants.SERVICE_RANKING); |
| |
| if (oldRank != null && newRank != null && oldRank.equals(newRank)) { |
| throw new IllegalStateException("Attempt to swap a service for a service with the same rank! previousReference: " |
| + previousReference + ", currentReference: " + currentServiceReference); |
| } |
| |
| component.invokeCallbackMethod(callbackInstances, swapCallback, new Class[][]{ |
| {m_trackedServiceName, m_trackedServiceName}, {Object.class, Object.class}, |
| {ServiceReference.class, m_trackedServiceName, ServiceReference.class, m_trackedServiceName}, |
| {ServiceReference.class, Object.class, ServiceReference.class, Object.class}, |
| {Component.class, m_trackedServiceName, m_trackedServiceName}, {Component.class, Object.class, Object.class}, |
| {Component.class, ServiceReference.class, m_trackedServiceName, ServiceReference.class, m_trackedServiceName}, |
| {Component.class, ServiceReference.class, Object.class, ServiceReference.class, Object.class}}, new Object[][]{ |
| {previous, current}, {previous, current}, {previousReference, previous, currentServiceReference, current}, |
| {previousReference, previous, currentServiceReference, current}, {component, previous, current}, |
| {component, previous, current}, {component, previousReference, previous, currentServiceReference, current}, |
| {component, previousReference, previous, currentServiceReference, current}}); |
| } |
| |
| // --------------------------------------- Protected methods ------------------------------------------------------------------- |
| |
| protected synchronized boolean makeAvailable() { |
| if (!isAvailable()) { |
| m_isAvailable = true; |
| return true; |
| } |
| return false; |
| } |
| |
| protected synchronized Object getService() { |
| Object service = null; |
| if (m_isStarted) { |
| service = m_tracker.getService(); |
| } |
| if (service == null && isAutoConfig()) { |
| service = getDefaultImplementation(); |
| if (service == null) { |
| service = getNullObject(); |
| } |
| } |
| return service; |
| } |
| |
| // --------------------------------------- Private methods -------------------------------------------- |
| |
| private void doStart(DependencyService service) { |
| boolean needsStarting = false; |
| synchronized (this) { |
| m_services.add(service); |
| if (!m_isStarted) { |
| if (m_trackedServiceName != null) { |
| if (m_trackedServiceFilter != null) { |
| try { |
| m_tracker = new ServiceTracker(m_context, m_context.createFilter(m_trackedServiceFilter), this); |
| } catch (InvalidSyntaxException e) { |
| throw new IllegalStateException("Invalid filter definition for dependency: " + m_trackedServiceFilter); |
| } |
| } else if (m_trackedServiceReference != null) { |
| m_tracker = new ServiceTracker(m_context, m_trackedServiceReference, this); |
| } else { |
| m_tracker = new ServiceTracker(m_context, m_trackedServiceName.getName(), this); |
| } |
| } else { |
| throw new IllegalStateException("Could not create tracker for dependency, no service name specified."); |
| } |
| m_isStarted = true; |
| needsStarting = true; |
| } |
| } |
| if (needsStarting) { |
| // when the swapped callback is set, also track the aspects |
| boolean trackAllServices = false; |
| boolean trackAllAspects = false; |
| if (m_callbackSwapped != null) { |
| trackAllAspects = true; |
| } |
| m_tracker.open(trackAllServices, trackAllAspects); |
| } |
| } |
| |
| private void doStop(DependencyService service) { |
| boolean needsStopping = false; |
| synchronized (this) { |
| if (m_services.size() == 1 && m_services.contains(service)) { |
| m_isStarted = false; |
| needsStopping = true; |
| } |
| } |
| if (needsStopping) { |
| m_tracker.close(); |
| m_tracker = null; |
| } |
| //moved this down |
| synchronized (this) { |
| m_services.remove(service); |
| } |
| } |
| |
| private void doAddedService(ServiceReference ref, Object service) { |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] addedservice: " + ref); |
| } |
| boolean makeAvailable = makeAvailable(); |
| |
| Object[] services; |
| synchronized (this) { |
| services = m_services.toArray(); |
| } |
| for (int i = 0; i < services.length; i++) { |
| DependencyService ds = (DependencyService) services[i]; |
| if (makeAvailable) { |
| if (ds.isInstantiated() && isInstanceBound() && isRequired()) { |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] invoke added: " + ref); |
| } |
| invokeAdded(ds, ref, service); |
| } |
| // The dependency callback will be deferred until all required dependency are available. |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] dependency available: " + ref); |
| } |
| ds.dependencyAvailable(this); //** |
| if (!isRequired()) { |
| // For optional dependency, we always invoke callback, because at this point, we know |
| // that the service has been started, and the service start method has been called. |
| // (See the ServiceImpl.bindService method, which will activate optional dependencies using |
| // startTrackingOptional() method). |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] invoke added: " + ref); |
| } |
| invokeAdded(ds, ref, service); |
| } |
| } else { |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] dependency added (was available): " + ref); |
| } |
| // First, inject the added service in autoconfig field, if any. |
| ds.autoConfig(this); |
| |
| // At this point, either the dependency is optional (meaning that the service has been started, |
| // because if not, then our dependency would not be active); or the dependency is required, |
| // meaning that either the service is not yet started, or already started. |
| // In all cases, we have to inject the required dependency. |
| // we only try to invoke the method here if we are really already instantiated |
| if (ds.isInstantiated() && ds.getCompositionInstances().length > 0) { |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] invoke added: " + ref); |
| } |
| if (invokeAdded(ds, ref, service)) { |
| // Propagate (if needed) all "setPropagate" dependencies to the dependency service. |
| ds.propagate(this); |
| } |
| } |
| } |
| } |
| } |
| |
| private void doModifiedService(ServiceReference ref, Object service) { |
| Object[] services; |
| synchronized (this) { |
| services = m_services.toArray(); |
| } |
| for (int i = 0; i < services.length; i++) { |
| DependencyService ds = (DependencyService) services[i]; |
| ds.autoConfig(this); |
| if (ds.isInstantiated()) { |
| if (invokeChanged(ds, ref, service)) { |
| // The "change" or "swap" callback has been invoked (if not it means that the modified service |
| // is for a lower ranked aspect to which we are not interested in). |
| // Now, propagate (if needed) changed properties to dependency service properties. |
| ds.propagate(this); |
| } |
| } |
| } |
| } |
| |
| private void doRemovedService(ServiceReference ref, Object service) { |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] removedService: " + ref + ", rank: " + ref.getProperty("service.ranking")); |
| } |
| boolean makeUnavailable = makeUnavailable(); |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] make unavailable: " + makeUnavailable); |
| } |
| Object[] services; |
| synchronized (this) { |
| services = m_services.toArray(); |
| } |
| |
| for (int i = 0; i < services.length; i++) { |
| DependencyService ds = (DependencyService) services[i]; |
| if (makeUnavailable) { |
| ds.dependencyUnavailable(this); |
| // when the dependency is optional or the dependency is instance bound and the component is instantiated (and the dependency is required) |
| // then remove is invoked. In other cases the removed has been when the component was unconfigured. |
| if (!isRequired() || (ds.isInstantiated() && isInstanceBound())) { |
| invokeRemoved(ds, ref, service); |
| } |
| } else { |
| // Some dependencies are still available: first inject the remaining highest ranked dependency |
| // in component class field, if the dependency is configured in autoconfig mode. |
| ds.autoConfig(this); |
| // Next, invoke "removed" callback. If the dependency is aspect aware, we only invoke removed cb |
| // if the removed service is the highest ranked service. Note that if the cb is not called, we don't |
| // propagate the remaining dependency properties. |
| if (invokeRemoved(ds, ref, service)) { |
| // Finally, since we have lost one dependency, we have to possibly propagate the highest ranked |
| // dependency available. |
| ds.propagate(this); |
| } |
| } |
| } |
| // unget what we got in addingService (see ServiceTracker 701.4.1) |
| m_context.ungetService(ref); |
| |
| } |
| |
| private void doInvokeAdded(DependencyService service) { |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] invoke added due to configure. (component is activated)"); |
| } |
| ServiceReference[] refs = m_tracker.getServiceReferences(); |
| if (refs != null) { |
| for (int i = 0; i < refs.length; i++) { |
| ServiceReference sr = refs[i]; |
| Object svc = m_context.getService(sr); |
| invokeAdded(service, sr, svc); |
| } |
| } |
| } |
| |
| private void doInvokeRemoved(DependencyService service) { |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] invoke removed due to unconfigure. (component is destroyed)"); |
| } |
| Set references = null; |
| Object[] tupleArray = null; |
| synchronized (m_sr) { |
| references = (Set) m_sr.get(service); |
| // is this null check necessary ?? |
| if (references != null) { |
| tupleArray = references.toArray(new Tuple[references.size()]); |
| } |
| } |
| |
| Tuple[] refs = (Tuple[]) (tupleArray != null ? tupleArray : new Tuple[0]); |
| |
| for (int i = 0; i < refs.length; i++) { |
| ServiceReference sr = refs[i].getServiceReference(); |
| Object svc = refs[i].getService(); |
| invokeRemoved(service, sr, svc); |
| } |
| } |
| |
| private Object lookupService() { |
| Object service = null; |
| if (m_isStarted) { |
| service = getService(); |
| } else { |
| ServiceReference[] refs = null; |
| ServiceReference ref = null; |
| if (m_trackedServiceName != null) { |
| if (m_trackedServiceFilter != null) { |
| try { |
| refs = m_context.getServiceReferences(m_trackedServiceName.getName(), m_trackedServiceFilter); |
| if (refs != null) { |
| Arrays.sort(refs, COMPARATOR); |
| ref = refs[0]; |
| } |
| } catch (InvalidSyntaxException e) { |
| throw new IllegalStateException("Invalid filter definition for dependency."); |
| } |
| } else if (m_trackedServiceReference != null) { |
| ref = m_trackedServiceReference; |
| } else { |
| ref = m_context.getServiceReference(m_trackedServiceName.getName()); |
| } |
| if (ref != null) { |
| service = m_context.getService(ref); |
| } |
| } else { |
| throw new IllegalStateException("Could not lookup dependency, no service name specified."); |
| } |
| } |
| if (service == null && isAutoConfig()) { |
| service = getDefaultImplementation(); |
| if (service == null) { |
| service = getNullObject(); |
| } |
| } |
| return service; |
| } |
| |
| private ServiceReference lookupServiceReference() { |
| // TODO lots of duplication in lookupService() |
| ServiceReference service = null; |
| if (m_isStarted) { |
| service = m_tracker.getServiceReference(); |
| } else { |
| ServiceReference[] refs = null; |
| ServiceReference ref = null; |
| if (m_trackedServiceName != null) { |
| if (m_trackedServiceFilter != null) { |
| try { |
| refs = m_context.getServiceReferences(m_trackedServiceName.getName(), m_trackedServiceFilter); |
| if (refs != null) { |
| Arrays.sort(refs, COMPARATOR); |
| ref = refs[0]; |
| } |
| } catch (InvalidSyntaxException e) { |
| throw new IllegalStateException("Invalid filter definition for dependency."); |
| } |
| } else if (m_trackedServiceReference != null) { |
| ref = m_trackedServiceReference; |
| } else { |
| ref = m_context.getServiceReference(m_trackedServiceName.getName()); |
| } |
| if (ref != null) { |
| service = ref; |
| } |
| } else { |
| throw new IllegalStateException("Could not lookup dependency, no service name specified."); |
| } |
| } |
| return service; |
| } |
| |
| private synchronized Class getInterface() { |
| return m_trackedServiceName; |
| } |
| |
| private Object getNullObject() { |
| if (m_nullObject == null) { |
| Class trackedServiceName; |
| synchronized (this) { |
| trackedServiceName = m_trackedServiceName; |
| } |
| try { |
| m_nullObject = Proxy.newProxyInstance(trackedServiceName.getClassLoader(), new Class[]{trackedServiceName}, |
| new DefaultNullObject()); |
| } catch (Exception e) { |
| m_logger.log(Logger.LOG_ERROR, "Could not create null object for " + trackedServiceName + ".", e); |
| } |
| } |
| return m_nullObject; |
| } |
| |
| private Object getDefaultImplementation() { |
| if (m_defaultImplementation != null) { |
| if (m_defaultImplementation instanceof Class) { |
| try { |
| m_defaultImplementationInstance = ((Class) m_defaultImplementation).newInstance(); |
| } catch (Exception e) { |
| m_logger.log(Logger.LOG_ERROR, "Could not create default implementation instance of class " + m_defaultImplementation |
| + ".", e); |
| } |
| } else { |
| m_defaultImplementationInstance = m_defaultImplementation; |
| } |
| } |
| return m_defaultImplementationInstance; |
| } |
| |
| /** |
| * Invoke added or swap callback. |
| * @return true if one of the swap/added callbacks has been invoked, false if not, meaning that the added dependency is not the highest ranked one. |
| */ |
| private boolean invokeAdded(DependencyService dependencyService, ServiceReference reference, Object service) { |
| // We are already serialized. |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] invoke added"); |
| } |
| boolean added = false; |
| synchronized (m_sr) { |
| Set set = (Set) m_sr.get(dependencyService); |
| if (set == null) { |
| set = new HashSet(); |
| m_sr.put(dependencyService, set); |
| } |
| added = set.add(new Tuple(reference, service)); |
| } |
| if (added) { |
| // when a changed callback is specified we might not call the added callback just yet |
| if (m_callbackSwapped != null) { |
| return handleAspectAwareAdded(dependencyService, reference, service); |
| } else { |
| invoke(dependencyService, reference, service, m_callbackAdded); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private boolean invokeChanged(DependencyService dependencyService, ServiceReference reference, Object service) { |
| if (m_callbackSwapped != null) { |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] handleAspectAwareChanged on " + service); |
| } |
| return handleAspectAwareChanged(dependencyService, reference, service); |
| } |
| invoke(dependencyService, reference, service, m_callbackChanged); |
| return true; |
| } |
| |
| /* |
| * Invoke the removed or the swap callback. |
| * @return true if the swap or the removed callback has been called, false if not. |
| */ |
| private boolean invokeRemoved(DependencyService dependencyService, ServiceReference reference, Object service) { |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] invoke removed"); |
| } |
| boolean removed = false; |
| synchronized (m_sr) { |
| Set set = (Set) m_sr.get(dependencyService); |
| removed = (set != null && set.remove(new Tuple(reference, service))); |
| } |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] removed: " + removed); |
| } |
| if (removed) { |
| if (m_callbackSwapped != null) { |
| return handleAspectAwareRemoved(dependencyService, reference, service); |
| } else { |
| invoke(dependencyService, reference, service, m_callbackRemoved); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private void invoke(DependencyService dependencyService, ServiceReference reference, Object service, String name) { |
| invoke(getCallbackInstances(dependencyService), dependencyService, reference, service, name); |
| } |
| |
| /** |
| * Invoke added or swap callback for aspect aware service dependency. |
| * @return true if one of the swap/added callbacks has been invoked, false if not, meaning that the added dependency is not the highest ranked one. |
| */ |
| private boolean handleAspectAwareAdded(final DependencyService dependencyService, final ServiceReference reference, final Object service) { |
| // At this point, we are already serialized: no need to synchronized. |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] aspectawareadded: " + reference.getProperty("service.ranking")); |
| } |
| if (componentIsDependencyManagerFactory(dependencyService)) { |
| // component is either aspect or adapter factory instance, these must be ignored. |
| return false; |
| } |
| boolean invokeAdded = false; |
| boolean invokeSwapped = false; |
| Integer ranking = ServiceUtil.getRankingAsInteger(reference); |
| Tuple newHighestRankedService = null; |
| Tuple prevHighestRankedService = null; |
| Map rankings = null; |
| |
| Long originalServiceId = ServiceUtil.getServiceIdAsLong(reference); |
| Map componentMap = (Map) m_componentByRank.get(dependencyService); /* <Long, Map<Integer, Tuple>> */ |
| if (componentMap == null) { |
| // create new componentMap |
| componentMap = new HashMap(); /* <Long, Map<Integer, Tuple>> */ |
| m_componentByRank.put(dependencyService, componentMap); |
| } |
| rankings = (Map) componentMap.get(originalServiceId); /* <Integer, Tuple> */ |
| if (rankings == null) { |
| // new component added |
| rankings = new HashMap(); /* <Integer, Tuple> */ |
| componentMap.put(originalServiceId, rankings); |
| rankings.put(ranking, new Tuple(reference, service)); |
| invokeAdded = true; |
| } |
| |
| if (!invokeAdded) { |
| // current highest ranked |
| prevHighestRankedService = (Tuple) getHighestRankedService(dependencyService, originalServiceId).getValue(); |
| newHighestRankedService = swapHighestRankedService(dependencyService, originalServiceId, reference, service, ranking); |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] prevhigh: " + prevHighestRankedService.getServiceReference().getProperty("service.ranking") + ", new high: " + |
| newHighestRankedService.getServiceReference().getProperty("service.ranking")); |
| } |
| if (!prevHighestRankedService.getServiceReference().equals(newHighestRankedService.getServiceReference())) { |
| // new highest ranked service |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] New highest ranked to swap to"); |
| } |
| invokeSwapped = true; |
| } else { |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] Ignoring lower ranked or irrelevant swap"); |
| } |
| } |
| } |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] " + m_componentByRank.toString()); |
| } |
| |
| // up until this point should be synchronized on m_componentsByRank to keep integrity of the administration and consequences |
| // then the do phase comes, here we want to guarantee the effects of this operation are done like they were synchronized, however |
| // synchronization on m_componentsByRank to too course grained here, so we'd like to switch to synchronization on the |
| // original service id, therefore we're using our own guarded block to ensure the correct order. |
| |
| if (invokeAdded) { |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] invoke added: " + reference.getProperty("service.ranking")); |
| } |
| // We can safely invoke callback since we are already serialized. |
| invoke(dependencyService, reference, service, m_callbackAdded); |
| return true; |
| } else if (invokeSwapped) { |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] invoke swapped: " + newHighestRankedService.getServiceReference().getProperty("service.ranking") + " replacing " + |
| prevHighestRankedService.getServiceReference().getProperty("service.ranking")); |
| } |
| // We can safely invoke callback since we are already serialized. |
| invokeSwappedCallback(dependencyService, prevHighestRankedService.getServiceReference(), prevHighestRankedService.getService(), |
| newHighestRankedService.getServiceReference(), newHighestRankedService.getService()); |
| return true; |
| } |
| return false; |
| } |
| |
| private boolean componentIsDependencyManagerFactory(DependencyService dependencyService) { |
| Object component = dependencyService.getService(); |
| if (component != null) { |
| String className = component.getClass().getName(); |
| return className.startsWith("org.apache.felix.dm") |
| && !className.startsWith("org.apache.felix.dm.impl.AdapterServiceImpl$AdapterImpl") |
| && !className.startsWith("org.apache.felix.dm.test"); |
| } |
| return false; |
| } |
| |
| private Tuple swapHighestRankedService(DependencyService dependencyService, Long serviceId, ServiceReference newReference, |
| Object newService, Integer newRanking) { |
| // does a component with a higher ranking exist |
| synchronized (m_componentByRank) { |
| Map componentMap = (Map) m_componentByRank.get(dependencyService); /* <Long, Map<Integer, Tuple>> */ |
| Map rankings = (Map) componentMap.get(serviceId); /* <Integer, Tuple> */ |
| rankings.put(newRanking, new Tuple(newReference, newService)); |
| Entry highestEntry = getHighestRankedService(dependencyService, serviceId); /* <Integer, Tuple> */ |
| return (Tuple) highestEntry.getValue(); |
| } |
| } |
| |
| private Entry getHighestRankedService(DependencyService dependencyService, Long serviceId) { /* <Integer, Tuple> */ |
| Entry highestEntry = null; /* <Integer, Tuple> */ |
| Map componentMap = (Map) m_componentByRank.get(dependencyService); /* <Long, Map<Integer, Tuple>> */ |
| Map rankings = (Map) componentMap.get(serviceId); /* <Integer, Tuple> */ |
| if (rankings != null) { |
| for (Iterator entryIterator = rankings.entrySet().iterator(); entryIterator.hasNext();) { /* <Integer, Tuple> */ |
| Entry mapEntry = (Entry) entryIterator.next(); |
| if (highestEntry == null) { |
| highestEntry = mapEntry; |
| } else { |
| if (((Integer) mapEntry.getKey()).intValue() > ((Integer) highestEntry.getKey()).intValue()) { |
| highestEntry = mapEntry; |
| } |
| } |
| } |
| } |
| return highestEntry; |
| } |
| |
| private boolean isLastService(DependencyService dependencyService, ServiceReference reference, Object object, Long serviceId) { |
| // get the collection of rankings |
| Map componentMap = (Map) m_componentByRank.get(dependencyService); /* <Long, Map<Integer, Tuple>> */ |
| |
| Map rankings = null; /* <Integer, Tuple> */ |
| if (componentMap != null) { |
| rankings = (Map) componentMap.get(serviceId); |
| } |
| // if there is only one element left in the collection of rankings |
| // and this last element has the same ranking as the supplied service (in other words, it is the same) |
| // then this is the last service |
| // NOTE: it is possible that there is only one element, but that it's not equal to the supplied service, |
| // because an aspect on top of the original service is being removed (but the original service is still |
| // there). That in turn triggers: |
| // 1) a call to added(original-service) |
| // 2) that causes a swap |
| // 3) a call to removed(aspect-service) <-- that's what we're talking about |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] last service: " + m_componentByRank.toString()); |
| } |
| return (componentMap != null && rankings != null && rankings.size() == 1 && ((Entry) rankings.entrySet().iterator().next()) |
| .getKey().equals(ServiceUtil.getRankingAsInteger(reference))); |
| } |
| |
| private boolean handleAspectAwareChanged(DependencyService dependencyService, ServiceReference reference, Object service) { |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] aspectawareChanged: service.ranking=" + reference.getProperty("service.ranking")); |
| } |
| if (componentIsDependencyManagerFactory(dependencyService)) { |
| // component is either aspect or adapter factory instance, these must be ignored. |
| return false; |
| } |
| boolean invokeChanged = false; |
| |
| // Determine current highest ranked service: we'll take into account the change event only if it |
| // comes from the highest ranked service. |
| Long serviceId = ServiceUtil.getServiceIdAsLong(reference); |
| Map componentMap = (Map) m_componentByRank.get(dependencyService); /* <Long, Map<Integer, Tuple>> */ |
| if (componentMap != null) { |
| Map rankings = (Map) componentMap.get(serviceId); /* <Integer, Tuple> */ |
| if (rankings != null) { |
| Entry highestEntry = getHighestRankedService(dependencyService, serviceId); /* <Integer, Tuple> */ |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] highest service ref:" + highestEntry); |
| } |
| if (highestEntry == null) { |
| invokeChanged = true; |
| } else { |
| Tuple tuple = (Tuple) highestEntry.getValue(); |
| if (reference.equals(tuple.getServiceReference())) { |
| // The changed service is the highest ranked service: we can handle the modification event. |
| invokeChanged = true; |
| } |
| } |
| } |
| } |
| |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] invokeChanged=" + invokeChanged); |
| } |
| |
| if (invokeChanged) { |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] invoke changed: ref ranking=" + reference.getProperty("service.ranking")); |
| } |
| invoke(dependencyService, reference, service, m_callbackChanged); |
| return true; |
| } |
| return false; |
| } |
| |
| /* |
| * handles aspect aware removed service. |
| * @return true if the swap or the removed callback has been called, false if not. |
| */ |
| private boolean handleAspectAwareRemoved(DependencyService dependencyService, ServiceReference reference, Object service) { |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] aspectawareremoved: " + reference.getProperty("service.ranking")); |
| } |
| if (componentIsDependencyManagerFactory(dependencyService)) { |
| // component is either aspect or adapter factory instance, these must be ignored. |
| return false; |
| } |
| // we might need to swap here too! |
| boolean invokeRemoved = false; |
| Long serviceId = ServiceUtil.getServiceIdAsLong(reference); |
| Tuple prevHighestRankedService = null; |
| Tuple newHighestRankedService = null; |
| boolean invokeSwapped = false; |
| Map rankings = null; |
| Long originalServiceId = ServiceUtil.getServiceIdAsLong(reference); |
| |
| if (isLastService(dependencyService, reference, service, serviceId)) { |
| invokeRemoved = true; |
| } else { |
| // not the last service, but should we swap? |
| prevHighestRankedService = (Tuple) getHighestRankedService(dependencyService, originalServiceId).getValue(); |
| if (prevHighestRankedService.getServiceReference().equals(reference)) { |
| // swapping out |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] Swap out on remove!"); |
| } |
| invokeSwapped = true; |
| } |
| } |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] is last service: " + invokeRemoved); |
| } |
| // cleanup |
| Map componentMap = (Map) m_componentByRank.get(dependencyService); /* <Long, Map<Integer, Tuple>> */ |
| if (componentMap != null) { |
| rankings = (Map) componentMap.get(originalServiceId); /* <Integer, Tuple> */ |
| List rankingsToRemove = new ArrayList(); |
| for (Iterator entryIterator = rankings.entrySet().iterator(); entryIterator.hasNext();) { |
| Entry mapEntry = (Entry) entryIterator.next(); |
| if (((Tuple) mapEntry.getValue()).getServiceReference().equals(reference)) { |
| // remove the reference |
| // rankings.remove(mapEntry.getKey()); |
| rankingsToRemove.add(mapEntry.getKey()); |
| } |
| } |
| for (Iterator rankingIterator = rankingsToRemove.iterator(); rankingIterator.hasNext();) { |
| rankings.remove(rankingIterator.next()); |
| } |
| if (rankings.size() == 0) { |
| componentMap.remove(originalServiceId); |
| } |
| if (componentMap.size() == 0) { |
| m_componentByRank.remove(dependencyService); |
| } |
| } |
| // determine current highest ranked service |
| if (invokeSwapped) { |
| newHighestRankedService = (Tuple) getHighestRankedService(dependencyService, originalServiceId).getValue(); |
| } |
| if (invokeRemoved) { |
| // handle invoke outside the sync block since we won't know what will happen there |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] invoke removed: " + reference.getProperty("service.ranking")); |
| } |
| // We can safely invoke callback, since we are already serialized |
| invoke(dependencyService, reference, service, m_callbackRemoved); |
| return true; |
| } else if (invokeSwapped) { |
| if (m_debug) { |
| m_logger.log(Logger.LOG_DEBUG, "[" + m_debugKey + "] invoke swapped: " + newHighestRankedService.getServiceReference().getProperty("service.ranking") + " replacing " + |
| prevHighestRankedService.getServiceReference().getProperty("service.ranking")); |
| } |
| // We can safely invoke callback, since we are already serialized |
| invokeSwappedCallback(dependencyService, prevHighestRankedService.getServiceReference(), prevHighestRankedService.getService(), |
| newHighestRankedService.getServiceReference(), newHighestRankedService.getService()); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| private void invokeSwappedCallback(DependencyService component, ServiceReference previousReference, Object previous, |
| ServiceReference currentServiceReference, Object current) { |
| invokeSwappedCallback(getCallbackInstances(component), component, previousReference, previous, currentServiceReference, current, m_callbackSwapped); |
| } |
| |
| private synchronized boolean makeUnavailable() { |
| // TODO should we check also m_isStarted ? |
| if ((isAvailable()) && (m_isStarted == false || !m_tracker.hasReference())) { |
| m_isAvailable = false; |
| return true; |
| } |
| return false; |
| } |
| |
| private synchronized Object[] getCallbackInstances(DependencyService dependencyService) { |
| if (m_callbackInstance == null) { |
| return dependencyService.getCompositionInstances(); |
| } else { |
| return new Object[]{m_callbackInstance}; |
| } |
| } |
| |
| // ----- CREATION |
| |
| /** Internal method to set the name, service reference and/or filter. */ |
| private void setService(Class serviceName, ServiceReference serviceReference, String serviceFilter) { |
| ensureNotActive(); |
| if (serviceName == null) { |
| m_trackedServiceName = Object.class; |
| } else { |
| m_trackedServiceName = serviceName; |
| } |
| if (serviceFilter != null) { |
| m_trackedServiceFilterUnmodified = serviceFilter; |
| if (serviceName == null) { |
| m_trackedServiceFilter = serviceFilter; |
| } else { |
| m_trackedServiceFilter = "(&(" + Constants.OBJECTCLASS + "=" + serviceName.getName() + ")" + serviceFilter + ")"; |
| } |
| } else { |
| m_trackedServiceFilterUnmodified = null; |
| m_trackedServiceFilter = null; |
| } |
| if (serviceReference != null) { |
| m_trackedServiceReference = serviceReference; |
| if (serviceFilter != null) { |
| throw new IllegalArgumentException("Cannot specify both a filter and a service reference."); |
| } |
| } else { |
| m_trackedServiceReference = null; |
| } |
| } |
| |
| private void ensureNotActive() { |
| if (m_tracker != null) { |
| throw new IllegalStateException("Cannot modify state while active."); |
| } |
| } |
| } |