| /* |
| * 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.List; |
| import java.util.Map; |
| 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.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 List m_services = new ArrayList(); |
| protected volatile ServiceTracker m_tracker; |
| protected BundleContext m_context; |
| protected volatile Class m_trackedServiceName; |
| private Object m_nullObject; |
| private volatile String m_trackedServiceFilter; |
| private volatile String m_trackedServiceFilterUnmodified; |
| private volatile ServiceReference m_trackedServiceReference; |
| private volatile boolean m_isStarted; |
| private Object m_callbackInstance; |
| private String m_callbackAdded; |
| private String m_callbackChanged; |
| private String m_callbackRemoved; |
| private boolean m_autoConfig; |
| protected ServiceReference m_reference; |
| protected Object m_serviceInstance; |
| private String m_autoConfigInstance; |
| private boolean m_autoConfigInvoked; |
| private Object m_defaultImplementation; |
| private Object m_defaultImplementationInstance; |
| private boolean m_isAvailable; |
| private boolean m_propagate; |
| private Object m_propagateCallbackInstance; |
| private String m_propagateCallbackMethod; |
| private final Map m_sr = new HashMap(); /* <DependencyService, Set<Tuple<ServiceReference, Object>> */ |
| |
| 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(); |
| } |
| } |
| |
| /** |
| * 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; |
| } |
| } |
| |
| /** |
| * 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; |
| } |
| |
| /** Copying constructor that clones an existing instance. */ |
| public ServiceDependencyImpl(ServiceDependencyImpl prototype) { |
| super(prototype); |
| 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_autoConfigInstance = prototype.m_autoConfigInstance; |
| m_defaultImplementation = prototype.m_defaultImplementation; |
| } |
| } |
| |
| public Dependency createCopy() { |
| return new ServiceDependencyImpl(this); |
| } |
| |
| public synchronized boolean isAutoConfig() { |
| return m_autoConfig; |
| } |
| |
| public synchronized boolean isAvailable() { |
| return m_isAvailable; |
| } |
| |
| public 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; |
| } |
| |
| public 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; |
| } |
| |
| // TODO lots of duplication in lookupService() |
| public ServiceReference lookupServiceReference() { |
| 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 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; |
| } |
| |
| public synchronized Class getInterface() { |
| return m_trackedServiceName; |
| } |
| |
| public void start(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) { |
| m_tracker.open(); |
| } |
| } |
| |
| public void stop(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); |
| } |
| } |
| |
| 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; |
| } |
| |
| public void addedService(ServiceReference ref, Object service) { |
| 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()) { |
| invokeAdded(ds, ref, service); |
| } |
| // The dependency callback will be defered until all required dependency are available. |
| 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). |
| invokeAdded(ds, ref, service); |
| } |
| } |
| else { |
| ds.dependencyChanged(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) { |
| invokeAdded(ds, ref, service); |
| } |
| } |
| } |
| } |
| |
| public void modifiedService(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.dependencyChanged(this); |
| if (ds.isRegistered()) { |
| invokeChanged(ds, ref, service); |
| } |
| } |
| } |
| |
| public void removedService(ServiceReference ref, Object service) { |
| boolean makeUnavailable = 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); |
| if (!isRequired() || (ds.isInstantiated() && isInstanceBound())) { |
| invokeRemoved(ds, ref, service); |
| } |
| } |
| else { |
| ds.dependencyChanged(this); |
| invokeRemoved(ds, ref, service); |
| } |
| } |
| // unget what we got in addingService (see ServiceTracker 701.4.1) |
| m_context.ungetService(ref); |
| |
| } |
| |
| public void invokeAdded(DependencyService dependencyService, ServiceReference reference, Object service) { |
| 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) { |
| invoke(dependencyService, reference, service, m_callbackAdded); |
| } |
| } |
| |
| public void invokeChanged(DependencyService dependencyService, ServiceReference reference, Object service) { |
| invoke(dependencyService, reference, service, m_callbackChanged); |
| } |
| |
| public void invokeRemoved(DependencyService dependencyService, ServiceReference reference, Object service) { |
| boolean removed = false; |
| synchronized (m_sr) { |
| Set set = (Set) m_sr.get(dependencyService); |
| removed = (set != null && set.remove(new Tuple(reference, service))); |
| } |
| if (removed) { |
| invoke(dependencyService, reference, service, m_callbackRemoved); |
| } |
| } |
| |
| public void invoke(DependencyService dependencyService, ServiceReference reference, Object service, String name) { |
| if (name != null) { |
| dependencyService.invokeCallbackMethod(getCallbackInstances(dependencyService), 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} |
| } |
| ); |
| } |
| } |
| |
| protected synchronized boolean makeAvailable() { |
| if (!isAvailable()) { |
| m_isAvailable = true; |
| return true; |
| } |
| return false; |
| } |
| |
| private synchronized boolean makeUnavailable() { |
| if ((isAvailable()) && (m_tracker.getServiceReference() == null)) { |
| 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 |
| |
| /** |
| * Sets the name of the service that should be tracked. |
| * |
| * @param serviceName the name of the service |
| * @return this service dependency |
| */ |
| public synchronized ServiceDependency setService(Class serviceName) { |
| ensureNotActive(); |
| if (serviceName == null) { |
| throw new IllegalArgumentException("Service name cannot be null."); |
| } |
| m_trackedServiceName = serviceName; |
| m_trackedServiceReference = null; |
| m_trackedServiceFilter = null; |
| return this; |
| } |
| |
| /** |
| * Sets the name of the service that should be tracked. You can either specify |
| * only the name, or the name and a filter. In the latter case, 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. |
| * |
| * @param serviceName the name of the service |
| * @param serviceFilter the filter condition |
| * @return this service dependency |
| */ |
| public synchronized ServiceDependency setService(Class serviceName, String serviceFilter) { |
| ensureNotActive(); |
| if (serviceName == null) { |
| throw new IllegalArgumentException("Service name cannot be null."); |
| } |
| m_trackedServiceName = serviceName; |
| if (serviceFilter != null) { |
| m_trackedServiceFilterUnmodified = serviceFilter; |
| m_trackedServiceFilter ="(&(" + Constants.OBJECTCLASS + "=" + serviceName.getName() + ")" + serviceFilter + ")"; |
| } |
| else { |
| m_trackedServiceFilterUnmodified = null; |
| m_trackedServiceFilter = null; |
| } |
| m_trackedServiceReference = null; |
| return this; |
| } |
| |
| public synchronized ServiceDependency setService(String serviceFilter) { |
| ensureNotActive(); |
| if (serviceFilter == null) { |
| throw new IllegalArgumentException("Service filter cannot be null."); |
| } |
| m_trackedServiceName = Object.class; |
| if (serviceFilter != null) { |
| m_trackedServiceFilterUnmodified = serviceFilter; |
| m_trackedServiceFilter = serviceFilter; |
| } |
| m_trackedServiceReference = null; |
| return this; |
| } |
| |
| /** |
| * Sets the name of the service that should be tracked. You can either specify |
| * only the name, or the name and a reference. In the latter case, the service reference |
| * is used to track the service and should only return services of the type that was |
| * specified in the name. |
| * |
| * @param serviceName the name of the service |
| * @param serviceReference the service reference to track |
| * @return this service dependency |
| */ |
| public synchronized ServiceDependency setService(Class serviceName, ServiceReference serviceReference) { |
| ensureNotActive(); |
| if (serviceName == null) { |
| throw new IllegalArgumentException("Service name cannot be null."); |
| } |
| m_trackedServiceName = serviceName; |
| m_trackedServiceReference = serviceReference; |
| m_trackedServiceFilterUnmodified = null; |
| m_trackedServiceFilter = 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 |
| */ |
| 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 |
| */ |
| public synchronized ServiceDependency setRequired(boolean required) { |
| ensureNotActive(); |
| setIsRequired(required); |
| return this; |
| } |
| |
| 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 |
| */ |
| 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 |
| */ |
| 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 |
| */ |
| public synchronized ServiceDependency setCallbacks(String added, String removed) { |
| return setCallbacks(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 |
| */ |
| public synchronized ServiceDependency setCallbacks(String added, String changed, String removed) { |
| return setCallbacks(null, added, changed, removed); |
| } |
| |
| /** |
| * 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 |
| */ |
| public synchronized ServiceDependency setCallbacks(Object instance, String added, String removed) { |
| return setCallbacks(instance, added, 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 |
| */ |
| public synchronized ServiceDependency setCallbacks(Object instance, String added, String changed, String removed) { |
| 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) && ! m_autoConfigInvoked) { |
| setAutoConfig(false); |
| } |
| m_callbackInstance = instance; |
| m_callbackAdded = added; |
| m_callbackChanged = changed; |
| m_callbackRemoved = removed; |
| return this; |
| } |
| |
| private void ensureNotActive() { |
| if (m_tracker != null) { |
| throw new IllegalStateException("Cannot modify state while active."); |
| } |
| } |
| |
| public synchronized String toString() { |
| return "ServiceDependency[" + m_trackedServiceName + " " + m_trackedServiceFilterUnmodified + "]"; |
| } |
| |
| public String getAutoConfigName() { |
| return m_autoConfigInstance; |
| } |
| |
| public Object getAutoConfigInstance() { |
| return lookupService(); |
| } |
| |
| public Class getAutoConfigType() { |
| return getInterface(); |
| } |
| |
| 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(); |
| } |
| |
| public int getState() { |
| return (isAvailable() ? 1 : 0) + (isRequired() ? 2 : 0); |
| } |
| |
| public String getType() { |
| return "service"; |
| } |
| |
| public void invokeAdded(DependencyService service) { |
| 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); |
| } |
| } |
| } |
| |
| public void invokeRemoved(DependencyService service) { |
| Set references = null; |
| synchronized (m_sr) { |
| references = (Set) m_sr.get(service); |
| } |
| Tuple[] refs = (Tuple[]) (references != null ? references.toArray(new Tuple[references.size()]) : 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); |
| } |
| if (references != null) { |
| references.clear(); |
| } |
| } |
| |
| 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"); |
| } |
| } |
| |
| public boolean isPropagated() { |
| return m_propagate; |
| } |
| |
| public ServiceDependency setPropagate(boolean propagate) { |
| ensureNotActive(); |
| m_propagate = propagate; |
| return this; |
| } |
| |
| public ServiceDependency setPropagate(Object instance, String method) { |
| setPropagate(instance != null && method != null); |
| m_propagateCallbackInstance = instance; |
| m_propagateCallbackMethod = method; |
| return this; |
| } |
| |
| // TODO add equals and hashCode methods, so you can compare dependencies |
| } |