Sketching out component configuration model & API.
Added initial cut of implementation.
Finished implementation; ready for merge.
Change-Id: I385181c0591604a5c44986b97fb881eba7e0528e
diff --git a/core/net/src/main/java/org/onosproject/cfg/impl/ComponentConfigManager.java b/core/net/src/main/java/org/onosproject/cfg/impl/ComponentConfigManager.java
new file mode 100644
index 0000000..bab7ac1
--- /dev/null
+++ b/core/net/src/main/java/org/onosproject/cfg/impl/ComponentConfigManager.java
@@ -0,0 +1,241 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed 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.onosproject.cfg.impl;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Maps;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.onosproject.cfg.ComponentConfigEvent;
+import org.onosproject.cfg.ComponentConfigService;
+import org.onosproject.cfg.ComponentConfigStore;
+import org.onosproject.cfg.ComponentConfigStoreDelegate;
+import org.onosproject.cfg.ConfigProperty;
+import org.osgi.service.cm.Configuration;
+import org.osgi.service.cm.ConfigurationAdmin;
+import org.slf4j.Logger;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Dictionary;
+import java.util.Enumeration;
+import java.util.Hashtable;
+import java.util.Map;
+import java.util.Set;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Implementation of the centralized component configuration service.
+ */
+@Component(immediate = true)
+@Service
+public class ComponentConfigManager implements ComponentConfigService {
+
+ private static final String COMPONENT_NULL = "Component name cannot be null";
+ private static final String PROPERTY_NULL = "Property name cannot be null";
+
+ private static final String RESOURCE_EXT = ".cfgdef";
+
+ private final Logger log = getLogger(getClass());
+
+ private final ComponentConfigStoreDelegate delegate = new InternalStoreDelegate();
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected ComponentConfigStore store;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected ConfigurationAdmin cfgAdmin;
+
+ // Locally maintained catalog of definitions.
+ private final Map<String, Map<String, ConfigProperty>> properties =
+ Maps.newConcurrentMap();
+
+ @Activate
+ public void activate() {
+ store.setDelegate(delegate);
+ log.info("Started");
+ }
+
+ @Deactivate
+ public void deactivate() {
+ store.unsetDelegate(delegate);
+ log.info("Stopped");
+ }
+
+ @Override
+ public Set<String> getComponentNames() {
+ return ImmutableSet.copyOf(properties.keySet());
+ }
+
+ @Override
+ public void registerProperties(Class<?> componentClass) {
+ String componentName = componentClass.getName();
+ String resourceName = componentClass.getSimpleName() + RESOURCE_EXT;
+ try (InputStream ris = componentClass.getResourceAsStream(resourceName)) {
+ checkArgument(ris != null, "Property definitions not found at resource %s",
+ resourceName);
+
+ // Read the definitions
+ Set<ConfigProperty> defs = ConfigPropertyDefinitions.read(ris);
+
+ // Produce a new map of the properties and register it.
+ Map<String, ConfigProperty> map = Maps.newConcurrentMap();
+ defs.forEach(p -> map.put(p.name(), p));
+
+ properties.put(componentName, map);
+ loadExistingValues(componentName);
+ } catch (IOException e) {
+ log.error("Unable to read property definitions from resource " + resourceName, e);
+ }
+ }
+
+ @Override
+ public void unregisterProperties(Class<?> componentClass, boolean clear) {
+ String componentName = componentClass.getName();
+ checkNotNull(componentName, COMPONENT_NULL);
+ Map<String, ConfigProperty> cps = properties.remove(componentName);
+ if (cps != null) {
+ cps.keySet().forEach(name -> store.unsetProperty(componentName, name));
+ }
+
+ if (clear) {
+ clearExistingValues(componentName);
+ }
+ }
+
+ // Clears any existing values that may have been set.
+ private void clearExistingValues(String componentName) {
+ triggerUpdate(componentName);
+ }
+
+ @Override
+ public Set<ConfigProperty> getProperties(String componentName) {
+ return ImmutableSet.copyOf(properties.get(componentName).values());
+ }
+
+ @Override
+ public void setProperty(String componentName, String name, String value) {
+ checkNotNull(componentName, COMPONENT_NULL);
+ checkNotNull(name, PROPERTY_NULL);
+ store.setProperty(componentName, name, value);
+ }
+
+ @Override
+ public void unsetProperty(String componentName, String name) {
+ checkNotNull(componentName, COMPONENT_NULL);
+ checkNotNull(name, PROPERTY_NULL);
+ store.unsetProperty(componentName, name);
+ }
+
+ private class InternalStoreDelegate implements ComponentConfigStoreDelegate {
+
+ @Override
+ public void notify(ComponentConfigEvent event) {
+ String componentName = event.subject();
+ String name = event.name();
+ String value = event.value();
+
+ switch (event.type()) {
+ case PROPERTY_SET:
+ set(componentName, name, value);
+ break;
+ case PROPERTY_UNSET:
+ reset(componentName, name);
+ break;
+ default:
+ break;
+ }
+ }
+ }
+
+ // Locates the property in the component map and replaces it with an
+ // updated copy.
+ private void set(String componentName, String name, String value) {
+ Map<String, ConfigProperty> map = properties.get(componentName);
+ if (map != null) {
+ ConfigProperty prop = map.get(name);
+ if (prop != null) {
+ map.put(name, ConfigProperty.setProperty(prop, value));
+ triggerUpdate(componentName);
+ return;
+ }
+ }
+ log.warn("Unable to set non-existent property {} for component {}",
+ name, componentName);
+ }
+
+ // Locates the property in the component map and replaces it with an
+ // reset copy.
+ private void reset(String componentName, String name) {
+ Map<String, ConfigProperty> map = properties.get(componentName);
+ if (map != null) {
+ ConfigProperty prop = map.get(name);
+ if (prop != null) {
+ map.put(name, ConfigProperty.resetProperty(prop));
+ triggerUpdate(componentName);
+ return;
+ }
+ }
+ log.warn("Unable to reset non-existent property {} for component {}",
+ name, componentName);
+ }
+
+ // Loads existing property values that may have been set.
+ private void loadExistingValues(String componentName) {
+ // FIXME: implement this by talking to the config admin.
+ try {
+ Configuration cfg = cfgAdmin.getConfiguration(componentName);
+ Map<String, ConfigProperty> map = properties.get(componentName);
+ Dictionary<String, Object> props = cfg.getProperties();
+ if (props != null) {
+ Enumeration<String> it = props.keys();
+ while (it.hasMoreElements()) {
+ String name = it.nextElement();
+ ConfigProperty p = map.get(name);
+ if (p != null) {
+ map.put(name, ConfigProperty.setProperty(p, (String) props.get(name)));
+ }
+ }
+ }
+ } catch (IOException e) {
+ log.error("Unable to get configuration for " + componentName, e);
+ }
+
+ }
+
+ // FIXME: This should be a slightly deferred execution to allow changing
+ // values just once per component when a number of updates arrive shortly
+ // after each other.
+ private void triggerUpdate(String componentName) {
+ try {
+ Configuration cfg = cfgAdmin.getConfiguration(componentName);
+ Map<String, ConfigProperty> map = properties.get(componentName);
+ Dictionary<String, Object> props = new Hashtable<>();
+ map.values().forEach(p -> props.put(p.name(), p.value()));
+ cfg.update(props);
+ } catch (IOException e) {
+ log.warn("Unable to update configuration for " + componentName, e);
+ }
+ }
+
+}