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Diffstat (limited to 'sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/context/scope/ModuleScopeContext.java')
| -rw-r--r-- | sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/context/scope/ModuleScopeContext.java | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/context/scope/ModuleScopeContext.java b/sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/context/scope/ModuleScopeContext.java new file mode 100644 index 0000000000..00f2747fae --- /dev/null +++ b/sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/context/scope/ModuleScopeContext.java @@ -0,0 +1,182 @@ +/** + * + * Copyright 2005 The Apache Software Foundation or its licensors, as applicable. + * + * 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.apache.tuscany.core.context.scope; + +import java.util.Map; +import java.util.Queue; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.ConcurrentLinkedQueue; + +import org.apache.tuscany.core.builder.RuntimeConfiguration; +import org.apache.tuscany.core.context.Context; +import org.apache.tuscany.core.context.CoreRuntimeException; +import org.apache.tuscany.core.context.EventContext; +import org.apache.tuscany.core.context.InstanceContext; +import org.apache.tuscany.core.context.LifecycleEventListener; +import org.apache.tuscany.core.context.RuntimeEventListener; +import org.apache.tuscany.core.context.SimpleComponentContext; + +/** + * Manages component contexts whose implementations are module scoped + * + * @version $Rev$ $Date$ + */ +public class ModuleScopeContext extends AbstractScopeContext implements RuntimeEventListener, LifecycleEventListener { + + // ---------------------------------- + // Fields + // ---------------------------------- + + // Component contexts in this scope keyed by name + private Map<String, InstanceContext> componentContexts; + + private Queue<SimpleComponentContext> destroyableContexts; + + // ---------------------------------- + // Constructor + // ---------------------------------- + + public ModuleScopeContext(EventContext eventContext) { + super(eventContext); + setName("Module Scope"); + } + + // ---------------------------------- + // Listener methods + // ---------------------------------- + + public void onEvent(int type, Object key) { + if (type == EventContext.MODULE_START) { + lifecycleState = RUNNING; + initComponentContexts(); + } else if (type == EventContext.MODULE_STOP) { + notifyInstanceShutdown(key); + } + } + + // ---------------------------------- + // Lifecycle methods + // ---------------------------------- + + public synchronized void start() { + if (lifecycleState != UNINITIALIZED) { + throw new IllegalStateException("Scope must be in UNINITIALIZED state [" + lifecycleState + "]"); + } + } + + public synchronized void stop() { + if (lifecycleState != RUNNING) { + throw new IllegalStateException("Scope in wrong state [" + lifecycleState + "]"); + } + super.stop(); + componentContexts = null; + destroyableContexts = null; + lifecycleState = STOPPED; + } + + // ---------------------------------- + // Methods + // ---------------------------------- + + public boolean isCacheable() { + return true; + } + + public void registerConfiguration(RuntimeConfiguration<InstanceContext> configuration) { + runtimeConfigurations.put(configuration.getName(), configuration); + if (lifecycleState == RUNNING) { + componentContexts.put(configuration.getName(), configuration.createInstanceContext()); + } + } + + public InstanceContext getContext(String ctxName) { + checkInit(); + return componentContexts.get(ctxName); + } + + public InstanceContext getContextByKey(String ctxName, Object key) { + checkInit(); + return componentContexts.get(ctxName); + } + + public void removeContext(String ctxName) { + checkInit(); + Object component = componentContexts.remove(ctxName); + if (component != null) { + destroyableContexts.remove(component); + } + } + + public void removeContextByKey(String ctxName, Object key) { + checkInit(); + removeContext(ctxName); + } + + public void onInstanceCreate(Context context) { + checkInit(); + if (context instanceof SimpleComponentContext) { + SimpleComponentContext serviceContext = (SimpleComponentContext) context; + // Queue the context to have its implementation instance released if destroyable + if (serviceContext.isDestroyable()) { + destroyableContexts.add(serviceContext); + } + } + } + + /** + * Returns an array of {@link SimpleComponentContext}s representing components that need to be notified of scope shutdown. + */ + protected InstanceContext[] getShutdownContexts(Object key) { + if (destroyableContexts != null) { + // create 0-length array since Queue.size() has O(n) traversal + return (InstanceContext[]) destroyableContexts.toArray(new InstanceContext[0]); + } else { + return null; + } + } + + // ---------------------------------- + // Private methods + // ---------------------------------- + + private synchronized void initComponentContexts() throws CoreRuntimeException { + if (componentContexts == null) { + componentContexts = new ConcurrentHashMap(); + destroyableContexts = new ConcurrentLinkedQueue(); + for (RuntimeConfiguration<InstanceContext> config : runtimeConfigurations.values()) { + InstanceContext context = config.createInstanceContext(); + context.addContextListener(this); + context.start(); + componentContexts.put(context.getName(), context); + } + // Initialize eager contexts. Note this cannot be done when we initially create each context since a component may + // contain a forward reference to a component which has not been instantiated + for (InstanceContext context : componentContexts.values()) { + if (context instanceof SimpleComponentContext) { + SimpleComponentContext simpleCtx = (SimpleComponentContext) context; + if (simpleCtx.isEagerInit()) { + // perform silent creation and manual shutdown registration + simpleCtx.getInstance(null, false); + if (simpleCtx.isDestroyable()) { + destroyableContexts.add(simpleCtx); + } + } + } + } + } + } +}
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