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/*
* 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.tuscany.core.component.scope;
import java.net.URI;
import org.apache.tuscany.spi.component.AtomicComponent;
import org.apache.tuscany.spi.component.InstanceWrapper;
import org.apache.tuscany.spi.component.PersistenceException;
import org.apache.tuscany.spi.component.ScopeContainer;
import org.apache.tuscany.spi.component.ScopeContainerMonitor;
import org.apache.tuscany.spi.component.TargetDestructionException;
import org.apache.tuscany.spi.component.TargetResolutionException;
import org.apache.tuscany.spi.component.WorkContext;
import org.apache.tuscany.spi.event.Event;
import org.apache.tuscany.spi.event.RuntimeEventListener;
import org.apache.tuscany.spi.model.Scope;
import org.apache.tuscany.spi.services.store.Store;
import org.apache.tuscany.spi.services.store.StoreExpirationEvent;
import org.apache.tuscany.spi.services.store.StoreReadException;
import org.apache.tuscany.spi.services.store.StoreWriteException;
/**
* A scope context which manages atomic component instances keyed on a conversation session
*
* @version $Rev: 452655 $ $Date: 2006-10-03 18:09:02 -0400 (Tue, 03 Oct 2006) $
*/
public class ConversationalScopeContainer extends AbstractScopeContainer implements ScopeContainer {
private final WorkContext workContext;
private final Store nonDurableStore;
public ConversationalScopeContainer(Store store, WorkContext workContext, final ScopeContainerMonitor monitor) {
super(Scope.CONVERSATION, monitor);
this.workContext = workContext;
this.nonDurableStore = store;
if (store != null) {
store.addListener(new ExpirationListener(monitor));
}
}
public void onEvent(Event event) {
checkInit();
}
public synchronized void start() {
if (lifecycleState != UNINITIALIZED && lifecycleState != STOPPED) {
throw new IllegalStateException("Scope must be in UNINITIALIZED or STOPPED state [" + lifecycleState + "]");
}
lifecycleState = RUNNING;
}
public synchronized void stop() {
lifecycleState = STOPPED;
}
public void register(AtomicComponent component, URI groupId) {
super.register(component, groupId);
component.addListener(this);
}
public void unregister(AtomicComponent component) {
// FIXME should all the instances associated with this component be remove already
component.removeListener(this);
super.unregister(component);
}
public void persistNew(AtomicComponent component, String id, Object instance, long expiration)
throws PersistenceException {
try {
nonDurableStore.insertRecord(component, id, instance, expiration);
} catch (StoreWriteException e) {
throw new PersistenceException(e);
}
}
public void persist(AtomicComponent component, String id, Object instance, long expiration)
throws PersistenceException {
try {
nonDurableStore.updateRecord(component, id, instance, expiration);
} catch (StoreWriteException e) {
throw new PersistenceException(e);
}
}
public void remove(AtomicComponent component) throws PersistenceException {
String conversationId = getConversationId();
try {
workContext.setCurrentAtomicComponent(component);
// FIXME this should be an InstanceWrapper and shouldn't we stop it?
Object instance = nonDurableStore.readRecord(component, conversationId);
if (instance != null) {
nonDurableStore.removeRecord(component, conversationId);
}
} catch (StoreReadException e) {
throw new PersistenceException(e);
} catch (StoreWriteException e) {
throw new PersistenceException(e);
}
}
protected InstanceWrapper getInstanceWrapper(AtomicComponent component, boolean create)
throws TargetResolutionException {
String conversationId = getConversationId();
try {
workContext.setCurrentAtomicComponent(component);
InstanceWrapper wrapper = (InstanceWrapper) nonDurableStore.readRecord(component, conversationId);
if (wrapper != null) {
if (component.getMaxIdleTime() > 0) {
// update expiration
long expire = System.currentTimeMillis() + component.getMaxIdleTime();
nonDurableStore.updateRecord(component, conversationId, wrapper, expire);
}
} else if (create) {
// FIXME should the store really be persisting the wrappers
wrapper = component.createInstanceWrapper();
wrapper.start();
long expire = calculateExpiration(component);
nonDurableStore.insertRecord(component, conversationId, wrapper, expire);
}
return wrapper;
} catch (StoreReadException e) {
throw new TargetResolutionException("Error retrieving target instance", e);
} catch (StoreWriteException e) {
throw new TargetResolutionException("Error persisting target instance", e);
} finally {
workContext.setCurrentAtomicComponent(null);
}
}
/**
* Returns the conversation id associated with the current invocation context
* @return the conversation id
*/
private String getConversationId() {
String conversationId = (String) workContext.getIdentifier(Scope.CONVERSATION);
assert conversationId != null;
return conversationId;
}
private long calculateExpiration(AtomicComponent component) {
if (component.getMaxAge() > 0) {
long now = System.currentTimeMillis();
return now + component.getMaxAge();
} else if (component.getMaxIdleTime() > 0) {
long now = System.currentTimeMillis();
return now + component.getMaxIdleTime();
} else {
return Store.DEFAULT_EXPIRATION_OFFSET;
}
}
/**
* Receives expiration events from the store and notifies the corresponding atomic component
*/
private static class ExpirationListener implements RuntimeEventListener {
private final ScopeContainerMonitor monitor;
public ExpirationListener(ScopeContainerMonitor monitor) {
this.monitor = monitor;
}
public void onEvent(Event event) {
if (event instanceof StoreExpirationEvent) {
StoreExpirationEvent expiration = (StoreExpirationEvent) event;
InstanceWrapper wrapper = (InstanceWrapper) expiration.getInstance();
try {
wrapper.stop();
} catch (TargetDestructionException e) {
monitor.destructionError(e);
}
}
}
}
}
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