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/**
*
* 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.container.java.context;
import java.util.Iterator;
import org.apache.tuscany.core.builder.ObjectFactory;
import org.apache.tuscany.core.context.AbstractContext;
import org.apache.tuscany.core.context.Context;
import org.apache.tuscany.core.context.ContextInitException;
import org.apache.tuscany.core.context.LifecycleEventListener;
import org.apache.tuscany.core.context.QualifiedName;
import org.apache.tuscany.core.context.SimpleComponentContext;
import org.apache.tuscany.core.context.TargetException;
import org.apache.tuscany.core.injection.EventInvoker;
import org.apache.tuscany.core.injection.Injector;
import org.apache.tuscany.core.injection.ObjectCallbackException;
import org.apache.tuscany.core.injection.ObjectCreationException;
/**
* Manages Java service component implementation instances
*
* @version $Rev$ $Date$
*/
public class JavaComponentContext extends AbstractContext implements SimpleComponentContext {
private boolean eagerInit;
private EventInvoker initInvoker;
private EventInvoker destroyInvoker;
private Injector componentName;
private Injector moduleContext;
private boolean stateless;
// the cached target instance
private Object cachedTargetInstance;
// creates a new implementation instance with injected references and properties
private ObjectFactory objectFactory;
// ----------------------------------
// Constructors
// ----------------------------------
public JavaComponentContext(String name, ObjectFactory objectFactory, boolean eagerInit, EventInvoker initInvoker,
EventInvoker destroyInvoker, boolean stateless) {
super(name);
assert (objectFactory != null) : "Object factory was null";
if (eagerInit == true && initInvoker == null) {
ContextInitException e = new ContextInitException("No intialization method found for implementation");
e.setIdentifier(getName());
throw e;
}
this.objectFactory = objectFactory;
this.eagerInit = eagerInit;
this.initInvoker = initInvoker;
this.destroyInvoker = destroyInvoker;
this.stateless = stateless;
}
// ----------------------------------
// Methods
// ----------------------------------
public void setName(String name) {
super.setName(name);
}
protected int type;
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
public synchronized Object getInstance(QualifiedName qName) throws TargetException {
return getInstance(qName, true);
}
public synchronized Object getInstance(QualifiedName qName, boolean notify) throws TargetException {
//TODO implement returning of proxy and invocation chain for service
if (cachedTargetInstance != null) {
return cachedTargetInstance; // already cached, just return
}
if (getLifecycleState() == ERROR || getLifecycleState() == CONFIG_ERROR) {
return null;
}
synchronized (this) {
try {
Object instance = objectFactory.getInstance();
startInstance(instance);
if (notify) {
for (Iterator iter = contextListener.iterator(); iter.hasNext();) {
LifecycleEventListener listener = (LifecycleEventListener) iter.next();
listener.onInstanceCreate(this);
}
}
setLifecycleState(RUNNING);
if (stateless) {
return instance;
} else {
// cache the actual instance
cachedTargetInstance = instance;
return cachedTargetInstance;
}
} catch (ObjectCreationException e) {
setLifecycleState(Context.ERROR);
TargetException te = new TargetException("Error creating instance for component", e);
te.setIdentifier(getName());
throw te;
}
}
}
public Object getImplementationInstance() throws TargetException{
//TODO refactor when getInstance() returns a proxy
return getInstance(null);
}
public Object getImplementationInstance(boolean notify) throws TargetException{
//TODO refactor when getInstance() returns a proxy
return getInstance(null,notify);
}
public boolean isEagerInit() {
return eagerInit;
}
public boolean isDestroyable() {
return (destroyInvoker != null);
}
// ----------------------------------
// Lifecycle methods
// ----------------------------------
public void start() throws ContextInitException {
if (getLifecycleState() != UNINITIALIZED && getLifecycleState() != STOPPED) {
throw new IllegalStateException("Component must be in UNINITIALIZED state [" + getLifecycleState() + "]");
}
if (objectFactory == null) {
setLifecycleState(ERROR);
ContextInitException e = new ContextInitException("Object factory not found");
e.setIdentifier(getName());
throw e;
}
setLifecycleState(INITIALIZED);
}
public void stop() {
if (cachedTargetInstance != null) {
if (destroyInvoker != null) {
try {
destroyInvoker.invokeEvent(cachedTargetInstance);
} catch (ObjectCallbackException e) {
TargetException te = new TargetException(e.getCause());
te.setIdentifier(getName());
throw te;
}
}
}
setLifecycleState(STOPPED);
}
// ----------------------------------
// Private methods
// ----------------------------------
private void startInstance(Object instance) throws TargetException {
try {
// handle @Init
if (initInvoker != null) {
initInvoker.invokeEvent(instance);
}
} catch (ObjectCallbackException e) {
TargetException te = new TargetException("Error initializing instance", e);
te.setIdentifier(getName());
throw te;
}
}
}
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