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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.sca.core.scope;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.tuscany.sca.core.factory.InstanceWrapper;
import org.apache.tuscany.sca.provider.ImplementationProvider;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
/**
* Implements functionality common to scope contexts.
*
* @version $Rev$ $Date$
*/
public abstract class AbstractScopeContainer<KEY> implements ScopeContainer<KEY> {
protected Map<KEY, InstanceWrapper<?>> wrappers = new ConcurrentHashMap<KEY, InstanceWrapper<?>>();
protected final Scope scope;
protected RuntimeComponent component;
protected volatile int lifecycleState = UNINITIALIZED;
private static String scopeStateStrings[] = {"CONFIG_ERROR",
"UNINITIALIZED",
"INITIALIZING",
"INITIALIZED",
"NOT USED",
"RUNNING",
"STOPPING",
"STOPPED",
"ERROR"};
public AbstractScopeContainer(Scope scope, RuntimeComponent component) {
this.scope = scope;
this.component = component;
}
protected void checkInit() {
if (getLifecycleState() != RUNNING) {
throw new IllegalStateException("Scope container not running. Current state is [" +
scopeStateStrings[getLifecycleState() + 1] +
"]");
}
}
/**
* Creates a new physical instance of a component, wrapped in an
* InstanceWrapper.
*
* @param component the component whose instance should be created
* @return a wrapped instance that has been injected but not yet started
* @throws TargetResolutionException if there was a problem creating the
* instance
*/
protected InstanceWrapper createInstanceWrapper() throws TargetResolutionException {
ImplementationProvider implementationProvider = component.getImplementationProvider();
if (implementationProvider instanceof ScopedImplementationProvider) {
return ((ScopedImplementationProvider)implementationProvider).createInstanceWrapper();
}
return null;
}
public InstanceWrapper getAssociatedWrapper(KEY contextId) throws TargetResolutionException {
return getWrapper(contextId); // TODO: what is this method supposed to do diff than getWrapper?
}
public Scope getScope() {
return scope;
}
public InstanceWrapper getWrapper(KEY contextId) throws TargetResolutionException {
return wrappers.get(contextId);
}
public void addWrapperReference(KEY existingContextId, KEY newContextId)
throws TargetResolutionException {
// do nothing here. the conversational scope container implements this
}
public void registerWrapper(InstanceWrapper wrapper, KEY contextId) throws TargetResolutionException {
// do nothing here. the conversational scope container implements this
}
protected boolean isEagerInit() {
ImplementationProvider implementationProvider = ((RuntimeComponent)component).getImplementationProvider();
if (implementationProvider instanceof ScopedImplementationProvider) {
return ((ScopedImplementationProvider)implementationProvider).isEagerInit();
}
return false;
}
public void returnWrapper(InstanceWrapper wrapper, KEY contextId) throws TargetDestructionException {
}
/**
* Default implementation of remove which does nothing
*
* @param contextId the identifier of the context to remove.
*/
public void remove(KEY contextId)
throws TargetDestructionException {
}
public synchronized void start() {
int lifecycleState = getLifecycleState();
if (lifecycleState != UNINITIALIZED && lifecycleState != STOPPED) {
throw new IllegalStateException("Scope must be in UNINITIALIZED or STOPPED state but the current state is [" +
scopeStateStrings[lifecycleState + 1] +
"]. Did you try to start the same node twice?");
}
setLifecycleState(RUNNING);
}
public void startContext(KEY contextId) {
if(isEagerInit()) {
try {
getWrapper(contextId);
} catch (TargetResolutionException e) {
//
}
}
}
public synchronized void stop() {
int lifecycleState = getLifecycleState();
if (lifecycleState != RUNNING) {
throw new IllegalStateException("Scope in wrong state. Current state is [" +
scopeStateStrings[lifecycleState + 1] +
"]");
}
setLifecycleState(STOPPED);
}
public void stopContext(KEY contextId) {
wrappers.remove(contextId);
}
@Override
public String toString() {
return "In state [" + scopeStateStrings[lifecycleState + 1] + ']';
}
public RuntimeComponent getComponent() {
return component;
}
public void setComponent(RuntimeComponent component) {
this.component = component;
}
public int getLifecycleState() {
return lifecycleState;
}
/**
* Set the current state of the Lifecycle.
*
* @param lifecycleState the new state
*/
protected void setLifecycleState(int lifecycleState) {
this.lifecycleState = lifecycleState;
}
}
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