// Copyright 2006, 2008 The Apache Software Foundation | |
// | |
// 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.tapestry5.ioc.internal.services; | |
import org.apache.tapestry5.ioc.ObjectCreator; | |
import org.apache.tapestry5.ioc.services.PerthreadManager; | |
/** | |
* Provides per-thread implementations of services. | |
*/ | |
public class PerThreadServiceCreator implements ObjectCreator | |
{ | |
private final PerthreadManager perthreadManager; | |
private final ObjectCreator delegate; | |
public PerThreadServiceCreator(PerthreadManager perthreadManager, ObjectCreator delegate) | |
{ | |
this.perthreadManager = perthreadManager; | |
this.delegate = delegate; | |
} | |
/** | |
* For each thread, the first call will use the delegate {@link org.apache.tapestry5.ioc.ObjectCreator} to create an | |
* instance, and later calls will reuse the same per-thread instance. The instance is stored in the {@link | |
* org.apache.tapestry5.ioc.services.PerthreadManager} and will be released at the end of the request. | |
*/ | |
public Object createObject() | |
{ | |
// Use the ObjectCreator instance as the key. it will be unique. | |
Object perthreadInstance = perthreadManager.get(delegate); | |
if (perthreadInstance == null) | |
{ | |
perthreadInstance = delegate.createObject(); | |
perthreadManager.put(delegate, perthreadInstance); | |
} | |
return perthreadInstance; | |
} | |
} |