    001// Licensed under the Apache License, Version 2.0 (the "License");
    002// you may not use this file except in compliance with the License.
    003// You may obtain a copy of the License at
    004//
    005// http://www.apache.org/licenses/LICENSE-2.0
    006//
    007// Unless required by applicable law or agreed to in writing, software
    008// distributed under the License is distributed on an "AS IS" BASIS,
    009// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    010// See the License for the specific language governing permissions and
    011// limitations under the License.
    012
    013package org.apache.tapestry5.ioc.internal.services;
    014
    015import org.apache.tapestry5.commons.ObjectCreator;
    016import org.apache.tapestry5.commons.services.PlasticProxyFactory;
    017import org.apache.tapestry5.ioc.ServiceLifecycle;
    018import org.apache.tapestry5.ioc.ServiceResources;
    019import org.apache.tapestry5.ioc.services.Builtin;
    020import org.apache.tapestry5.ioc.services.PerthreadManager;
    021
    022/**
    023 * Allows a service to exist "per thread" (in each thread). Creates a proxy that delegates to a per-thread instance.
    024 *
    025 * This scheme ensures that, although the service builder method will be invoked many times over the life of the
    026 * application, the service decoration process occurs only once. The final calling chain is: Service Proxy --&gt;
    027 * Interceptor(s) (from Decorators) --&gt; Advise Proxy (from Advisiors) --&gt; PerThread Proxy --&gt; (per thread)
    028 * instance.
    029 */
    030@SuppressWarnings("all")
    031public class PerThreadServiceLifecycle implements ServiceLifecycle
    032{
    033    private final PerthreadManager perthreadManager;
    034
    035    private final PlasticProxyFactory proxyFactory;
    036
    037    public PerThreadServiceLifecycle(@Builtin
    038    PerthreadManager perthreadManager,
    039
    040    @Builtin
    041    PlasticProxyFactory proxyFactory)
    042    {
    043        this.perthreadManager = perthreadManager;
    044        this.proxyFactory = proxyFactory;
    045    }
    046
    047    /**
    048     * Returns false; this lifecycle represents a service that will be created many times (by each thread).
    049     */
    050    @Override
    051    public boolean isSingleton()
    052    {
    053        return false;
    054    }
    055
    056    @Override
    057    public Object createService(ServiceResources resources, ObjectCreator creator)
    058    {
    059        ObjectCreator perThreadCreator = perthreadManager.createValue(creator);
    060
    061        Class serviceInterface = resources.getServiceInterface();
    062
    063        return proxyFactory.createProxy(serviceInterface, perThreadCreator, "<PerThread Proxy for " + resources.getServiceId() + "(" + serviceInterface.getName() + ")>");
    064    }
    065}