/* * Copyright 2002-2005 the original author or authors. * * 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.jencks.interceptor;import org.aopalliance.intercept.MethodInterceptor;import org.aopalliance.intercept.MethodInvocation;import org.apache.geronimo.transaction.DefaultInstanceContext;import org.apache.geronimo.transaction.InstanceContext;import org.apache.geronimo.transaction.TrackedConnectionAssociator;import java.util.HashSet;import java.util.Set;/** * This servlet filter is used to enter in a transactional context * automtically at every servlet call and exit of it when the response * is sent back to the client. * * @author Thierry Templier * @see TrackedConnectionAssociator#enter(InstanceContext) * @see TrackedConnectionAssociator#exit(InstanceContext) * @see InstanceContext * @see DefaultInstanceContext */public class TransactionContextInterceptor implements MethodInterceptor {    private TrackedConnectionAssociator associator;    /**     * This is the central method of the filter which allows the     * request to enter in a transactionnal context and exit when     * the request is sent back to the client.     *     * @see #enterContext(Set, Set)     * @see #exitContext(InstanceContext)     */    public Object invoke(MethodInvocation invocation) throws Throwable {        Set unshareableResources = new HashSet();        Set applicationManagedSecurityResources = new HashSet();        InstanceContext context = associator.enter(                new DefaultInstanceContext(unshareableResources, applicationManagedSecurityResources));        Object returnValue = invocation.proceed();        associator.exit(context);        return returnValue;    }    /**     * Set the TrackedConnectionAssociator instance to allow the bean     * to enter and exit a transactional context.     */    public void setAssociator(TrackedConnectionAssociator associator) {        this.associator = associator;    }}