org.springframework.orm.hibernate43.support.AsyncRequestInterceptor.java Source code

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Here is the source code for org.springframework.orm.hibernate43.support.AsyncRequestInterceptor.java

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/*
 * Copyright 2002-2013 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.springframework.orm.hibernate43.support;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.SessionFactory;
import org.springframework.orm.hibernate43.SessionFactoryUtils;
import org.springframework.orm.hibernate43.SessionHolder;
import org.springframework.transaction.support.TransactionSynchronizationManager;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.context.request.async.CallableProcessingInterceptorAdapter;
import org.springframework.web.context.request.async.DeferredResult;
import org.springframework.web.context.request.async.DeferredResultProcessingInterceptor;

import java.util.concurrent.Callable;

/**
 * An interceptor with asynchronous web requests used in OpenSessionInViewFilter and
 * OpenSessionInViewInterceptor.
 *
 * Ensures the following:
 * 1) The session is bound/unbound when "callable processing" is started
 * 2) The session is closed if an async request times out
 *
 * @author Rossen Stoyanchev
 * @since 3.2.5
 */
public class AsyncRequestInterceptor extends CallableProcessingInterceptorAdapter
        implements DeferredResultProcessingInterceptor {

    private static Log logger = LogFactory.getLog(AsyncRequestInterceptor.class);

    private final SessionFactory sessionFactory;

    private final SessionHolder sessionHolder;

    private volatile boolean timeoutInProgress;

    public AsyncRequestInterceptor(SessionFactory sessionFactory, SessionHolder sessionHolder) {
        this.sessionFactory = sessionFactory;
        this.sessionHolder = sessionHolder;
    }

    @Override
    public <T> void preProcess(NativeWebRequest request, Callable<T> task) {
        bindSession();
    }

    public void bindSession() {
        this.timeoutInProgress = false;
        TransactionSynchronizationManager.bindResource(this.sessionFactory, this.sessionHolder);
    }

    @Override
    public <T> void postProcess(NativeWebRequest request, Callable<T> task, Object concurrentResult) {
        TransactionSynchronizationManager.unbindResource(this.sessionFactory);
    }

    @Override
    public <T> Object handleTimeout(NativeWebRequest request, Callable<T> task) {
        this.timeoutInProgress = true;
        return RESULT_NONE; // give other interceptors a chance to handle the timeout
    }

    @Override
    public <T> void afterCompletion(NativeWebRequest request, Callable<T> task) throws Exception {
        closeAfterTimeout();
    }

    private void closeAfterTimeout() {
        if (this.timeoutInProgress) {
            logger.debug("Closing Hibernate Session after async request timeout");
            SessionFactoryUtils.closeSession(sessionHolder.getSession());
        }
    }

    // Implementation of DeferredResultProcessingInterceptor methods

    public <T> void beforeConcurrentHandling(NativeWebRequest request, DeferredResult<T> deferredResult) {
    }

    public <T> void preProcess(NativeWebRequest request, DeferredResult<T> deferredResult) {
    }

    public <T> void postProcess(NativeWebRequest request, DeferredResult<T> deferredResult, Object result) {
    }

    @Override
    public <T> boolean handleTimeout(NativeWebRequest request, DeferredResult<T> deferredResult) {
        this.timeoutInProgress = true;
        return true; // give other interceptors a chance to handle the timeout
    }

    @Override
    public <T> void afterCompletion(NativeWebRequest request, DeferredResult<T> deferredResult) {
        closeAfterTimeout();
    }
}