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/*******************************************************************************
 * Copyright 2012 Anteros Tecnologia
 *  
 * 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 br.com.anteros.spring.web.support;

import java.util.concurrent.Callable;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
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 br.com.anteros.persistence.session.SQLSessionFactory;
import br.com.anteros.spring.transaction.SQLSessionFactoryUtils;
import br.com.anteros.spring.transaction.SQLSessionHolder;

/**
 * 
 * @author Edson Martins [email protected]
 *
 */
class AsyncRequestInterceptor extends CallableProcessingInterceptorAdapter
		implements DeferredResultProcessingInterceptor {

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

	private final SQLSessionFactory sessionFactory;

	private final SQLSessionHolder sessionHolder;

	private volatile boolean timeoutInProgress;


	public AsyncRequestInterceptor(SQLSessionFactory sessionFactory, SQLSessionHolder sessionHolder) {
		this.sessionFactory = sessionFactory;
		this.sessionHolder = sessionHolder;
	}

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

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

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

	@Override
	public  Object handleTimeout(NativeWebRequest request, Callable task) {
		this.timeoutInProgress = true;
		return RESULT_NONE; 
	}

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

	private void closeAfterTimeout() {
		if (this.timeoutInProgress) {
			logger.debug("Closing Anteros SQLSession after async request timeout");
			SQLSessionFactoryUtils.closeSession(sessionHolder.getSession());
		}
	}

	public  void beforeConcurrentHandling(NativeWebRequest request, DeferredResult deferredResult) {}
	public  void preProcess(NativeWebRequest request, DeferredResult deferredResult) {}
	public  void postProcess(NativeWebRequest request, DeferredResult deferredResult, Object result) {}

	@Override
	public  boolean handleTimeout(NativeWebRequest request, DeferredResult deferredResult) {
		this.timeoutInProgress = true;
		return true; 
	}

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

}