trunk/components/camel-mina/src/main/java/org/apache/camel/component/mina/MinaHelper.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.camel.component.mina;

import org.apache.camel.CamelExchangeException;
import org.apache.camel.Exchange;
import org.apache.mina.common.IoSession;
import org.apache.mina.common.WriteFuture;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Helper class used internally by camel-mina using Apache MINA.
 */
public final class MinaHelper {

    private static final transient Logger LOG = LoggerFactory.getLogger(MinaHelper.class);

    private MinaHelper() {
        //Utility Class
    }

    /**
     * Writes the given body to MINA session. Will wait until the body has been written.
     *
     * @param session  the MINA session
     * @param body     the body to write (send)
     * @param exchange the exchange
     * @throws CamelExchangeException is thrown if the body could not be written for some reasons
     *                                (eg remote connection is closed etc.)
     */
    public static void writeBody(IoSession session, Object body, Exchange exchange) throws CamelExchangeException {
        // the write operation is asynchronous. Use WriteFuture to wait until the session has been written
        WriteFuture future = session.write(body);
        // must use a timeout (we use 10s) as in some very high performance scenarios a write can cause 
        // thread hanging forever
        if (LOG.isTraceEnabled()) {
            LOG.trace("Waiting for write to complete");
        }
        future.join(10 * 1000L);
        if (!future.isWritten()) {
            LOG.warn("Cannot write body: " + body + " using session: " + session);
            throw new CamelExchangeException("Cannot write body", exchange);
        }
    }

}