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/*
 * $Id: MessageRequesting.java 10489 2008-01-23 17:53:38Z dfeist $
 * --------------------------------------------------------------------------------------
 * Copyright (c) MuleSource, Inc.  All rights reserved.  http://www.mulesource.com
 *
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */

package org.mule.api.transport;

import org.mule.api.MuleMessage;

/**
 * Defines generic methods for receiving events.
 * The exact behaviour of the action is defined by the implementing class.
 *
 * @see org.mule.api.endpoint.ImmutableEndpoint
 * @see MessageRequester
 */
public interface MessageRequesting
{
    
    long REQUEST_WAIT_INDEFINITELY = 0;
    long REQUEST_NO_WAIT = -1;

    /**
     * Make a specific request to the underlying transport
     *
     * @param timeout the maximum time the operation should block before returning.
     *            The call should return immediately if there is data available. If
     *            no data becomes available before the timeout elapses, null will be
     *            returned
     * @return the result of the request wrapped in a MuleMessage object. Null will be
     *         returned if no data was avaialable
     * @throws Exception if the call to the underlying protocal causes an exception
     */
    MuleMessage request(long timeout) throws Exception;

}
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