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Excalibur Event API

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/* 
 * 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.excalibur.event.command;

import org.apache.excalibur.event.EventHandler;
import org.apache.excalibur.event.Source;

/**
 * An EventPipeline is used by the ThreadManager to manage the event Queue
 * and EventHandler relationship.  The ThreadManager manages the automatic
 * forwarding of the Events from the queue to the Event Handler.
 *
 * 
 *   The interface design is heavily influenced by
 *   Matt Welsh's SandStorm server,
 *   his demonstration of the SEDA architecture.  We have deviated where we
 *   felt the design differences where better.
 * 
 *
 * @author Avalon Development Team
 */
public interface EventPipeline
{
    /**
     * There can be many different sources to merge into a pipeline.  For the
     * CommandManager, there is only one sink.
     *
     * @return the array of sources that feed the handler
     */
    Source[] getSources();

    /**
     * Returns the reference to the EventHandler that the events from all the
     * Sinks get merged into.
     *
     * @return the handler for the pipeline
     */
    EventHandler getEventHandler();
}