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/*
 * Copyright 2011 LMAX Ltd.
 *
 * 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 com.alipay.disruptor;

/**
 * An aggregate collection of {@link EventHandler}s that get called in sequence for each event.
 *
 * @param  event implementation storing the data for sharing during exchange or parallel coordination of an event.
 */
public final class AggregateEventHandler implements EventHandler, LifecycleAware {
    private final EventHandler[] eventHandlers;

    /**
     * Construct an aggregate collection of {@link EventHandler}s to be called in sequence.
     *
     * @param eventHandlers to be called in sequence.
     */
    public AggregateEventHandler(final EventHandler... eventHandlers) {
        this.eventHandlers = eventHandlers;
    }

    @Override
    public void onEvent(final T event, final long sequence, final boolean endOfBatch)
                                                                                     throws Exception {
        for (final EventHandler eventHandler : eventHandlers) {
            eventHandler.onEvent(event, sequence, endOfBatch);
        }
    }

    @Override
    public void onStart() {
        for (final EventHandler eventHandler : eventHandlers) {
            if (eventHandler instanceof LifecycleAware) {
                ((LifecycleAware) eventHandler).onStart();
            }
        }
    }

    @Override
    public void onShutdown() {
        for (final EventHandler eventHandler : eventHandlers) {
            if (eventHandler instanceof LifecycleAware) {
                ((LifecycleAware) eventHandler).onShutdown();
            }
        }
    }
}