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/**
 * 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 net.logstash.logback.appender;

import java.util.Iterator;
import java.util.concurrent.BlockingQueue;

import org.apache.juli.logging.ch.qos.logback.access.spi.IAccessEvent;
import org.apache.juli.logging.ch.qos.logback.classic.spi.ILoggingEvent;
import org.apache.juli.logging.ch.qos.logback.core.Appender;
import org.apache.juli.logging.ch.qos.logback.core.AsyncAppenderBase;
import org.apache.juli.logging.ch.qos.logback.core.spi.AppenderAttachable;
import org.apache.juli.logging.ch.qos.logback.core.spi.AppenderAttachableImpl;
import org.apache.juli.logging.ch.qos.logback.core.spi.DeferredProcessingAware;

import com.lmax.disruptor.EventHandler;
import com.lmax.disruptor.RingBuffer;

/**
 * An {@link AsyncDisruptorAppender} that delegates appending of an event
 * to delegate {@link #appenders}.
 * 
 * This is very similar to logback's {@link AsyncAppenderBase}, except that:
 * 
 * it uses a {@link RingBuffer} instead of a {@link BlockingQueue}
 * it allows any number of delegate appenders, instead of just one
 * 
 *
 * @param  type of event ({@link ILoggingEvent} or {@link IAccessEvent}).
 */
public abstract class DelegatingAsyncDisruptorAppender extends AsyncDisruptorAppender implements AppenderAttachable {
    
    /**
     * The delegate appenders.
     */
    private final AppenderAttachableImpl appenders = new AppenderAttachableImpl();
    
    private class DelegatingEventHandler implements EventHandler> {
        
        @Override
        public void onEvent(LogEvent logEvent, long sequence, boolean endOfBatch) throws Exception {
            appenders.appendLoopOnAppenders(logEvent.event);
        }
        
    }
    
    public DelegatingAsyncDisruptorAppender() {
        super();
        setEventHandler(new DelegatingEventHandler());
    }
    
    @Override
    public void start() {
        startDelegateAppenders();
        super.start();
    }
    
    @Override
    public void stop() {
        if (!isStarted()) {
            return;
        }
        super.stop();
        stopDelegateAppenders();
    }

    private void startDelegateAppenders() {
        for (Iterator> appenderIter = appenders.iteratorForAppenders(); appenderIter.hasNext();) {
            Appender appender = appenderIter.next();
            if (appender.getContext() == null) {
                appender.setContext(getContext());
            }
            if (!appender.isStarted()) {
                appender.start();
            }
        }
    }

    private void stopDelegateAppenders() {
        for (Iterator> appenderIter = appenders.iteratorForAppenders(); appenderIter.hasNext();) {
            Appender appender = appenderIter.next();
            if (appender.isStarted()) {
                appender.stop();
            }
        }
    }

    @Override
    public void addAppender(Appender newAppender) {
        appenders.addAppender(newAppender);
    }

    @Override
    public Iterator> iteratorForAppenders() {
        return appenders.iteratorForAppenders();
    }

    @Override
    public Appender getAppender(String name) {
        return appenders.getAppender(name);
    }

    @Override
    public boolean isAttached(Appender appender) {
        return appenders.isAttached(appender);
    }

    @Override
    public void detachAndStopAllAppenders() {
        appenders.detachAndStopAllAppenders();
    }

    @Override
    public boolean detachAppender(Appender appender) {
        return appenders.detachAppender(appender);
    }

    @Override
    public boolean detachAppender(String name) {
        return appenders.detachAppender(name);
    }

}