com.comcast.viper.flume2storm.connection.receptor.SimpleEventReceptor.java Source code

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Here is the source code for com.comcast.viper.flume2storm.connection.receptor.SimpleEventReceptor.java

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/**
 * Copyright 2014 Comcast Cable Communications Management, LLC
 *
 * 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.comcast.viper.flume2storm.connection.receptor;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;

import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.comcast.viper.flume2storm.connection.parameters.SimpleConnectionParameters;
import com.comcast.viper.flume2storm.connection.sender.EventSender;
import com.comcast.viper.flume2storm.connection.sender.SimpleEventSender;
import com.comcast.viper.flume2storm.connection.sender.SimpleEventSenderRouter;
import com.comcast.viper.flume2storm.event.F2SEvent;

/**
 * An implementation of the {@link EventReceptor} for test purpose
 */
public class SimpleEventReceptor implements EventReceptor<SimpleConnectionParameters> {
    protected static final Logger LOG = LoggerFactory.getLogger(SimpleEventReceptor.class);
    protected final Queue<F2SEvent> events;
    protected final SimpleConnectionParameters connectionParameters;
    protected final EventReceptorStats stats;

    /**
     * @param connectionParameters
     *          The connections parameters to use to connect the
     *          {@link EventSender}
     */
    public SimpleEventReceptor(SimpleConnectionParameters connectionParameters) {
        events = new LinkedList<F2SEvent>();
        this.connectionParameters = connectionParameters;
        stats = new EventReceptorStats(connectionParameters.getId());
        LOG.debug("Created with {}", connectionParameters);
    }

    /**
     * @see com.comcast.viper.flume2storm.connection.receptor.EventReceptor#getConnectionParameters()
     */
    @Override
    public SimpleConnectionParameters getConnectionParameters() {
        return connectionParameters;
    }

    /**
     * @see com.comcast.viper.flume2storm.connection.receptor.EventReceptor#start()
     */
    @Override
    public boolean start() {
        SimpleEventSender eventSender = SimpleEventSenderRouter.getInstance().get(connectionParameters);
        if (eventSender != null) {
            System.out.println("Connecting to " + eventSender);
            eventSender.connect(this);
            stats.setConnected();
        }
        LOG.info("Receptor of '{}' started and connected to {}", connectionParameters.getId(), eventSender);
        return true;
    }

    /**
     * @see com.comcast.viper.flume2storm.connection.receptor.EventReceptor#stop()
     */
    @Override
    public boolean stop() {
        SimpleEventSender eventSender = SimpleEventSenderRouter.getInstance().get(connectionParameters);
        if (eventSender != null) {
            System.out.println("Disconnecting from " + eventSender);
            eventSender.disconnect(this);
            stats.setDisconnected();
        }
        LOG.info("Receptor of '{}' stopped and disconnected from {}", connectionParameters.getId(), eventSender);
        return true;
    }

    /**
     * @see com.comcast.viper.flume2storm.connection.receptor.EventReceptor#getStats()
     */
    public EventReceptorStats getStats() {
        return stats;
    }

    /**
     * @see com.comcast.viper.flume2storm.connection.receptor.EventReceptor#getEvents()
     */
    @Override
    public List<F2SEvent> getEvents() {
        return getEvents(Integer.MAX_VALUE);
    }

    /**
     * @see com.comcast.viper.flume2storm.connection.receptor.EventReceptor#getEvents(int)
     */
    @Override
    public List<F2SEvent> getEvents(int maxEvents) {
        final List<F2SEvent> result = new ArrayList<F2SEvent>();
        for (int i = 0; i < maxEvents; i++) {
            final F2SEvent e = events.poll();
            if (e == null) {
                break;
            }
            stats.decrEventsQueued();
            result.add(e);
        }
        return result;
    }

    /**
     * Method called by the {@link EventSender} to simulate sending a Flume2Storm
     * event
     * 
     * @param event
     *          The event to receive
     */
    public void receive(F2SEvent event) {
        stats.incrEventsIn();
        if (events.add(event))
            stats.incrEventsQueued();
        LOG.trace("Receptor of '{}' received an event", connectionParameters.getId());
    }

    /**
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        return new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE)
                .append("connectionParameters", connectionParameters).append("stats", stats).build();
    }
}