com.comcast.viper.flume2storm.connection.sender.SimpleEventSender.java Source code

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Here is the source code for com.comcast.viper.flume2storm.connection.sender.SimpleEventSender.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.sender;

import java.util.List;

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.receptor.SimpleEventReceptor;
import com.comcast.viper.flume2storm.event.F2SEvent;
import com.comcast.viper.flume2storm.location.SimpleServiceProvider;
import com.comcast.viper.flume2storm.utility.circular.CircularList;
import com.comcast.viper.flume2storm.utility.circular.ReadWriteCircularList;

/**
 * A simple implementation of {@link EventSender} for test purpose
 */
public class SimpleEventSender extends SimpleServiceProvider implements EventSender<SimpleConnectionParameters> {
    private static final long serialVersionUID = -6829876645658796790L;
    protected static final Logger LOG = LoggerFactory.getLogger(SimpleEventSender.class);
    protected final CircularList<SimpleEventReceptor> receptors;
    protected final EventSenderStats stats;

    /**
     * @param connectionParameters
     *          See {@link #getConnectionParameters()}
     */
    public SimpleEventSender(SimpleConnectionParameters connectionParameters) {
        super(connectionParameters);
        receptors = new ReadWriteCircularList<SimpleEventReceptor>();
        stats = new EventSenderStats(connectionParameters.getId());
        LOG.debug("Created with {}", connectionParameters);
    }

    /**
     * @see com.comcast.viper.flume2storm.connection.sender.EventSender#start()
     */
    @Override
    public boolean start() {
        LOG.info("Sender '{}' started", getConnectionParameters().getId());
        SimpleEventSenderRouter.getInstance().add(this);
        return true;
    }

    /**
     * @see com.comcast.viper.flume2storm.connection.sender.EventSender#stop()
     */
    @Override
    public boolean stop() {
        LOG.info("Sender '{}' stopped", getConnectionParameters().getId());
        SimpleEventSenderRouter.getInstance().remove(this);
        return true;
    }

    /**
     * Method called by the SimpleEventReceptor to connect the EventSender
     * 
     * @param receptor
     *          The receptor that is connecting
     */
    public void connect(SimpleEventReceptor receptor) {
        LOG.info("Sender '{}' received connection from {}", getConnectionParameters().getId(), receptor);
        if (receptors.add(receptor))
            stats.incrClients();
    }

    /**
     * Method called by the SimpleEventReceptor to disconnect the EventSender
     * 
     * @param receptor
     *          The receptor that is connecting
     */
    public void disconnect(SimpleEventReceptor receptor) {
        LOG.info("Sender '{}' received disconnection from {}", getConnectionParameters().getId(), receptor);
        if (receptors.remove(receptor))
            stats.decrClients();
    }

    /**
     * Load-balances the events to send between the receptor connected
     * 
     * @see com.comcast.viper.flume2storm.connection.sender.EventSender#send(java.util.List)
     */
    @Override
    public int send(List<F2SEvent> events) {
        LOG.trace("Sender '{}' sending {} events", getConnectionParameters().getId(), events.size());
        stats.incrEventsIn(events.size());
        int result = 0;
        for (F2SEvent f2sEvent : events) {
            SimpleEventReceptor receptor = receptors.getNext();
            if (receptor == null) {
                // No more receptor connected
                break;
            }
            receptor.receive(f2sEvent);
            result++;
        }
        stats.incrEventsOut(result);
        LOG.debug("Sender '{}' sent {} events successfully", getConnectionParameters().getId(), result);
        return result;
    }

    /**
     * @see com.comcast.viper.flume2storm.connection.sender.EventSender#getStats()
     */
    public EventSenderStats getStats() {
        return stats;
    }

    /**
     * @see com.comcast.viper.flume2storm.location.SimpleServiceProvider#toString()
     */
    public String toString() {
        return new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE)
                .append("connectionParameters", getConnectionParameters()).append("stats", stats).build();
    }
}