com.codio.collab.core.queue.DocumentRequestPerformer.java Source code

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Here is the source code for com.codio.collab.core.queue.DocumentRequestPerformer.java

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/**
 * Copyright Suchkov Dmitrii
 *
 * 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.codio.collab.core.queue;

import com.codio.collab.core.Context;
import com.codio.collab.core.interfaces.BackendProcessor;
import com.codio.collab.core.interfaces.DocumentPerformer;
import com.codio.collab.core.types.DocumentMessage;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.QueueingConsumer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;

public class DocumentRequestPerformer implements Runnable, DocumentPerformer {

    private static final Logger LOG = LoggerFactory.getLogger(DocumentRequestPerformer.class);

    private QueueingConsumer consumer;
    private BackendProcessor backendProcessor;
    private boolean isStopped = false;
    private Channel channel;

    public DocumentRequestPerformer(final Connection connection, final String name,
            final BackendProcessor backendProcessor) {
        this.backendProcessor = backendProcessor;
        try {
            channel = connection.createChannel();
            channel.basicQos(1);
            consumer = new QueueingConsumer(channel);

            channel.basicConsume(name, false, consumer);
        } catch (IOException e) {
            LOG.error("Problem with init document consumer = {}, {}", e.getMessage(), e);
        }
    }

    @Override
    public void run() {

        while (!isStopped()) {
            try {
                QueueingConsumer.Delivery delivery = consumer.nextDelivery(1000);
                if (delivery == null) {
                    continue;
                }

                long tag = delivery.getEnvelope().getDeliveryTag();
                try {
                    final String msg = new String(delivery.getBody());
                    LOG.debug("Process message = {}", msg);
                    DocumentMessage message = Context.getMapper().readValue(msg.getBytes(), DocumentMessage.class);
                    backendProcessor.processDocumentMessage(message, tag, this);
                } catch (Exception ex) {
                    channel.basicAck(tag, false);
                }
            } catch (Exception e) {
                LOG.error("Error in rmq process = {}, {}, {}", e.getMessage(), e.getStackTrace(), e);
            }
        }

    }

    public void ackDocumentMessage(final long tag) {
        try {
            channel.basicAck(tag, false);
        } catch (IOException e) {
            LOG.error("ack problem {}", e);
        }
    }

    public boolean isStopped() {
        return isStopped;
    }

    public void setStopped(boolean isStopped) {
        this.isStopped = isStopped;
    }

}