SqsAppender.java

package org.eluder.logback.ext.sqs.appender;

/*
 * #[license]
 * logback-ext-sqs-appender
 * %%
 * Copyright (C) 2014 - 2015 Tapio Rautonen
 * %%
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * %[license]
 */

import ch.qos.logback.core.filter.Filter;
import ch.qos.logback.core.spi.DeferredProcessingAware;
import com.amazonaws.services.sqs.AmazonSQSAsyncClient;
import com.amazonaws.services.sqs.model.SendMessageRequest;
import com.amazonaws.services.sqs.model.SendMessageResult;
import org.eluder.logback.ext.aws.core.AbstractAwsEncodingStringAppender;
import org.eluder.logback.ext.aws.core.AwsSupport;
import org.eluder.logback.ext.aws.core.LoggingEventHandler;
import org.eluder.logback.ext.core.AppenderExecutors;
import org.eluder.logback.ext.core.StringPayloadConverter;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executors;

import static java.lang.String.format;

public class SqsAppender<E extends DeferredProcessingAware> extends AbstractAwsEncodingStringAppender<E, String> {

    private String queueUrl;

    private AmazonSQSAsyncClient sqs;

    public SqsAppender() {
        super();
    }

    protected SqsAppender(AwsSupport awsSupport, Filter<E> sdkLoggingFilter) {
        super(awsSupport, sdkLoggingFilter);
    }

    public final void setQueueUrl(String queueUrl) {
        this.queueUrl = queueUrl;
    }

    @Override
    public void start() {
        if (queueUrl == null) {
            addError(format("Queue url not set for appender '%s'", getName()));
            return;
        }
        setConverter(new StringPayloadConverter(getCharset(), isBinary()));
        super.start();
    }

    @Override
    protected void doStart() {
        sqs = new AmazonSQSAsyncClient(
                getCredentials(),
                getClientConfiguration(),
                Executors.newFixedThreadPool(getThreadPoolSize())
        );
        sqs.setEndpoint(getEndpoint());
    }

    @Override
    protected void doStop() {
        if (sqs != null) {
            AppenderExecutors.shutdown(this, sqs.getExecutorService(), getMaxFlushTime());
            sqs.shutdown();
            sqs = null;
        }
    }

    protected String getEndpoint() {
        try {
            return new URI(queueUrl).getHost();
        } catch (URISyntaxException ex) {
            throw new IllegalArgumentException("Malformed queue url", ex);
        }
    }

    @Override
    protected void handle(final E event, final String encoded) throws Exception {
        SendMessageRequest request = new SendMessageRequest(queueUrl, encoded);
        String errorMessage = format("Appender '%s' failed to send logging event '%s' to SQS queue '%s'", getName(), event, queueUrl);
        CountDownLatch latch = new CountDownLatch(isAsyncParent() ? 0 : 1);
        sqs.sendMessageAsync(request, new LoggingEventHandler<SendMessageRequest, SendMessageResult>(this, latch, errorMessage));
        AppenderExecutors.awaitLatch(this, latch, getMaxFlushTime());
    }

}