org.ardverk.gibson.appender.MongoAppender.java Source code

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Here is the source code for org.ardverk.gibson.appender.MongoAppender.java

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/*
 * Copyright 2012 Will Benedict, Felix Berger and Roger Kapsi
 * 
 * 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 org.ardverk.gibson.appender;

import java.util.HashSet;
import java.util.Set;

import org.apache.commons.lang.StringUtils;
import org.ardverk.gibson.Console;
import org.ardverk.gibson.Event;
import org.ardverk.gibson.Gibson;
import org.ardverk.gibson.transport.MongoTransport;
import org.ardverk.gibson.transport.Transport;
import org.slf4j.Marker;

import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.classic.spi.IThrowableProxy;
import ch.qos.logback.core.AppenderBase;

import com.mongodb.MongoURI;

/**
 * The {@link MongoAppender} sends {@link Event}s to MongoDB.
 */
public class MongoAppender extends AppenderBase<ILoggingEvent> {

    private static final Console LOG = Console.getLogger(MongoAppender.class);

    private volatile MongoURI uri = Gibson.URI;

    private volatile Transport transport = null;

    private volatile Set<String> markers = null;

    @Override
    public void start() {
        if (uri == null) {
            LOG.error(Gibson.MARKER, "Endpoint is not defined");
            return;
        }

        transport = new MongoTransport(uri);

        try {
            transport.connect();
        } catch (Exception err) {
            if (LOG.isErrorEnabled()) {
                LOG.error(Gibson.MARKER, "Failed to connect: " + uri, err);
            }

            return;
        }

        super.start();
    }

    @Override
    public void stop() {
        super.stop();

        Transport transport = this.transport;
        if (transport != null) {
            try {
                transport.close();
            } catch (Exception err) {
                LOG.error(Gibson.MARKER, "Exception", err);
            }
        }
    }

    // Called from logback.xml
    public void setUri(String uri) {
        this.uri = new MongoURI(uri);
    }

    // Called from logback.xml
    public void setMarkers(String markers) {
        if (markers != null) {
            String[] tokens = markers.split(",");

            Set<String> dst = new HashSet<String>();
            for (String token : tokens) {
                if ((token = StringUtils.trimToNull(token)) != null) {
                    dst.add(token);
                }
            }

            if (!dst.isEmpty()) {
                this.markers = dst;
            }
        }
    }

    @Override
    protected void append(ILoggingEvent evt) {
        // Make sure we're never entering a recursion if there are any problems with the appender.
        try {
            process(evt);
        } catch (Exception err) {
            LOG.error(Gibson.MARKER, "Exception", err);
        }
    }

    private void process(ILoggingEvent evt) {
        // Skip LoggingEvents that don't have a StackTrace
        IThrowableProxy proxy = evt.getThrowableProxy();
        if (proxy == null) {
            return;
        }

        Marker marker = evt.getMarker();
        if (marker != null) {
            // Skip LoggingEvents that don't have a matching Marker
            if (markers != null && markers.contains(marker.getName())) {
                return;
            }

            // Skip LoggingEvents that originate from Gibson itself.
            if (marker.equals(Gibson.MARKER)) {
                return;
            }
        }

        Transport transport = this.transport;
        if (transport != null && transport.isConnected()) {

            Event event = EventFactory.createEvent(evt);
            if (event != null) {
                transport.send(event);
            }
        }
    }
}