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The Core Camel Java DSL based router
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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.camel.processor;

import java.util.Set;

import org.apache.camel.AsyncCallback;
import org.apache.camel.AsyncProcessor;
import org.apache.camel.Exchange;
import org.apache.camel.Expression;
import org.apache.camel.Traceable;
import org.apache.camel.spi.IdAware;
import org.apache.camel.spi.LogListener;
import org.apache.camel.spi.MaskingFormatter;
import org.apache.camel.support.ServiceSupport;
import org.apache.camel.util.AsyncProcessorHelper;
import org.apache.camel.util.CamelLogger;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A processor which evaluates an {@link Expression} and logs it.
 *
 * @version 
 */
public class LogProcessor extends ServiceSupport implements AsyncProcessor, Traceable, IdAware {

    private static final Logger LOG = LoggerFactory.getLogger(LogProcessor.class);
    private String id;
    private final Expression expression;
    private final CamelLogger logger;
    private final MaskingFormatter formatter;
    private final Set listeners;

    public LogProcessor(Expression expression, CamelLogger logger, MaskingFormatter formatter, Set listeners) {
        this.expression = expression;
        this.logger = logger;
        this.formatter = formatter;
        this.listeners = listeners;
    }

    public void process(Exchange exchange) throws Exception {
        AsyncProcessorHelper.process(this, exchange);
    }

    @Override
    public boolean process(Exchange exchange, AsyncCallback callback) {
        try {
            if (logger.shouldLog()) {
                String msg = expression.evaluate(exchange, String.class);
                if (formatter != null) {
                    msg = formatter.format(msg);
                }
                msg = fireListeners(exchange, msg);
                logger.doLog(msg);
            }
        } catch (Exception e) {
            exchange.setException(e);
        } finally {
            // callback must be invoked
            callback.done(true);
        }
        return true;
    }

    private String fireListeners(Exchange exchange, String message) {
        if (listeners == null) {
            return message;
        }
        for (LogListener listener : listeners) {
            if (listener == null) {
                continue;
            }
            try {
                String output = listener.onLog(exchange, logger, message);
                message = output != null ? output : message;
            } catch (Throwable t) {
                LOG.warn("Ignoring an exception thrown by {}: {}", listener.getClass().getName(), t.getMessage());
                if (LOG.isDebugEnabled()) {
                    LOG.debug("", t);
                }
            }
        }
        return message;
    }

    @Override
    public String toString() {
        return "Log(" + logger.getLog().getName() + ")[" + expression + "]";
    }

    public String getTraceLabel() {
        return "log[" + expression + "]";
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public Expression getExpression() {
        return expression;
    }

    public CamelLogger getLogger() {
        return logger;
    }

    public MaskingFormatter getLogFormatter() {
        return formatter;
    }

    @Override
    protected void doStart() throws Exception {
        // noop
    }

    @Override
    protected void doStop() throws Exception {
        // noop
    }
}