org.apache.giraph.utils.LoggerUtils.java Source code

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Here is the source code for org.apache.giraph.utils.LoggerUtils.java

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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.giraph.utils;

import java.io.IOException;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;

/**
 * Logger utils for log4j
 */
public class LoggerUtils {
    /**
     * Don't construct this.
     */
    private LoggerUtils() {
    }

    /**
     * Helper method to set the status and log message together if condition
     * has been been met.
     *
     * @param condition Must be true to write status and log
     * @param context Context to set the status with
     * @param logger Logger to write to
     * @param level Level of logging
     * @param message Message to set status with
     */
    public static void conditionalSetStatusAndLog(boolean condition, TaskAttemptContext context, Logger logger,
            Level level, String message) {
        if (condition) {
            setStatusAndLog(context, logger, level, message);
        }
    }

    /**
     * Helper method to set the status and log message together.
     *
     * @param context Context to set the status with
     * @param logger Logger to write to
     * @param level Level of logging
     * @param message Message to set status with
     */
    public static void setStatusAndLog(TaskAttemptContext context, Logger logger, Level level, String message) {
        try {
            setStatus(context, message);
        } catch (IOException e) {
            throw new IllegalStateException("setStatusAndLog: Got IOException", e);
        }
        if (logger.isEnabledFor(level)) {
            logger.log(level, message);
        }
    }

    /**
     * Set Hadoop status message.
     *
     * NOTE: In theory this function could get folded in to the callsites, but
     * the issue is that some Hadoop jars, e.g. 0.23 and 2.0.0, don't actually
     * throw IOException on setStatus while others do. This makes wrapping it in a
     * try/catch cause a compile error on those Hadoops. With this function every
     * caller sees a method that throws IOException. In case it doesn't actually,
     * there is no more compiler error because not throwing a decalred exception
     * is at best a warning.
     *
     * @param context Context to set the status with
     * @param message Message to set status with
     * @throws IOException If something goes wrong with setting status message
     */
    private static void setStatus(TaskAttemptContext context, String message) throws IOException {
        context.setStatus(message);
    }
}