/*
 * 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.ignite.logger.log4j;

import java.io.IOException;
import org.apache.ignite.internal.util.typedef.internal.A;
import org.apache.ignite.lang.IgniteClosure;
import org.apache.log4j.FileAppender;
import org.apache.log4j.Layout;

/**
 * Log4J {@link FileAppender} with added support for grid node IDs.
 */
public class Log4JFileAppender extends FileAppender implements Log4jFileAware {
    /** Basic log file name. */
    private String baseFileName;

    /**
     * Default constructor (does not do anything).
     */
    public Log4JFileAppender() {
        init();
    }

    /**
     * Instantiate a FileAppender with given parameters.
     *
     * @param layout Layout.
     * @param filename File name.
     * @throws IOException If failed.
     */
    public Log4JFileAppender(Layout layout, String filename) throws IOException {
        super(layout, filename);

        init();
    }

    /**
     * Instantiate a FileAppender with given parameters.
     *
     * @param layout Layout.
     * @param filename File name.
     * @param append Append flag.
     * @throws IOException If failed.
     */
    public Log4JFileAppender(Layout layout, String filename, boolean append) throws IOException {
        super(layout, filename, append);

        init();
    }

    /**
     * Instantiate a FileAppender with given parameters.
     *
     * @param layout Layout.
     * @param filename File name.
     * @param append Append flag.
     * @param bufIO Buffered IO flag.
     * @param bufSize Buffer size.
     * @throws IOException If failed.
     */
    public Log4JFileAppender(Layout layout, String filename, boolean append, boolean bufIO, int bufSize)
        throws IOException {
        super(layout, filename, append, bufIO, bufSize);

        init();
    }

    /**
     *
     */
    private void init() {
        Log4JLogger.addAppender(this);
    }

    /** {@inheritDoc} */
    @Override public synchronized void setFile(String fileName, boolean fileAppend, boolean bufIO, int bufSize)
        throws IOException {
        if (baseFileName != null)
            super.setFile(fileName, fileAppend, bufIO, bufSize);
    }

    /** {@inheritDoc} */
    @Override public synchronized void updateFilePath(IgniteClosure<String, String> filePathClos) {
        A.notNull(filePathClos, "filePathClos");

        if (baseFileName == null)
            baseFileName = fileName;

        fileName = filePathClos.apply(baseFileName);
    }
}