com.adeptj.runtime.websocket.ServerLogsTailer.java Source code

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Here is the source code for com.adeptj.runtime.websocket.ServerLogsTailer.java

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/*
###############################################################################
#                                                                             #
#    Copyright 2016, AdeptJ (http://www.adeptj.com)                           #
#                                                                             #
#    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 com.adeptj.runtime.websocket;

import com.adeptj.runtime.common.DefaultExecutorService;
import com.adeptj.runtime.config.Configs;
import org.apache.commons.io.input.Tailer;

import javax.websocket.Session;
import java.nio.file.Paths;

/**
 * Tails server log using Apache Commons IO {@link Tailer}.
 *
 * @author Rakesh.Kumar, AdeptJ
 */
class ServerLogsTailer {

    private static final String SERVER_LOG_FILE = "server-log-file";

    /**
     * The delay between checks of the file for new content in milliseconds.
     */
    private static final int DELAY_MILLIS = Integer.getInteger("websocket.logs.tailing.delay", 1000);

    /**
     * The commons {@link Tailer}
     */
    private Tailer tailer;

    private ServerLogsTailerListener tailerListener;

    ServerLogsTailer(Session session) {
        this.tailerListener = new ServerLogsTailerListener();
        this.tailerListener.setWebSocketSession(session);
        this.tailer = Tailer.create(Paths.get(Configs.of().logging().getString(SERVER_LOG_FILE)).toFile(),
                this.tailerListener, DELAY_MILLIS, true);
    }

    void startTailer() {
        DefaultExecutorService.getInstance().execute(this.tailer);
    }

    void stopTailer() {
        this.tailer.stop();
        this.tailerListener.setWebSocketSession(null);
        this.tailerListener = null;
        this.tailer = null;
    }
}