/*
* 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.stratos.cartridge.agent.data.publisher.log;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.stratos.cartridge.agent.data.publisher.DataContext;
import org.apache.stratos.cartridge.agent.data.publisher.DataPublisherConfiguration;
import org.wso2.carbon.databridge.commons.StreamDefinition;
import java.io.IOException;
import java.util.Scanner;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
public class FileBasedLogPublisher extends LogPublisher implements Runnable {
private static final Log log = LogFactory.getLog(FileBasedLogPublisher.class);
private ExecutorService executorService;
private Process process;
private Scanner scanner;
public FileBasedLogPublisher(DataPublisherConfiguration dataPublisherConfig, StreamDefinition streamDefinition, String filePath, String memberId) {
super(dataPublisherConfig, streamDefinition, filePath, memberId);
this.executorService = Executors.newSingleThreadExecutor(new FileBasedLogPublisherTaskThreadFactory(filePath));
}
public void start () {
executorService.submit(this);
}
public void stop () {
// close the resources
try {
process.getInputStream().close();
} catch (IOException e) {
log.error("Error in closing [tail -F] input stream", e);
}
scanner.close();
process.destroy();
executorService.shutdownNow();
terminate();
log.info("Terminated log publisher for file: " + filePath);
}
@Override
public void run() {
Runtime r = Runtime.getRuntime();
try {
process = r.exec(Constants.TAIL_COMMAND + filePath);
} catch (IOException e) {
log.error("Error tailing file ", e);
throw new RuntimeException(e);
}
log.info("Starting log publisher for file: " + filePath + ", thread: " + Thread.currentThread().getName());
scanner = new Scanner(process.getInputStream());
while (scanner.hasNextLine()) {
DataContext dataContext = new DataContext();
// set the relevant data
dataContext.setCorrelationData(null);
dataContext.setMetaData(new Object[] {memberId});
dataContext.setPayloadData(new Object[] {scanner.nextLine()});
// publish data
publish(dataContext);
}
}
class FileBasedLogPublisherTaskThreadFactory implements ThreadFactory {
private String filePath;
public FileBasedLogPublisherTaskThreadFactory (String filePath) {
this.filePath = filePath;
}
public Thread newThread(Runnable r) {
return new Thread(r, "File based log publisher thread - " + filePath);
}
}
}