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/*-
* ============LICENSE_START==========================================
* OPENECOMP - DCAE
* ===================================================================
* Copyright (c) 2017 AT&T Intellectual Property. All rights reserved.
* ===================================================================
* 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.
* ============LICENSE_END============================================
*/
package org.openecomp.ncomp.utils.extra;
import java.io.File;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Set;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.json.JSONObject;
import org.openecomp.ncomp.utils.FindFiles;
import org.openecomp.ncomp.utils.FindFiles.ParameterizedFile;
import org.openecomp.ncomp.utils.journaling.JournalingHashMap;
import org.openecomp.ncomp.utils.logging.LoggingUtils;
import org.openecomp.ncomp.webservice.utils.DateUtils;
public class FileTail {
public static final Logger logger = Logger.getLogger(FileTail.class);
private String format;
private String directory;
private NewLineHandler handler;
private long checkFrequency = 60000; // milliseconds
private long checkNewFrequency = 300000; // milliseconds
private JournalingHashMap<Long> filePointerMap;
private long scanDuration = DateUtils.stringToDuration("2day");
private Object context;
public interface NewLineHandler {
void newLine(String file, String line, Object context);
void fixFilePermissions(File file);
}
@SuppressWarnings("unchecked")
public FileTail(String format, String directory, String scanFreq, String scanNewFreq, String scanDuration, NewLineHandler handler, Object context) {
super();
if (scanFreq != null)
checkFrequency = DateUtils.stringToDuration(scanFreq);
if (scanNewFreq != null)
checkNewFrequency = DateUtils.stringToDuration(scanNewFreq);
if (scanDuration != null)
this.scanDuration = DateUtils.stringToDuration(scanDuration);
this.format = format;
this.directory = directory;
this.handler = handler;
this.context = context;
filePointerMap = JournalingHashMap.create(new File(directory));
logger.info("initial status: " + getStatus().toString(2));
logger.info("Created: " + this);
new MonitorThread(format);
}
@SuppressWarnings("unchecked")
public FileTail(String filename, String directory, String scanFreq, NewLineHandler handler, Object context) {
if (scanFreq != null)
checkFrequency = DateUtils.stringToDuration(scanFreq);
this.directory = directory;
this.handler = handler;
this.context = context;
filePointerMap = JournalingHashMap.create(new File(directory));
if (filePointerMap.get(filename) == null) {
filePointerMap.put(filename, 0L);
}
new MonitorThread(filename);
}
@Override
public String toString() {
return "FileTail [format=" + format + ", directory=" + directory + ", checkFrequency="
+ checkFrequency + ", checkNewFrequency=" + checkNewFrequency + "]";
}
private class MonitorThread implements Runnable {
public MonitorThread(String name) {
Thread t = new Thread(this, "filetail: " + name);
t.start();
}
@Override
public void run() {
long numIntervalsPerNewFileCheck = checkNewFrequency / checkFrequency;
long i = 0;
while (true) {
if ((i++ % numIntervalsPerNewFileCheck) == 0)
scanForNewFiles();
scanForNewLines();
try {
Thread.sleep(checkFrequency);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
return;
}
}
}
}
private void scanForNewFiles() {
if (format == null) return;
FindFiles ff = new FindFiles(format);
Date now = new Date();
HashMap<String, Long> map = new HashMap<String, Long>();
synchronized (this) {
for (ParameterizedFile f : ff.findFiles()) {
File f1 = new File(f.getFile());
if (f1.lastModified() + scanDuration < now.getTime()) continue;
if (filePointerMap.get(f.getFile()) == null) {
map.put(f.getFile(), 0L);
filePointerMap.put(f.getFile(), 0L);
logger.info("Found new file: " + f.getFile());
} else {
map.put(f.getFile(), filePointerMap.get(f.getFile()));
}
}
List<String> remove = new ArrayList<String>();
for (String f : filePointerMap.keySet()) {
if (map.get(f) == null) {
logger.info("Deleted file: " + f);
remove.add(f);
}
}
for (String f : remove) filePointerMap.remove(f);
filePointerMap.save();
}
}
private void scanForNewLines() {
logger.info("old status: " + getStatus().toString(2));
Set<String> files = filePointerMap.keySet();
for (String f : files) {
try {
long p;
synchronized (this) {
p = filePointerMap.get(f);
}
File file = new File(f);
long len = file.length();
if (len == p)
continue;
if (len < p) {
logger.info("Logfile reset. Restarted at start");
p = 0;
}
if (len > p) {
if (!file.canRead()) {
handler.fixFilePermissions(file);
}
if (!file.canRead()) {
LoggingUtils.dampingLogger(logger, Level.WARN, "Unable to read: " + file.getAbsolutePath());
continue;
}
RandomAccessFile rf = new RandomAccessFile(file, "r");
rf.seek(p);
String line = null;
while ((line = rf.readLine()) != null) {
if (line.length() == 0)
continue;
if (logger.isDebugEnabled())
logger.debug("New line from file: " + f + " " + line);
p = rf.getFilePointer();
try {
handler.newLine(file.getAbsolutePath(),line,context);
} catch (Exception e) {
logger.warn("Handler error: " + f + " " + e + " line=" + line);
e.printStackTrace();
}
}
rf.close();
}
synchronized (this) {
filePointerMap.put(f, p);
filePointerMap.save();
}
} catch (Exception e) {
e.printStackTrace(System.out);
logger.error("Scaning error: " + f + " " + e);
}
}
logger.info("new status: " + getStatus().toString(2));
}
public JSONObject getStatus() {
JSONObject o = new JSONObject();
synchronized (this) {
for (String f : filePointerMap.keySet()) {
o.put(f, filePointerMap.get(f));
}
}
return o;
}
}
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