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* and Distribution License("CDDL") (collectively, the "License"). You
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* file and include the License file at LICENSE.txt.
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* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
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* Modifications:
* If applicable, add the following below the License Header, with the fields
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package admin.util;
import java.io.*;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* A simple class designed to check on new logged messages. When you create it
* it automatically sets the file pointer to the end of the log-file. Then you
* can call the NON-BLOCKING method, getLatest() to see the latest stuff written
* since your last check. Created May 27, 2011
*
* @author Byron Nevins
*/
public class LogListener {
public static void main(String[] args) {
LogListener ll = new LogListener("domain1");
System.out.println("LogListener Main");
System.out.println("length() returned: " + ll.length());
while (true) {
String s = ll.getLatest();
if (s.length() > 0)
System.out.println("\nLATEST: [[[" + s + "]]]");
else
System.out.print(".");
try {
Thread.sleep(1000);
}
catch (InterruptedException ex) {
System.exit(0);
}
}
}
public LogListener() {
this("domain1");
}
public LogListener(String domainName) {
if (domainName == null || domainName.isEmpty())
domainName = "domain1";
RandomAccessFile di = null; // so reader can be final
File f = null;
try {
// for filelayout change
f = new File(new File(System.getenv("S1AS_HOME")),
"domains/" + domainName + "/server/logs/server.log");
if(!f.exists())
f = new File(new File(System.getenv("S1AS_HOME")),
"domains/" + domainName + "/logs/server.log");
di = new RandomAccessFile(f, "rws");
di.seek(f.length());
}
catch (Exception ex) {
di = null;
f = null;
}
reader = di;
logfile = f;
}
public String getLatest(int secondsToWait) {
try {
Thread.sleep(1000 * secondsToWait);
return getLatest();
}
catch (InterruptedException ex) {
return "";
}
}
public void close() {
try {
if (reader != null)
reader.close();
}
catch (IOException ex) {
// nothing to do
}
}
public String getLatest() {
try {
long cur = length();
long ptr = reader.getFilePointer();
long numNew = cur - reader.getFilePointer() - 1;
if (numNew == 0)
return "";
if (numNew < 0) {
if (cur <= 1)
reader.seek(0);
else
reader.seek(cur - 1);
return "";
}
byte[] bytes = new byte[(int) numNew];
reader.read(bytes);
return new String(bytes);
}
catch (IOException ex) {
return "";
}
}
public final File getFile() {
return logfile;
}
private long length() {
return logfile.length();
}
private final File logfile;
private final RandomAccessFile reader;
}