org.glassfish.appclient.client.ExitManager Maven / Gradle / Ivy
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package org.glassfish.appclient.client;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Encapsulates the logic related to intercepting exceptions
* and VM exits in a test environment and creating a disk file which records
* the results. Typically a test script would wait for the file to appear
* and then read it to find out the results of the Java Web Start launch.
*
* The report file format contains one line with the exit status value, then
* possibly additional lines containing stack trace information.
*
* The status is written to a temp file, then that file is renamed to the
* selected status file. This prevents a script waiting for the status file to
* appear from seeing the file appear before it has been written and closed and
* thereby not being able to read the status file's contents correctly.
*
* @author Tim Quinn
*/
class ExitManager implements Runnable {
private final File tempStatusFile;
private final File statusFile;
private PrintWriter reportWriter;
private CommentWriter commentWriter;
private Throwable reportedFailure = null;
private AtomicInteger reportedStatus = new AtomicInteger(0);
private static final Logger logger = Logger.getLogger(ExitManager.class.getName());
ExitManager(final String testReportLocation) {
statusFile = new File(statusFileName(testReportLocation));
tempStatusFile = new File(statusTempFileName(testReportLocation));
prepareReportWriter(tempStatusFile);
Runtime.getRuntime().addShutdownHook(new Thread(this));
logger.log(Level.FINE, "ExitManager initialized");
}
/**
* Executes when shutdown is in progress. Writes any recorded exit status
* to the status file and, if a failure has been reported, writes the
* stack trace to the file as well.
*
* The file is readable as a properties file. (The stack trace is written
* as comments.)
*/
@Override
public void run() {
logger.log(Level.FINE, "ExitManager writing output");
reportWriter.println("jws.exit.status=" + reportedStatus);
if (reportedFailure != null) {
reportedFailure.printStackTrace(commentWriter);
}
reportWriter.close();
if ( ! tempStatusFile.renameTo(statusFile)) {
throw new RuntimeException("Could not rename temp status file from " +
tempStatusFile.getAbsolutePath() + " to " +
statusFile.getAbsolutePath());
}
}
private void prepareReportWriter(final File tempTestReportFile) {
try {
reportWriter = new PrintWriter(tempTestReportFile);
commentWriter = new CommentWriter(reportWriter);
logger.log(Level.FINE, "PrintWriter for temp exit file {0} ready",
tempTestReportFile.getAbsolutePath());
} catch (IOException ex) {
throw new RuntimeException(ex);
}
}
private String statusFileName(final String testReportLocation) {
return testReportLocation + ".status";
}
private String statusTempFileName(final String testReportLocation) {
return statusFileName(testReportLocation) + ".tmp";
}
void recordFailure(final Throwable t) {
logger.log(Level.FINE, "Recording failure", t);
reportedFailure = t;
recordExit(1);
}
void recordExit(final int status) {
logger.log(Level.FINE, "Recording exit {0}", status);
reportedStatus.set(status);
}
private static class CommentWriter extends PrintWriter {
private CommentWriter(final PrintWriter delegate) {
super(delegate);
}
@Override
public void println() {
super.println();
print("#");
}
}
}