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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.protect;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* A class for interacting with the global state of the running VM.
*
* @author Steinar Knutsen
*/
public final class Process {
private static final Logger log = Logger.getLogger(Process.class.getName());
/** Die with a message, without dumping thread state */
public static void logAndDie(String message) {
logAndDie(message, null);
}
/** Die with a message, optionally dumping thread state */
public static void logAndDie(String message, boolean dumpThreads) {
logAndDie(message, null, dumpThreads);
}
/** Die with a message containing an exception, without dumping thread state */
public static void logAndDie(String message, Throwable thrown) {
logAndDie(message, thrown, false);
}
/**
* Log message as severe error, then forcibly exit runtime, without running
* exit handlers or otherwise waiting for cleanup.
*
* @param message message to log before exit
* @param thrown the throwable that caused the application to exit.
* @param dumpThreads if true the stack trace of all threads is dumped to the
* log with level info before shutting down
*/
public static void logAndDie(String message, Throwable thrown, boolean dumpThreads) {
try {
if (dumpThreads) {
log.log(Level.INFO, "About to shut down.");
dumpThreads();
}
if (thrown != null)
log.log(Level.SEVERE, message, thrown);
else
log.log(Level.SEVERE, message);
} finally {
try {
Runtime.getRuntime().halt(1);
}
catch (Throwable t) {
log.log(Level.SEVERE, "Runtime.halt rejected. Throwing an error.");
throw new ShutdownError("Shutdown requested, but failed to shut down");
}
}
}
public static void dumpThreads() {
try {
log.log(Level.INFO, "Commencing full thread dump for diagnosis.");
Map<Thread, StackTraceElement[]> allStackTraces = Thread.getAllStackTraces();
for (Map.Entry<Thread, StackTraceElement[]> e : allStackTraces.entrySet()) {
Thread t = e.getKey();
StackTraceElement[] stack = e.getValue();
StringBuilder forOneThread = new StringBuilder();
int initLen;
forOneThread.append("Stack for thread: ").append(t.getName()).append(": ");
initLen = forOneThread.length();
for (StackTraceElement s : stack) {
if (forOneThread.length() > initLen) {
forOneThread.append(" ");
}
forOneThread.append(s.toString());
}
log.log(Level.INFO, forOneThread.toString());
}
log.log(Level.INFO, "End of diagnostic thread dump.");
} catch (Exception e) {
// just give up...
}
}
@SuppressWarnings("serial")
public static class ShutdownError extends Error {
public ShutdownError(String message) {
super(message);
}
}
}
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