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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.protect;
import com.sun.management.HotSpotDiagnosticMXBean;
import javax.management.MBeanServer;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
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 AtomicBoolean alreadyShuttingDown = new AtomicBoolean(false);
private static final AtomicBoolean busyDumpingThreads = new AtomicBoolean(false);
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) {
boolean shutDownInProgress = alreadyShuttingDown.getAndSet(true);
try {
if (thrown != null) {
log.log(Level.SEVERE, message, thrown);
} else {
log.log(Level.SEVERE, message);
}
log.log(Level.INFO, "About to shut down.");
if (dumpThreads) {
dumpThreads();
}
} finally {
if ( ! shutDownInProgress ) {
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");
}
} else {
log.log(Level.WARNING, "Shutdown already in progress. Will just let death come upon us normally.");
}
}
}
public static void dumpHeap(String filePath, boolean live) {
log.log(Level.INFO, "Will dump the heap to '" + filePath + "', with the live = " + live);
try {
getHotspotMXBean().dumpHeap(filePath, live);
} catch (IOException e) {
log.log(Level.WARNING, "Failed writing heap dump:", e);
}
}
private static HotSpotDiagnosticMXBean getHotspotMXBean() throws IOException {
MBeanServer server = ManagementFactory.getPlatformMBeanServer();
return ManagementFactory.newPlatformMXBeanProxy(
server, "com.sun.management:type=HotSpotDiagnostic", HotSpotDiagnosticMXBean.class);
}
public static void dumpThreads() {
boolean alreadyDumpingThreads = busyDumpingThreads.getAndSet(true);
if ( ! alreadyDumpingThreads ) {
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();
forOneThread.append("Stack for thread: ").append(t.getName()).append(" ").append(t.isDaemon() ? "DAEMON" : "NON-DAEMON").append(": ");
for (StackTraceElement s : stack) {
forOneThread.append('\n').append(s.toString());
}
log.log(Level.INFO, forOneThread.toString());
}
log.log(Level.INFO, "End of diagnostic thread dump.");
} catch (Exception e) {
// just give up...
}
busyDumpingThreads.set(false);
} else {
log.log(Level.WARNING, "Thread dump already in progress. Skipping it.");
}
}
@SuppressWarnings("serial")
public static class ShutdownError extends Error {
public ShutdownError(String message) {
super(message);
}
}
}
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