forked from bazelbuild/bazel
/
ShutdownHooks.java
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/
ShutdownHooks.java
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// Copyright 2016 The Bazel Authors. 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.
package com.google.devtools.build.lib.server;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.flogger.GoogleLogger;
import com.google.devtools.build.lib.vfs.Path;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;
import javax.annotation.concurrent.GuardedBy;
/** Wrapper for common shutdown operations. */
public class ShutdownHooks {
private static final GoogleLogger logger = GoogleLogger.forEnclosingClass();
public static ShutdownHooks createAndRegister() {
ShutdownHooks result = new ShutdownHooks();
Runtime.getRuntime().addShutdownHook(new Thread(result::runHooks));
return result;
}
@VisibleForTesting
static ShutdownHooks createUnregistered() {
return new ShutdownHooks();
}
private final AtomicBoolean enabled = new AtomicBoolean(true);
@GuardedBy("this")
private final List<Path> filesToDeleteAtExit = new ArrayList<>();
private ShutdownHooks() {}
/** Schedules the specified file for (attempted) deletion at JVM exit. */
public synchronized void deleteAtExit(Path path) {
filesToDeleteAtExit.add(path);
}
/** Disables shutdown hook execution. */
void disable() {
enabled.set(false);
}
@VisibleForTesting
void runHooks() {
if (!enabled.get()) {
return;
}
List<Path> files;
synchronized (this) {
files = new ArrayList<>(filesToDeleteAtExit);
}
for (Path path : files) {
try {
path.delete();
} catch (IOException e) {
printStack(e);
}
}
}
private static void printStack(IOException e) {
// Hopefully this never happens. It's not very nice to just write this to the user's console,
// but I'm not sure what better choice we have.
StringWriter err = new StringWriter();
PrintWriter printErr = new PrintWriter(err);
printErr.println("=======[BAZEL SERVER: ENCOUNTERED IO EXCEPTION]=======");
e.printStackTrace(printErr);
printErr.println("=====================================================");
logger.atSevere().log("%s", err);
}
}