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// Copyright 2010 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.testing.junit.runner.internal;
import com.google.inject.Inject;
import sun.misc.Signal;
import sun.misc.SignalHandler;
import java.util.concurrent.atomic.AtomicReference;
/**
* Helper class to install signal handlers.
*/
public class SignalHandlers {
private final HandlerInstaller handlerInstaller;
/**
* Creates a handler installer that installs signal handlers.
*/
public static HandlerInstaller createRealHandlerInstaller() {
return new HandlerInstaller() {
@Override
public SignalHandler install(Signal signal, SignalHandler handler) {
return Signal.handle(signal, handler);
}
};
}
@Inject
public SignalHandlers(HandlerInstaller installer) {
this.handlerInstaller = installer;
}
/**
* Adds the given signal handler to the existing ones.
*
* <p>Signal handlers are responsible to catch any exception if the following
* handlers need to be executed when a handler throws an exception.
*
* @param signal The signal to handle.
* @param signalHandler The handler to install.
*/
public void installHandler(Signal signal, final SignalHandler signalHandler) {
final AtomicReference<SignalHandler> previousHandlerReference =
new AtomicReference<>();
previousHandlerReference.set(handlerInstaller.install(signal, new SignalHandler() {
@Override
public void handle(Signal signal) {
signalHandler.handle(signal);
SignalHandler previousHandler = previousHandlerReference.get();
if (previousHandler != null) {
previousHandler.handle(signal);
}
}
}));
}
/**
* Wraps sun.misc.Signal#handle(sun.misc.Signal, sun.misc.SignalHandler)
* to help with testing.
*/
public interface HandlerInstaller {
/**
* @see sun.misc.Signal#handle(sun.misc.Signal, sun.misc.SignalHandler)
*/
SignalHandler install(Signal signal, SignalHandler handler);
}
}
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