/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.slider.core.main;
import sun.misc.Signal;
import sun.misc.SignalHandler;
import java.io.IOException;
/**
* This class bundles up all the compiler warnings about abuse of sun.misc
* interrupt handling code
* into one place.
*/
@SuppressWarnings("UseOfSunClasses")
public final class IrqHandler implements SignalHandler {
public static final String CONTROL_C = "INT";
public static final String SIGTERM = "TERM";
private final String name;
private final Interrupted handler;
/**
* Create an IRQ handler bound to the specific interrupt
* @param name signal name
* @param handler handler
* @throws IOException
*/
public IrqHandler(String name, Interrupted handler) throws IOException {
this.handler = handler;
this.name = name;
try {
Signal.handle(new Signal(name), this);
} catch (IllegalArgumentException e) {
throw new IOException(
"Could not set handler for signal \"" + name + "\"."
+ "This can happen if the JVM has the -Xrs set.",
e);
}
}
@Override
public String toString() {
return "IrqHandler for signal " + name ;
}
/**
* Handler for the JVM API for signal handling
* @param signal signal raised
*/
// @Override
public void handle(Signal signal) {
InterruptData data = new InterruptData(signal.getName(), signal.getNumber());
handler.interrupted(data);
}
/**
* Interrupt data to pass on.
*/
public static class InterruptData {
public final String name;
public final int number;
public InterruptData(String name, int number) {
this.name = name;
this.number = number;
}
@Override
public String toString() {
return "signal " + name + '(' + number + ')';
}
}
/**
* Callback on interruption
*/
public interface Interrupted {
/**
* Handle an interrupt
* @param interruptData data
*/
void interrupted(InterruptData interruptData);
}
}