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/*
* Copyright 2011-2012 Paddy Byers
*
* 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 org.meshpoint.anode;
import java.util.HashSet;
import java.util.Set;
import org.meshpoint.anode.Runtime.IllegalStateException;
import org.meshpoint.anode.Runtime.NodeException;
import org.meshpoint.anode.Runtime.StateListener;
import org.meshpoint.anode.bridge.BridgeNative;
import android.content.Context;
import android.util.Log;
public class Isolate {
private static String TAG = "anode::Isolate";
/**************************
* private state
**************************/
private Context ctx;
private long handle;
private int state;
private int exitval;
private RuntimeThread runner;
private Set<StateListener> listeners = new HashSet<StateListener>();
/**************************
* public API
**************************/
/**
* Start the Isolate.
* This is a non-blocking call.
* @param argv the command-line arguments to pass to the runtime
* @throws IllegalStateException if the runtime is already started,
* or is otherwise in a state that prevents it from starting
* @throws NodeException if the runtime exited with an error
*/
public void start(String[] argv) throws IllegalStateException, NodeException {
synchronized(runner) {
if(state != Runtime.STATE_CREATED) {
throw new IllegalStateException(
"Attempting to start Runtime when not in CREATED state"
);
}
runner.start(argv);
try{runner.wait();}catch(InterruptedException e){}
if(state == Runtime.STATE_STOPPED)
handleExitval();
}
}
/**
* Stop a running Runtime instance.
* This is a non-blocking call.
* @throws IllegalStateException if the runtime was not previously started,
* or is otherwise in a state that prevents it from being stopped
* @throws NodeException if the runtime exited with an error
*/
public void stop() throws IllegalStateException, NodeException {
synchronized(runner) {
switch(state) {
case Runtime.STATE_STARTED:
/* expected case, the instance is running normally */
setState(Runtime.STATE_STOPPING);
RuntimeNative.stop(handle, RuntimeNative.SIGKILL);
try{runner.wait();}catch(InterruptedException e){}
case Runtime.STATE_STOPPED:
/* already stopped, throw error if
* there was one, otherwise silently succeed */
handleExitval();
return;
default:
throw new IllegalStateException(
"Attempting to stop Runtime when not in STARTED state"
);
}
}
}
/**
* Get the current runtime state
* @return
*/
public int getState() {
synchronized(runner) {
return state;
}
}
/**************************
* private
**************************/
Isolate(Context ctx) {
this.ctx = ctx;
runner = new RuntimeThread();
handle = RuntimeNative.create();
state = Runtime.STATE_CREATED;
}
private void setState(int state) {
/* note that this is only ever called with the runner already locked */
this.state = state;
runner.notify();
synchronized(listeners) {
for(StateListener listener : listeners) {
listener.stateChanged(state);
}
}
}
/**
* Listener interface for being notified of state changes
*/
public void addStateListener(StateListener listener) {
synchronized(listeners) {
listeners.add(listener);
}
}
public void removeStateListener(StateListener listener) {
synchronized(listeners) {
listeners.remove(listener);
}
}
private void handleExitval() throws NodeException {
if(exitval != 0) {
/* clear exitval because we have consumed that error here */
exitval = 0;
throw new NodeException(exitval);
}
}
private class RuntimeThread extends Thread {
private String[] argv;
public void start(String[] argv) {
this.argv = argv;
super.start();
}
public void run() {
try {
Log.v(TAG, "Isolate.run(): setting context");
BridgeNative.setContext(ctx);
Log.v(TAG, "Isolate.run(): set context");
synchronized(this) {
setState(Runtime.STATE_STARTED);
}
int exitval = RuntimeNative.start(handle, argv);
synchronized(this) {
setState(Runtime.STATE_STOPPED);
Isolate.this.exitval = exitval;
}
} catch(Throwable t) {
t.printStackTrace();
}
}
}
}