/* Copyright (c) 2010, Carl Burch. License information is located in the
* com.cburch.logisim.Main source code and at www.cburch.com/logisim/. */
package com.cburch.logisim.tools.move;
import com.cburch.logisim.circuit.ReplacementMap;
class ConnectorThread extends Thread {
private static ConnectorThread INSTANCE = new ConnectorThread();
static {
INSTANCE.start();
}
public static void enqueueRequest(MoveRequest req, boolean priority) {
synchronized (INSTANCE.lock) {
if (!req.equals(INSTANCE.processingRequest)) {
INSTANCE.nextRequest = req;
INSTANCE.overrideRequest = priority;
INSTANCE.lock.notifyAll();
}
}
}
public static boolean isOverrideRequested() {
return INSTANCE.overrideRequest;
}
private Object lock;
private transient boolean overrideRequest;
private MoveRequest nextRequest;
private MoveRequest processingRequest;
private ConnectorThread() {
lock = new Object();
overrideRequest = false;
nextRequest = null;
}
public boolean isAbortRequested() {
return overrideRequest;
}
@Override
public void run() {
while (true) {
MoveRequest req;
boolean wasOverride;
synchronized (lock) {
processingRequest = null;
while (nextRequest == null) {
try {
lock.wait();
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
return;
}
}
req = nextRequest;
wasOverride = overrideRequest;
nextRequest = null;
overrideRequest = false;
processingRequest = req;
}
try {
MoveResult result = Connector.computeWires(req);
if (result != null) {
MoveGesture gesture = req.getMoveGesture();
gesture.notifyResult(req, result);
}
} catch (Throwable t) {
t.printStackTrace();
if (wasOverride) {
MoveResult result = new MoveResult(req,
new ReplacementMap(),
req.getMoveGesture().getConnections(),
0);
req.getMoveGesture().notifyResult(req, result);
}
}
}
}
}