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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchlib.expression;
import com.yahoo.vespa.objects.Deserializer;
import com.yahoo.vespa.objects.ObjectVisitor;
import com.yahoo.vespa.objects.Serializer;
/**
* This is a debug wait function node that waits for a specified amount of time before executing its expression.
*
* @author Ulf Lilleengen
*/
public class DebugWaitFunctionNode extends UnaryFunctionNode {
public static final int classId = registerClass(0x4000 + 144, DebugWaitFunctionNode.class, DebugWaitFunctionNode::new);
private double waitTime;
private boolean busyWait;
public DebugWaitFunctionNode() { }
/**
* Constructs an instance of this class with given argument and wait parameters.
*
* @param arg The argument for this function.
* @param waitTime The time to wait before executing expression.
* @param busyWait true if busy wait, false if not.
*/
public DebugWaitFunctionNode(ExpressionNode arg, double waitTime, boolean busyWait) {
addArg(arg);
this.waitTime = waitTime;
this.busyWait = busyWait;
}
@Override
public void onPrepare() {
super.onPrepare();
}
@Override
public boolean onExecute() {
// TODO: Add wait code.
double millis = waitTime * 1000.0;
long start = System.currentTimeMillis();
try {
while ((System.currentTimeMillis() - start) < millis) {
if (busyWait) {
for (int i = 0; i < 1000; i++) {
;
}
} else {
long rem = (long)(millis - (System.currentTimeMillis() - start));
Thread.sleep(rem);
}
}
} catch (InterruptedException ie) {
// Not critical
}
getArg().execute();
getResult().set(getArg().getResult());
return true;
}
@Override
public int hashCode() {
return super.hashCode() + (int)waitTime + (busyWait ? 1 : 0);
}
@Override
protected boolean equalsUnaryFunction(UnaryFunctionNode obj) {
DebugWaitFunctionNode rhs = (DebugWaitFunctionNode)obj;
return waitTime == rhs.waitTime && busyWait == rhs.busyWait;
}
@Override
protected void onSerialize(Serializer buf) {
super.onSerialize(buf);
buf.putDouble(null, waitTime);
byte tmp = busyWait ? (byte)1 : (byte)0;
buf.putByte(null, tmp);
}
@Override
protected void onDeserialize(Deserializer buf) {
super.onDeserialize(buf);
waitTime = buf.getDouble(null);
byte tmp = buf.getByte(null);
busyWait = (tmp != 0);
}
@Override
public void visitMembers(ObjectVisitor visitor) {
super.visitMembers(visitor);
visitor.visit("waitTime", waitTime);
visitor.visit("busyWait", busyWait);
}
@Override
protected int onGetClassId() {
return classId;
}
}
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