package org.apache.cassandra.utils;
/*
*
* 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.
*
*/
import java.util.concurrent.locks.Condition;
import java.util.concurrent.TimeUnit;
import java.util.Date;
// fulfils the Condition interface without spurious wakeup problems
// (or lost notify problems either: that is, even if you call await()
// _after_ signal(), it will work as desired.)
public class SimpleCondition implements Condition
{
boolean set;
public synchronized void await() throws InterruptedException
{
while (!set)
wait();
}
public synchronized void reset()
{
set = false;
}
public synchronized boolean await(long time, TimeUnit unit) throws InterruptedException
{
// micro/nanoseconds not supported
assert unit == TimeUnit.DAYS || unit == TimeUnit.HOURS || unit == TimeUnit.MINUTES || unit == TimeUnit.SECONDS || unit == TimeUnit.MILLISECONDS;
long end = System.currentTimeMillis() + unit.convert(time, TimeUnit.MILLISECONDS);
while (!set && end > System.currentTimeMillis())
{
TimeUnit.MILLISECONDS.timedWait(this, end - System.currentTimeMillis());
}
return set;
}
public synchronized void signal()
{
set = true;
notify();
}
public synchronized void signalAll()
{
set = true;
notifyAll();
}
public synchronized boolean isSignaled()
{
return set;
}
public void awaitUninterruptibly()
{
throw new UnsupportedOperationException();
}
public long awaitNanos(long nanosTimeout) throws InterruptedException
{
throw new UnsupportedOperationException();
}
public boolean awaitUntil(Date deadline) throws InterruptedException
{
throw new UnsupportedOperationException();
}
}