com.metamx.common.guava.LimitedYieldingAccumulator Maven / Gradle / Ivy
/*
* Copyright 2011 - 2015 Metamarkets Group Inc.
*
* 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 com.metamx.common.guava;
/**
* @deprecated this class uses expensive volatile counter inside, but it is not thread-safe. It is going to be removed
* in the future.
*/
@Deprecated
public class LimitedYieldingAccumulator extends YieldingAccumulator
{
private final int limit;
private final YieldingAccumulator delegate;
private volatile int count = 0;
public LimitedYieldingAccumulator(
YieldingAccumulator delegate, int limit
)
{
this.limit = limit;
this.delegate = delegate;
}
@Override
public void yield()
{
delegate.yield();
}
@Override
public boolean yielded()
{
return delegate.yielded();
}
@Override
public void reset()
{
delegate.reset();
}
@Override
public OutType accumulate(OutType accumulated, T in)
{
if (count < limit) {
count++;
return delegate.accumulate(accumulated, in);
}
return accumulated;
}
}