/**
* 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.
*/
package com.twitter.distributedlog.service.balancer;
public class LimitedStreamChooser implements StreamChooser {
public static LimitedStreamChooser of(StreamChooser underlying, int limit) {
return new LimitedStreamChooser(underlying, limit);
}
final StreamChooser underlying;
int limit;
LimitedStreamChooser(StreamChooser underlying, int limit) {
this.underlying = underlying;
this.limit = limit;
}
@Override
public synchronized String choose() {
if (limit <= 0) {
return null;
}
String s = underlying.choose();
if (s == null) {
limit = 0;
return null;
}
--limit;
return s;
}
}