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Utility classes and methods developed for Brooklyn but not dependendent on Brooklyn or much else
/*
* 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 org.apache.brooklyn.util.guava;
import java.util.concurrent.atomic.AtomicInteger;
import com.google.common.base.Supplier;
public class Suppliers {
private Suppliers() {}
/**
* @return A supplier that atomically increments the value returned on each call to
* {@link Supplier#get get}, starting from zero.
*/
public static Supplier incrementing() {
return incrementing(0);
}
/**
* @return A supplier that atomically increments the value returned on each call to
* {@link Supplier#get get}, starting from initialValue
.
*/
public static Supplier incrementing(int initialValue) {
return new IncrementingSupplier(initialValue);
}
private static class IncrementingSupplier implements Supplier {
private final AtomicInteger value;
private IncrementingSupplier(int initialValue) {
this.value = new AtomicInteger(initialValue);
}
@Override
public Integer get() {
return value.getAndIncrement();
}
}
}