com.netflix.config.CachedDynamicLongProperty Maven / Gradle / Ivy
/**
* Copyright 2014 Netflix, 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.netflix.config;
/**
* An implementation of {@link DynamicLongProperty} that caches the primitive value whenever it is changed.
*
* This can give improved performance due to avoiding the unboxing, at the expense of additional
* memory usage.
*
* @author Mike Smith
*
*/
public class CachedDynamicLongProperty extends DynamicLongProperty {
protected volatile long primitiveValue;
public CachedDynamicLongProperty(String propName, long defaultValue) {
super(propName, Long.valueOf(defaultValue));
// Set the initial value of the cached primitive value.
this.primitiveValue = chooseValue();
}
@Override
protected void propertyChanged() {
// Update the cached primitive value when the property is changed.
this.primitiveValue = chooseValue();
}
/**
* Get the current value from the underlying DynamicProperty
*
* @return
*/
protected long chooseValue() {
return prop.getLong(defaultValue).longValue();
}
/**
* Get the current cached value.
*
* @return
*/
@Override
public long get() {
return primitiveValue;
}
@Override
public Long getValue() {
return get();
}
}