com.netflix.hystrix.HystrixCollapserKey Maven / Gradle / Ivy
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/**
* Copyright 2012 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.hystrix;
import java.util.concurrent.ConcurrentHashMap;
/**
* A key to represent a {@link HystrixCollapser} for monitoring, circuit-breakers, metrics publishing, caching and other such uses.
*
* This interface is intended to work natively with Enums so that implementing code can be an enum that implements this interface.
*/
public interface HystrixCollapserKey {
/**
* The word 'name' is used instead of 'key' so that Enums can implement this interface and it work natively.
*
* @return String
*/
public String name();
public static class Factory {
private Factory() {
}
// used to intern instances so we don't keep re-creating them millions of times for the same key
private static ConcurrentHashMap intern = new ConcurrentHashMap();
/**
* Retrieve (or create) an interned HystrixCollapserKey instance for a given name.
*
* @param name collapser name
* @return HystrixCollapserKey instance that is interned (cached) so a given name will always retrieve the same instance.
*/
public static HystrixCollapserKey asKey(String name) {
HystrixCollapserKey k = intern.get(name);
if (k == null) {
intern.putIfAbsent(name, new HystrixCollapserKeyDefault(name));
}
return intern.get(name);
}
private static class HystrixCollapserKeyDefault implements HystrixCollapserKey {
private String name;
private HystrixCollapserKeyDefault(String name) {
this.name = name;
}
@Override
public String name() {
return name;
}
@Override
public String toString() {
return name;
}
}
}
}