com.netflix.hystrix.HystrixCommandKey Maven / Gradle / Ivy
/**
* 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 com.netflix.hystrix.util.InternMap;
/**
* A key to represent a {@link HystrixCommand} 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 HystrixCommandKey extends HystrixKey {
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 final InternMap intern
= new InternMap(
new InternMap.ValueConstructor() {
@Override
public HystrixCommandKeyDefault create(String key) {
return new HystrixCommandKeyDefault(key);
}
});
/**
* Retrieve (or create) an interned HystrixCommandKey instance for a given name.
*
* @param name command name
* @return HystrixCommandKey instance that is interned (cached) so a given name will always retrieve the same instance.
*/
public static HystrixCommandKey asKey(String name) {
return intern.interned(name);
}
private static class HystrixCommandKeyDefault extends HystrixKey.HystrixKeyDefault implements HystrixCommandKey {
public HystrixCommandKeyDefault(String name) {
super(name);
}
}
/* package-private */ static int getCommandCount() {
return intern.size();
}
}
}