sigram commented on a change in pull request #1626: URL: https://github.com/apache/lucene-solr/pull/1626#discussion_r446935828
########## File path: solr/core/src/java/org/apache/solr/util/circuitbreaker/CircuitBreakerManager.java ########## @@ -0,0 +1,128 @@ +/* + * 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.solr.util.circuitbreaker; + +import java.util.HashMap; +import java.util.Map; + +import org.apache.solr.core.SolrCore; + +/** + * Manages all registered circuit breaker instances. Responsible for a holistic view + * of whether a circuit breaker has tripped or not. + * + * There are two typical ways of using this class's instance: + * 1. Check if any circuit breaker has triggered -- and know which circuit breaker has triggered. + * 2. Get an instance of a specific circuit breaker and perform checks. + * + * It is a good practice to register new circuit breakers here if you want them checked for every + * request. + * + * NOTE: The current way of registering new default circuit breakers is minimal and not a long term + * solution. There will be a follow up with a SIP for a schema API design. + */ +public class CircuitBreakerManager { + + private final Map<CircuitBreakerType, CircuitBreaker> circuitBreakerMap = new HashMap<>(); + + // Allows replacing of existing circuit breaker + public void registerCircuitBreaker(CircuitBreakerType circuitBreakerType, CircuitBreaker circuitBreaker) { + circuitBreakerMap.put(circuitBreakerType, circuitBreaker); + } + + public CircuitBreaker getCircuitBreaker(CircuitBreakerType circuitBreakerType) { + assert circuitBreakerType != null; + + return circuitBreakerMap.get(circuitBreakerType); + } + + /** + * Check if any circuit breaker has triggered. + * @return CircuitBreakers which have triggered, null otherwise + */ + public Map<CircuitBreakerType, CircuitBreaker> checkAllCircuitBreakersAndReturnTrippedBreakers() { + Map<CircuitBreakerType, CircuitBreaker> triggeredCircuitBreakers = null; Review comment: If this is called on every query request then it makes sense to avoid allocations until they are needed. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org
