| /* |
| * 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.cloud; |
| |
| import java.lang.invoke.MethodHandles; |
| |
| import java.util.concurrent.TimeUnit; |
| |
| import org.apache.solr.common.util.TimeSource; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| // this class may be accessed by multiple threads, but only one at a time |
| public class ActionThrottle { |
| private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); |
| |
| private volatile Long lastActionStartedAt; |
| private volatile Long minMsBetweenActions; |
| |
| private final String name; |
| private final TimeSource timeSource; |
| |
| public ActionThrottle(String name, long minMsBetweenActions) { |
| this(name, minMsBetweenActions, TimeSource.NANO_TIME); |
| } |
| |
| public ActionThrottle(String name, long minMsBetweenActions, TimeSource timeSource) { |
| this.name = name; |
| this.minMsBetweenActions = minMsBetweenActions; |
| this.timeSource = timeSource; |
| } |
| |
| public ActionThrottle(String name, long minMsBetweenActions, long lastActionStartedAt) { |
| this(name, minMsBetweenActions, lastActionStartedAt, TimeSource.NANO_TIME); |
| } |
| |
| public ActionThrottle(String name, long minMsBetweenActions, long lastActionStartedAt, TimeSource timeSource) { |
| this.name = name; |
| this.minMsBetweenActions = minMsBetweenActions; |
| this.lastActionStartedAt = lastActionStartedAt; |
| this.timeSource = timeSource; |
| } |
| |
| public void reset() { |
| lastActionStartedAt = null; |
| } |
| |
| public void markAttemptingAction() { |
| lastActionStartedAt = timeSource.getTimeNs(); |
| } |
| |
| public void minimumWaitBetweenActions() { |
| if (lastActionStartedAt == null) { |
| return; |
| } |
| long diff = timeSource.getTimeNs() - lastActionStartedAt; |
| int diffMs = (int) TimeUnit.MILLISECONDS.convert(diff, TimeUnit.NANOSECONDS); |
| long minNsBetweenActions = TimeUnit.NANOSECONDS.convert(minMsBetweenActions, TimeUnit.MILLISECONDS); |
| log.debug("The last {} attempt started {}ms ago.", name, diffMs); |
| int sleep = 0; |
| |
| if (diffMs > 0 && diff < minNsBetweenActions) { |
| sleep = (int) TimeUnit.MILLISECONDS.convert(minNsBetweenActions - diff, TimeUnit.NANOSECONDS); |
| } else if (diffMs == 0) { |
| sleep = minMsBetweenActions.intValue(); |
| } |
| |
| if (sleep > 0) { |
| log.info("Throttling {} attempts - waiting for {}ms", name, sleep); |
| try { |
| timeSource.sleep(sleep); |
| } catch (InterruptedException e) { |
| Thread.currentThread().interrupt(); |
| } |
| } |
| } |
| |
| public Long getLastActionStartedAt() { |
| return lastActionStartedAt; |
| } |
| } |