WillemJiang commented on a change in pull request #403: [SCB-1130] Dynamically configure the master node base on master_lock … URL: https://github.com/apache/servicecomb-pack/pull/403#discussion_r252105256
########## File path: alpha/alpha-server/src/main/java/org/apache/servicecomb/pack/alpha/server/cluster/master/ClusterLockService.java ########## @@ -0,0 +1,146 @@ +/* + * 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.servicecomb.pack.alpha.server.cluster.master; + +import org.apache.servicecomb.pack.alpha.core.NodeStatus; +import org.apache.servicecomb.pack.alpha.server.cluster.master.provider.LockProvider; +import org.apache.servicecomb.pack.alpha.server.cluster.master.provider.Locker; +import org.apache.servicecomb.pack.alpha.server.cluster.master.provider.jdbc.jpa.MasterLock; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; +import org.springframework.beans.factory.annotation.Autowired; +import org.springframework.beans.factory.annotation.Value; +import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty; +import org.springframework.boot.context.event.ApplicationReadyEvent; +import org.springframework.context.ApplicationListener; +import org.springframework.scheduling.annotation.EnableScheduling; +import org.springframework.scheduling.annotation.Scheduled; +import org.springframework.stereotype.Component; + +import java.lang.invoke.MethodHandles; +import java.util.Calendar; +import java.util.Date; +import java.util.Optional; + +/** + * Cluster master preemption master service + * default based on database master_lock table implementation + * <p> + * Set true to enable default value false + * alpha.cluster.master.enabled=true + * <p> + * Implementation type, default jdbc + * alpha.cluster.master.type=jdbc + * <p> + * Lock timeout, default value 5000 millisecond + * alpha.cluster.master.expire=5000 + */ + +@Component +@ConditionalOnProperty(name = "alpha.cluster.master.enabled", havingValue = "true") +@EnableScheduling +public class ClusterLockService implements ApplicationListener<ApplicationReadyEvent> { + + private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); + private boolean locked = Boolean.FALSE; + private boolean lockExecuted = Boolean.FALSE; + private boolean applicationReady = Boolean.FALSE; + private MasterLock masterLock; + private Optional<Locker> locker; + + @Value("[${alpha.server.host}]:${alpha.server.port}") + private String instanceId; + + @Value("${spring.application.name:servicecomb-alpha-server}") + private String serviceName; + + @Value("${alpha.cluster.master.expire:5000}") + private int expire; + + @Autowired + LockProvider lockProvider; + + @Autowired + NodeStatus nodeStatus; + + public ClusterLockService() { + LOG.info("Initialize cluster mode"); + } + + public boolean isMasterNode() { + return locked; + } + + public boolean isLockExecuted() { + return lockExecuted; + } + + public MasterLock getMasterLock() { + if (this.masterLock == null) { + this.masterLock = new MasterLock(); + this.masterLock.setServiceName(serviceName); + this.masterLock.setInstanceId(instanceId); + } + Calendar cal = Calendar.getInstance(); + cal.setTime(new Date()); + cal.add(Calendar.MILLISECOND, expire); + this.masterLock.setExpireTime(cal.getTime()); + this.masterLock.setLockedTime(new Date()); + return this.masterLock; + } + + public void setMasterLock(MasterLock masterLock) { + this.masterLock = masterLock; + } + + @Scheduled(cron = "0/1 * * * * ?") Review comment: Can you add a comment for this setting? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
