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https://issues.apache.org/jira/browse/STORM-1257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15117449#comment-15117449
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ASF GitHub Bot commented on STORM-1257:
---------------------------------------
Github user revans2 commented on a diff in the pull request:
https://github.com/apache/storm/pull/1047#discussion_r50854133
--- Diff:
storm-core/src/jvm/org/apache/storm/zookeeper/LeaderElectorImp.java ---
@@ -0,0 +1,135 @@
+/**
+ * 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.storm.zookeeper;
+
+import org.apache.curator.framework.CuratorFramework;
+import org.apache.curator.framework.recipes.leader.LeaderLatch;
+import org.apache.curator.framework.recipes.leader.LeaderLatchListener;
+import org.apache.curator.framework.recipes.leader.Participant;
+import org.apache.storm.nimbus.ILeaderElector;
+import org.apache.storm.nimbus.NimbusInfo;
+import org.apache.storm.utils.Utils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicReference;
+
+
+public class LeaderElectorImp implements ILeaderElector {
+ private static Logger LOG =
LoggerFactory.getLogger(LeaderElectorImp.class);
+ private Map conf;
+ private List<String> servers;
+ private CuratorFramework zk;
+ private String leaderlockPath;
+ private String id;
+ private AtomicReference<LeaderLatch> leaderLatch;
+ private AtomicReference<LeaderLatchListener> leaderLatchListener;
+
+ public LeaderElectorImp(Map conf, List<String> servers,
CuratorFramework zk, String leaderlockPath, String id,
AtomicReference<LeaderLatch> leaderLatch,
+ AtomicReference<LeaderLatchListener>
leaderLatchListener) {
+ this.conf = conf;
+ this.servers = servers;
+ this.zk = zk;
+ this.leaderLatch = leaderLatch;
+ this.id = id;
+ this.leaderLatch = leaderLatch;
+ this.leaderLatchListener = leaderLatchListener;
+ }
+
+ @Override
+ public void prepare(Map conf) {
+ LOG.info("no-op for zookeeper implementation");
+ }
+
+ @Override
+ public void addToLeaderLockQueue() {
+ // if this latch is already closed, we need to create new instance.
+ try {
+ if
(LeaderLatch.State.CLOSED.equals(leaderLatch.get().getState())) {
+ leaderLatch.set(new LeaderLatch(zk, leaderlockPath));
+
leaderLatchListener.set(Zookeeper.leaderLatchListenerImpl(conf, zk,
leaderLatch.get()));
+ }
+ // Only if the latch is not already started we invoke start
+ if
(LeaderLatch.State.LATENT.equals(leaderLatch.get().getState())) {
+ leaderLatch.get().addListener(leaderLatchListener.get());
+ leaderLatch.get().start();
+ LOG.info("Queued up for leader lock.");
+ } else {
+ LOG.info("Node already in queue for leader lock.");
+ }
+ } catch (Exception e) {
+ LOG.warn("failed to add LeaderLatchListener", e);
+ }
+
+ }
+
+ @Override
+ // Only started latches can be closed.
+ public void removeFromLeaderLockQueue() {
+ if
(LeaderLatch.State.STARTED.equals(leaderLatch.get().getState())) {
+ try {
+ leaderLatch.get().close();
+ LOG.info("Removed from leader lock queue.");
+ } catch (IOException e) {
+ LOG.warn("failed to close leaderLatch!!");
+ }
+
+ } else {
+ LOG.info("leader latch is not started so no
removeFromLeaderLockQueue needed.");
+ }
+ }
+
+ @Override
+ public boolean isLeader() throws Exception {
+ return leaderLatch.get().hasLeadership();
+ }
+
+ @Override
+ public NimbusInfo getLeader() {
+ try {
+ return Zookeeper.toNimbusInfo(leaderLatch.get().getLeader());
+ } catch (Exception e) {
+ throw Utils.wrapInRuntime(e);
+ }
+ }
+
+ @Override
+ public List<NimbusInfo> getAllNimbuses() {
+ List<NimbusInfo> nimbusInfos = new ArrayList<>();
+ try {
+ Collection<Participant> participants =
leaderLatch.get().getParticipants();
+ for (Participant participant : participants) {
+ nimbusInfos.add(Zookeeper.toNimbusInfo(participant));
+ }
+ } catch (Exception e) {
+ LOG.warn("failed to get nimbuses", e);
+ }
--- End diff --
Again don't eat the exception throw it, and wrap it if you cannot update
the interface.
> port backtype.storm.zookeeper to java
> -------------------------------------
>
> Key: STORM-1257
> URL: https://issues.apache.org/jira/browse/STORM-1257
> Project: Apache Storm
> Issue Type: New Feature
> Components: storm-core
> Reporter: Robert Joseph Evans
> Assignee: John Fang
> Labels: java-migration, jstorm-merger
>
> A wrapper around zookeeper/curator.
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