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https://issues.apache.org/jira/browse/GOSSIP-75?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16088608#comment-16088608
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ASF GitHub Bot commented on GOSSIP-75:
--------------------------------------
Github user edwardcapriolo commented on a diff in the pull request:
https://github.com/apache/incubator-gossip/pull/62#discussion_r127584678
--- Diff: gossip-base/src/main/java/org/apache/gossip/lock/LockManager.java
---
@@ -0,0 +1,152 @@
+package org.apache.gossip.lock;
+
+import org.apache.gossip.Member;
+import org.apache.gossip.event.data.UpdateSharedDataEventHandler;
+import org.apache.gossip.lock.vote.Vote;
+import org.apache.gossip.lock.vote.VoteContext;
+import org.apache.gossip.manager.GossipManager;
+import org.apache.gossip.model.SharedDataMessage;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.Timer;
+import java.util.TimerTask;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
+
+public class LockManager {
+
+ private final GossipManager gossipManager;
+ private final Map<String, VoteContext> voteContextMap;
+ private final ScheduledExecutorService scheduledExecutorService;
+
+ public LockManager(GossipManager gossipManager) {
+ this.gossipManager = gossipManager;
+ this.voteContextMap = new ConcurrentHashMap<>();
+ this.gossipManager.registerSharedDataSubscriber((key, oldValue,
newValue) -> {
+ if(newValue != null && newValue instanceof VoteContext){
+ VoteContext voteContext = (VoteContext) newValue;
+ voteContextMap.put(voteContext.getVoteId(),voteContext);
+ if(gossipManager.getMyself().getId().equals("4")) {
+ System.out.println(voteContext);
+ }
+ }
+ });
+ scheduledExecutorService = Executors.newScheduledThreadPool(2);
+ scheduledExecutorService.scheduleAtFixedRate(this::update, 0,
+ 1000, TimeUnit.MILLISECONDS);
+ scheduledExecutorService.scheduleAtFixedRate(this::test, 0,
+ 1000, TimeUnit.MILLISECONDS);
+ }
+
+ public void acquireSharedDataLock(String key) {
+ String id = UUID.randomUUID().toString();
+
+ VoteContext voteContext = new VoteContext(id,
gossipManager.getMyself().getId(), key, new ArrayList<>());
+ voteContext.addVote(new Vote(gossipManager.getMyself().getId(), true,
+
gossipManager.getLiveMembers().stream().map(Member::getId).collect(Collectors.toList()),
+ gossipManager.getDeadMembers().stream().map(Member::getId)
+ .collect(Collectors.toList())));
+ SharedDataMessage d = new SharedDataMessage();
+ d.setKey(voteContext.getVoteId());
+ d.setPayload(voteContext);
+ d.setExpireAt(Long.MAX_VALUE);
+ d.setTimestamp(System.currentTimeMillis());
+ gossipManager.gossipSharedData(d);
+
+ while (true){
--- End diff --
Add counters here so we see how much loop contention we have
> Voting interface
> ----------------
>
> Key: GOSSIP-75
> URL: https://issues.apache.org/jira/browse/GOSSIP-75
> Project: Gossip
> Issue Type: New Feature
> Reporter: Edward Capriolo
>
> Gossip has CRDT support. This is an important building block to doing higher
> level things. The next piece is being able to act on an object when we
> receive it. For example lets take the most simple case. I want the cluster to
> vote on something such as "who asked for this lock first". Currently we
> replicate objects lazily through a thread, what we want to do is on reception
> of an object apply some function such that we can modify the object being
> received.
> The way I want to go about this is voting objects can be injected with a type
> like VoteContext
> http://stackoverflow.com/questions/27133161/how-to-pass-constructors-parameters-with-jackson
>
> Users can register Voter implementations. On receiving an object the
> interface allows logic to be run. In the case of a Voting each node appends
> its vote as the object moves around over time you can poll your local copy
> and determine the result of the vote.
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