org.elasticsearch.discovery.BlockingClusterStatePublishResponseHandler Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch Show documentation
Show all versions of elasticsearch Show documentation
Elasticsearch subproject :distribution:archives:integ-test-zip
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.discovery;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.util.concurrent.ConcurrentCollections;
import org.elasticsearch.core.TimeValue;
import java.util.Collections;
import java.util.Set;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
/**
* Handles responses obtained when publishing a new cluster state from master to all non master nodes.
* Allows to await a reply from all non master nodes, up to a timeout
*/
public class BlockingClusterStatePublishResponseHandler {
private final CountDownLatch latch;
private final Set pendingNodes;
private final Set failedNodes;
/**
* Creates a new BlockingClusterStatePublishResponseHandler
* @param publishingToNodes the set of nodes to which the cluster state will be published and should respond
*/
public BlockingClusterStatePublishResponseHandler(Set publishingToNodes) {
this.pendingNodes = ConcurrentCollections.newConcurrentSet();
this.pendingNodes.addAll(publishingToNodes);
this.latch = new CountDownLatch(pendingNodes.size());
this.failedNodes = ConcurrentCollections.newConcurrentSet();
}
/**
* Called for each response obtained from non master nodes
*
* @param node the node that replied to the publish event
*/
public void onResponse(DiscoveryNode node) {
boolean found = pendingNodes.remove(node);
assert found : "node [" + node + "] already responded or failed";
latch.countDown();
}
/**
* Called for each failure obtained from non master nodes
* @param node the node that replied to the publish event
*/
public void onFailure(DiscoveryNode node, Exception e) {
boolean found = pendingNodes.remove(node);
assert found : "node [" + node + "] already responded or failed";
boolean added = failedNodes.add(node);
assert added : "duplicate failures for " + node;
latch.countDown();
}
/**
* Allows to wait for all non master nodes to reply to the publish event up to a timeout
* @param timeout the timeout
* @return true if the timeout expired or not, false otherwise
*/
public boolean awaitAllNodes(TimeValue timeout) throws InterruptedException {
boolean success = latch.await(timeout.millis(), TimeUnit.MILLISECONDS);
assert success == false || pendingNodes.isEmpty() : "response count reached 0 but still waiting for some nodes";
return success;
}
/**
* returns a list of nodes which didn't respond yet
*/
public DiscoveryNode[] pendingNodes() {
// we use a zero length array, because if we try to pre allocate we may need to remove trailing
// nulls if some nodes responded in the meanwhile
return pendingNodes.toArray(new DiscoveryNode[0]);
}
/**
* returns a set of nodes for which publication has failed.
*/
public Set getFailedNodes() {
return Collections.unmodifiableSet(failedNodes);
}
}