/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.cluster;
import com.carrotsearch.hppc.cursors.ObjectCursor;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.metadata.MetaData;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import java.util.Arrays;
import java.util.List;
/**
*
*/
public class ClusterChangedEvent {
private final String source;
private final ClusterState previousState;
private final ClusterState state;
private final DiscoveryNodes.Delta nodesDelta;
public ClusterChangedEvent(String source, ClusterState state, ClusterState previousState) {
this.source = source;
this.state = state;
this.previousState = previousState;
this.nodesDelta = state.nodes().delta(previousState.nodes());
}
/**
* The source that caused this cluster event to be raised.
*/
public String source() {
return this.source;
}
public ClusterState state() {
return this.state;
}
public ClusterState previousState() {
return this.previousState;
}
public boolean routingTableChanged() {
return state.routingTable() != previousState.routingTable();
}
public boolean indexRoutingTableChanged(String index) {
if (!state.routingTable().hasIndex(index) && !previousState.routingTable().hasIndex(index)) {
return false;
}
if (state.routingTable().hasIndex(index) && previousState.routingTable().hasIndex(index)) {
return state.routingTable().index(index) != previousState.routingTable().index(index);
}
return true;
}
/**
* Returns the indices created in this event
*/
public List<String> indicesCreated() {
if (previousState == null) {
return Arrays.asList(state.metaData().indices().keys().toArray(String.class));
}
if (!metaDataChanged()) {
return ImmutableList.of();
}
List<String> created = null;
for (ObjectCursor<String> cursor : state.metaData().indices().keys()) {
String index = cursor.value;
if (!previousState.metaData().hasIndex(index)) {
if (created == null) {
created = Lists.newArrayList();
}
created.add(index);
}
}
return created == null ? ImmutableList.<String>of() : created;
}
/**
* Returns the indices deleted in this event
*/
public List<String> indicesDeleted() {
if (previousState == null) {
return ImmutableList.of();
}
if (!metaDataChanged()) {
return ImmutableList.of();
}
List<String> deleted = null;
for (ObjectCursor<String> cursor : previousState.metaData().indices().keys()) {
String index = cursor.value;
if (!state.metaData().hasIndex(index)) {
if (deleted == null) {
deleted = Lists.newArrayList();
}
deleted.add(index);
}
}
return deleted == null ? ImmutableList.<String>of() : deleted;
}
public boolean metaDataChanged() {
return state.metaData() != previousState.metaData();
}
public boolean indexMetaDataChanged(IndexMetaData current) {
MetaData previousMetaData = previousState.metaData();
if (previousMetaData == null) {
return true;
}
IndexMetaData previousIndexMetaData = previousMetaData.index(current.index());
// no need to check on version, since disco modules will make sure to use the
// same instance if its a version match
if (previousIndexMetaData == current) {
return false;
}
return true;
}
public boolean blocksChanged() {
return state.blocks() != previousState.blocks();
}
public boolean localNodeMaster() {
return state.nodes().localNodeMaster();
}
public DiscoveryNodes.Delta nodesDelta() {
return this.nodesDelta;
}
public boolean nodesRemoved() {
return nodesDelta.removed();
}
public boolean nodesAdded() {
return nodesDelta.added();
}
public boolean nodesChanged() {
return nodesRemoved() || nodesAdded();
}
}