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/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.routing;
/**
* Similar to {@link ImmutableShardRouting} this class keeps metadata of the current shard. But unlike
* {@link ImmutableShardRouting} the information kept in this class can be modified.
* These modifications include changing the primary state, relocating and assigning the shard
* represented by this class
*/
public class MutableShardRouting extends ImmutableShardRouting {
public MutableShardRouting(ShardRouting copy) {
super(copy);
}
public MutableShardRouting(ShardRouting copy, long version) {
super(copy);
this.version = version;
}
public MutableShardRouting(String index, int shardId, String currentNodeId, boolean primary, ShardRoutingState state, long version) {
super(index, shardId, currentNodeId, primary, state, version);
}
public MutableShardRouting(String index, int shardId, String currentNodeId,
String relocatingNodeId, boolean primary, ShardRoutingState state, long version) {
super(index, shardId, currentNodeId, relocatingNodeId, primary, state, version);
}
/**
* Assign this shard to a node.
*
* @param nodeId id of the node to assign this shard to
*/
public void assignToNode(String nodeId) {
version++;
if (currentNodeId == null) {
assert state == ShardRoutingState.UNASSIGNED;
state = ShardRoutingState.INITIALIZING;
currentNodeId = nodeId;
relocatingNodeId = null;
} else if (state == ShardRoutingState.STARTED) {
state = ShardRoutingState.RELOCATING;
relocatingNodeId = nodeId;
} else if (state == ShardRoutingState.RELOCATING) {
assert nodeId.equals(relocatingNodeId);
}
}
/**
* Relocate the shard to another node.
*
* @param relocatingNodeId id of the node to relocate the shard
*/
public void relocate(String relocatingNodeId) {
version++;
assert state == ShardRoutingState.STARTED;
state = ShardRoutingState.RELOCATING;
this.relocatingNodeId = relocatingNodeId;
}
/**
* Cancel relocation of a shard. The shards state must be set
* to RELOCATING.
*/
public void cancelRelocation() {
version++;
assert state == ShardRoutingState.RELOCATING;
assert assignedToNode();
assert relocatingNodeId != null;
state = ShardRoutingState.STARTED;
relocatingNodeId = null;
}
/**
* Set the shards state to UNASSIGNED.
* //TODO document the state
*/
public void deassignNode() {
version++;
assert state != ShardRoutingState.UNASSIGNED;
state = ShardRoutingState.UNASSIGNED;
this.currentNodeId = null;
this.relocatingNodeId = null;
}
/**
* Set the shards state to STARTED. The shards state must be
* INITIALIZING or RELOCATING. Any relocation will be
* canceled.
*/
public void moveToStarted() {
version++;
assert state == ShardRoutingState.INITIALIZING || state == ShardRoutingState.RELOCATING;
relocatingNodeId = null;
state = ShardRoutingState.STARTED;
}
/**
* Make the shard primary unless it's not Primary
* //TODO: doc exception
*/
public void moveToPrimary() {
version++;
if (primary) {
throw new IllegalShardRoutingStateException(this, "Already primary, can't move to primary");
}
primary = true;
}
/**
* Set the primary shard to non-primary
*/
public void moveFromPrimary() {
version++;
if (!primary) {
throw new IllegalShardRoutingStateException(this, "Not primary, can't move to replica");
}
primary = false;
}
}
