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/*
* 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.cluster.routing;
/**
* Records changes made to {@link RoutingNodes} during an allocation round.
*/
public interface RoutingChangesObserver {
/**
* Called when unassigned shard is initialized. Does not include initializing relocation target shards.
*/
void shardInitialized(ShardRouting unassignedShard, ShardRouting initializedShard);
/**
* Called when an initializing shard is started.
*/
void shardStarted(ShardRouting initializingShard, ShardRouting startedShard);
/**
* Called when relocation of a started shard is initiated.
*/
void relocationStarted(ShardRouting startedShard, ShardRouting targetRelocatingShard);
/**
* Called when an unassigned shard's unassigned information was updated
*/
void unassignedInfoUpdated(ShardRouting unassignedShard, UnassignedInfo newUnassignedInfo);
/**
* Called when a shard is failed or cancelled.
*/
void shardFailed(ShardRouting failedShard, UnassignedInfo unassignedInfo);
/**
* Called on relocation source when relocation completes after relocation target is started.
*/
void relocationCompleted(ShardRouting removedRelocationSource);
/**
* Called on replica relocation target when replica relocation source fails. Promotes the replica relocation target to ordinary
* initializing shard.
*/
void relocationSourceRemoved(ShardRouting removedReplicaRelocationSource);
/**
* Called when started replica is promoted to primary.
*/
void replicaPromoted(ShardRouting replicaShard);
/**
* Called when an initializing replica is reinitialized. This happens when a primary relocation completes, which
* reinitializes all currently initializing replicas as their recovery source node changes
*/
void initializedReplicaReinitialized(ShardRouting oldReplica, ShardRouting reinitializedReplica);
/**
* Abstract implementation of {@link RoutingChangesObserver} that does not take any action. Useful for subclasses that only override
* certain methods.
*/
class AbstractRoutingChangesObserver implements RoutingChangesObserver {
@Override
public void shardInitialized(ShardRouting unassignedShard, ShardRouting initializedShard) {
}
@Override
public void shardStarted(ShardRouting initializingShard, ShardRouting startedShard) {
}
@Override
public void relocationStarted(ShardRouting startedShard, ShardRouting targetRelocatingShard) {
}
@Override
public void unassignedInfoUpdated(ShardRouting unassignedShard, UnassignedInfo newUnassignedInfo) {
}
@Override
public void shardFailed(ShardRouting activeShard, UnassignedInfo unassignedInfo) {
}
@Override
public void relocationCompleted(ShardRouting removedRelocationSource) {
}
@Override
public void relocationSourceRemoved(ShardRouting removedReplicaRelocationSource) {
}
@Override
public void replicaPromoted(ShardRouting replicaShard) {
}
@Override
public void initializedReplicaReinitialized(ShardRouting oldReplica, ShardRouting reinitializedReplica) {
}
}
class DelegatingRoutingChangesObserver implements RoutingChangesObserver {
private final RoutingChangesObserver[] routingChangesObservers;
public DelegatingRoutingChangesObserver(RoutingChangesObserver... routingChangesObservers) {
this.routingChangesObservers = routingChangesObservers;
}
@Override
public void shardInitialized(ShardRouting unassignedShard, ShardRouting initializedShard) {
for (RoutingChangesObserver routingChangesObserver : routingChangesObservers) {
routingChangesObserver.shardInitialized(unassignedShard, initializedShard);
}
}
@Override
public void shardStarted(ShardRouting initializingShard, ShardRouting startedShard) {
for (RoutingChangesObserver routingChangesObserver : routingChangesObservers) {
routingChangesObserver.shardStarted(initializingShard, startedShard);
}
}
@Override
public void relocationStarted(ShardRouting startedShard, ShardRouting targetRelocatingShard) {
for (RoutingChangesObserver routingChangesObserver : routingChangesObservers) {
routingChangesObserver.relocationStarted(startedShard, targetRelocatingShard);
}
}
@Override
public void unassignedInfoUpdated(ShardRouting unassignedShard, UnassignedInfo newUnassignedInfo) {
for (RoutingChangesObserver routingChangesObserver : routingChangesObservers) {
routingChangesObserver.unassignedInfoUpdated(unassignedShard, newUnassignedInfo);
}
}
@Override
public void shardFailed(ShardRouting activeShard, UnassignedInfo unassignedInfo) {
for (RoutingChangesObserver routingChangesObserver : routingChangesObservers) {
routingChangesObserver.shardFailed(activeShard, unassignedInfo);
}
}
@Override
public void relocationCompleted(ShardRouting removedRelocationSource) {
for (RoutingChangesObserver routingChangesObserver : routingChangesObservers) {
routingChangesObserver.relocationCompleted(removedRelocationSource);
}
}
@Override
public void relocationSourceRemoved(ShardRouting removedReplicaRelocationSource) {
for (RoutingChangesObserver routingChangesObserver : routingChangesObservers) {
routingChangesObserver.relocationSourceRemoved(removedReplicaRelocationSource);
}
}
@Override
public void replicaPromoted(ShardRouting replicaShard) {
for (RoutingChangesObserver routingChangesObserver : routingChangesObservers) {
routingChangesObserver.replicaPromoted(replicaShard);
}
}
@Override
public void initializedReplicaReinitialized(ShardRouting oldReplica, ShardRouting reinitializedReplica) {
for (RoutingChangesObserver routingChangesObserver : routingChangesObservers) {
routingChangesObserver.initializedReplicaReinitialized(oldReplica, reinitializedReplica);
}
}
}
}
