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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.plugins;
import org.apache.lucene.store.Directory;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.core.Nullable;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.index.engine.Engine;
import org.elasticsearch.index.engine.EngineException;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.index.shard.ShardPath;
import org.elasticsearch.indices.recovery.RecoveryState;
import java.io.IOException;
import java.nio.file.Path;
import java.util.Collections;
import java.util.List;
import java.util.Map;
/**
* A plugin that provides alternative directory implementations.
*/
public interface IndexStorePlugin {
/**
* An interface that describes how to create a new directory instance per shard.
*/
@FunctionalInterface
interface DirectoryFactory {
/**
* Creates a new directory per shard. This method is called once per shard on shard creation.
* @param indexSettings the shards index settings
* @param shardPath the path the shard is using
* @return a new lucene directory instance
* @throws IOException if an IOException occurs while opening the directory
*/
Directory newDirectory(IndexSettings indexSettings, ShardPath shardPath) throws IOException;
}
/**
* The {@link DirectoryFactory} mappings for this plugin. When an index is created the store type setting
* {@link org.elasticsearch.index.IndexModule#INDEX_STORE_TYPE_SETTING} on the index will be examined and either use the default or a
* built-in type, or looked up among all the directory factories from {@link IndexStorePlugin} plugins.
*
* @return a map from store type to an directory factory
*/
Map getDirectoryFactories();
/**
* An interface that allows to create a new {@link RecoveryState} per shard.
*/
@FunctionalInterface
interface RecoveryStateFactory {
/**
* Creates a new {@link RecoveryState} per shard. This method is called once per shard on shard creation.
* @return a new RecoveryState instance
*/
RecoveryState newRecoveryState(ShardRouting shardRouting, DiscoveryNode targetNode, @Nullable DiscoveryNode sourceNode);
}
/**
* The {@link RecoveryStateFactory} mappings for this plugin. When an index is created the recovery type setting
* {@link org.elasticsearch.index.IndexModule#INDEX_RECOVERY_TYPE_SETTING} on the index will be examined and either use the default
* or looked up among all the recovery state factories from {@link IndexStorePlugin} plugins.
*
* @return a map from recovery type to an recovery state factory
*/
default Map getRecoveryStateFactories() {
return Collections.emptyMap();
}
/**
* {@link IndexFoldersDeletionListener} are invoked before the folders of a shard or an index are deleted from disk.
*/
interface IndexFoldersDeletionListener {
/**
* Invoked before the folders of an index are deleted from disk. The list of folders contains {@link Path}s that may or may not
* exist on disk. Shard locks are expected to be acquired at the time this method is invoked.
*
* @param index the {@link Index} of the index whose folders are going to be deleted
* @param indexSettings settings for the index whose folders are going to be deleted
* @param indexPaths the paths of the folders that are going to be deleted
*/
void beforeIndexFoldersDeleted(Index index, IndexSettings indexSettings, Path[] indexPaths);
/**
* Invoked before the folders of a shard are deleted from disk. The list of folders contains {@link Path}s that may or may not
* exist on disk. Shard locks are expected to be acquired at the time this method is invoked.
*
* @param shardId the {@link ShardId} of the shard whose folders are going to be deleted
* @param indexSettings index settings of the shard whose folders are going to be deleted
* @param shardPaths the paths of the folders that are going to be deleted
*/
void beforeShardFoldersDeleted(ShardId shardId, IndexSettings indexSettings, Path[] shardPaths);
}
/**
* The {@link IndexFoldersDeletionListener} listeners for this plugin. When the folders of an index or a shard are deleted from disk,
* these listeners are invoked before the deletion happens in order to allow plugin to clean up any resources if needed.
*
* @return a list of {@link IndexFoldersDeletionListener} listeners
*/
default List getIndexFoldersDeletionListeners() {
return Collections.emptyList();
}
/**
* An interface that allows plugins to override the {@link org.apache.lucene.index.IndexCommit} of which a snapshot is taken. By default
* we snapshot the latest such commit.
*/
@FunctionalInterface
interface SnapshotCommitSupplier {
Engine.IndexCommitRef acquireIndexCommitForSnapshot(Engine engine) throws EngineException;
}
/**
* The {@link SnapshotCommitSupplier} mappings for this plugin. When an index is created the store type setting
* {@link org.elasticsearch.index.IndexModule#INDEX_STORE_TYPE_SETTING} on the index will determine whether the snapshot commit supplier
* should be overridden and, if so, which override to use.
*
* @return a collection of snapshot commit suppliers, keyed by the value of
* {@link org.elasticsearch.index.IndexModule#INDEX_STORE_TYPE_SETTING}.
*/
default Map getSnapshotCommitSuppliers() {
return Collections.emptyMap();
}
}