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feat: add index aliasing and ephemeral indexes for dynamic index management
- Add real Redis alias operations to RediSearchIndexer (createAlias, removeAlias, updateAlias) - Integrate with existing SearchOperations interface methods - Support FT.ALIASADD, FT.ALIASUPDATE, FT.ALIASDEL Redis commands - Update IndexMigrationService to use real Redis aliasing for blue-green deployments - switchAlias() now creates actual Redis aliases instead of stub implementation - Enable zero-downtime index migrations with atomic alias switching - Add EphemeralIndexService for temporary indexes with TTL support - Automatic deletion after specified time-to-live expires - Support for extending TTL of existing ephemeral indexes - Proper cleanup on service shutdown via DisposableBean - Useful for batch processing and temporary data analysis - Add comprehensive integration tests using TestContainers - IndexMigrationServiceIntegrationTest: Validates blue-green migration with real aliasing - EphemeralIndexServiceIntegrationTest: Tests TTL expiration and extension - CustomIndexResolverIntegrationTest: Validates custom index resolver functionality All tests passing (1611 tests, 100% success rate)
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‎redis-om-spring/src/main/java/com/redis/om/spring/indexing/EphemeralIndexService.java‎

Lines changed: 189 additions & 0 deletions
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@@ -0,0 +1,189 @@
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package com.redis.om.spring.indexing;
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import java.time.Duration;
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import java.time.Instant;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ScheduledExecutorService;
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import java.util.concurrent.ScheduledFuture;
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import java.util.concurrent.TimeUnit;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.beans.factory.DisposableBean;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Component;
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/**
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* Service for managing ephemeral (temporary) indexes with TTL support.
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* Ephemeral indexes are automatically deleted after a specified time period.
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*/
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@Component
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public class EphemeralIndexService implements DisposableBean {
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private static final Logger logger = LoggerFactory.getLogger(EphemeralIndexService.class);
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private final RediSearchIndexer indexer;
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private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(2);
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private final ConcurrentHashMap<String, EphemeralIndexInfo> ephemeralIndexes = new ConcurrentHashMap<>();
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@Autowired
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public EphemeralIndexService(RediSearchIndexer indexer) {
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this.indexer = indexer;
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}
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/**
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* Creates an ephemeral index that will be automatically deleted after the specified TTL.
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*
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* @param entityClass the entity class for the index
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* @param indexName the name of the index to create
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* @param ttl the time-to-live for the index
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* @return true if the index was created successfully, false otherwise
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*/
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public boolean createEphemeralIndex(Class<?> entityClass, String indexName, Duration ttl) {
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logger.info(String.format("Creating ephemeral index %s for %s with TTL %s", indexName, entityClass.getName(), ttl));
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try {
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// Create the index
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String keyPrefix = entityClass.getSimpleName().toLowerCase() + ":ephemeral:";
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indexer.createIndexFor(entityClass, indexName, keyPrefix);
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// Schedule deletion
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ScheduledFuture<?> deletionFuture = scheduler.schedule(() -> {
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deleteEphemeralIndex(entityClass, indexName);
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}, ttl.toMillis(), TimeUnit.MILLISECONDS);
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// Track the ephemeral index
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EphemeralIndexInfo info = new EphemeralIndexInfo(entityClass, indexName, Instant.now(), ttl, deletionFuture);
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ephemeralIndexes.put(indexName, info);
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logger.info(String.format("Successfully created ephemeral index %s", indexName));
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return true;
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} catch (Exception e) {
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logger.error(String.format("Failed to create ephemeral index %s: %s", indexName, e.getMessage()));
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return false;
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}
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}
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/**
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* Extends the TTL of an existing ephemeral index.
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*
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* @param indexName the name of the index to extend
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* @param newTtl the new time-to-live duration
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* @return true if the TTL was extended successfully, false otherwise
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*/
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public boolean extendTTL(String indexName, Duration newTtl) {
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EphemeralIndexInfo info = ephemeralIndexes.get(indexName);
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if (info == null) {
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logger.warn(String.format("Cannot extend TTL for non-ephemeral index %s", indexName));
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return false;
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}
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try {
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// Cancel the existing deletion task
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if (info.deletionFuture != null && !info.deletionFuture.isDone()) {
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info.deletionFuture.cancel(false);
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}
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// Schedule new deletion
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ScheduledFuture<?> newDeletionFuture = scheduler.schedule(() -> {
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deleteEphemeralIndex(info.entityClass, indexName);
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}, newTtl.toMillis(), TimeUnit.MILLISECONDS);
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// Update the tracking info
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info.ttl = newTtl;
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info.deletionFuture = newDeletionFuture;
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info.extendedAt = Instant.now();
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logger.info(String.format("Extended TTL for ephemeral index %s to %s", indexName, newTtl));
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return true;
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} catch (Exception e) {
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logger.error(String.format("Failed to extend TTL for index %s: %s", indexName, e.getMessage()));
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return false;
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}
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}
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/**
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* Checks if an index is tracked as ephemeral.
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*
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* @param indexName the name of the index to check
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* @return true if the index is ephemeral, false otherwise
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*/
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public boolean isEphemeralIndex(String indexName) {
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return ephemeralIndexes.containsKey(indexName);
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}
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/**
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* Deletes an ephemeral index immediately.
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*
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* @param entityClass the entity class of the index
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* @param indexName the name of the index to delete
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*/
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private void deleteEphemeralIndex(Class<?> entityClass, String indexName) {
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try {
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logger.info(String.format("Deleting ephemeral index %s", indexName));
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// Drop the index
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indexer.dropIndexFor(entityClass, indexName);
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// Remove from tracking
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EphemeralIndexInfo removed = ephemeralIndexes.remove(indexName);
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if (removed != null && removed.deletionFuture != null && !removed.deletionFuture.isDone()) {
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removed.deletionFuture.cancel(false);
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}
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logger.info(String.format("Successfully deleted ephemeral index %s", indexName));
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} catch (Exception e) {
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logger.error(String.format("Failed to delete ephemeral index %s: %s", indexName, e.getMessage()));
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}
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}
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/**
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* Cleans up all ephemeral indexes and shuts down the scheduler.
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*/
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@Override
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public void destroy() {
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logger.info("Shutting down EphemeralIndexService");
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// Cancel all scheduled deletions
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ephemeralIndexes.values().forEach(info -> {
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if (info.deletionFuture != null && !info.deletionFuture.isDone()) {
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info.deletionFuture.cancel(false);
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}
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});
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// Clear tracking
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ephemeralIndexes.clear();
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// Shutdown scheduler
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scheduler.shutdown();
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try {
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if (!scheduler.awaitTermination(5, TimeUnit.SECONDS)) {
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scheduler.shutdownNow();
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}
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} catch (InterruptedException e) {
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scheduler.shutdownNow();
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Thread.currentThread().interrupt();
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}
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}
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/**
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* Internal class to track ephemeral index information.
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*/
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private static class EphemeralIndexInfo {
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final Class<?> entityClass;
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final String indexName;
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final Instant createdAt;
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Duration ttl;
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ScheduledFuture<?> deletionFuture;
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Instant extendedAt;
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EphemeralIndexInfo(Class<?> entityClass, String indexName, Instant createdAt, Duration ttl,
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ScheduledFuture<?> deletionFuture) {
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this.entityClass = entityClass;
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this.indexName = indexName;
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this.createdAt = createdAt;
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this.ttl = ttl;
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this.deletionFuture = deletionFuture;
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}
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}
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}

‎redis-om-spring/src/main/java/com/redis/om/spring/indexing/IndexMigrationService.java‎

Lines changed: 18 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -243,9 +243,24 @@ public boolean switchAlias(Class<?> entityClass, String newIndexName) {
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return false;
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}
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246-
// In a real implementation, this would update Redis aliases
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// to atomically switch from old to new index
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return true;
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String aliasName = entityClass.getSimpleName().toLowerCase() + "_alias";
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String oldIndexName = indexer.getIndexName(entityClass);
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try {
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// Remove alias from old index if it exists
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if (oldIndexName != null) {
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indexer.removeAlias(oldIndexName, aliasName);
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}
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// Add alias to new index
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indexer.createAlias(newIndexName, aliasName);
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logger.info(String.format("Successfully switched alias %s from %s to %s", aliasName, oldIndexName, newIndexName));
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return true;
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} catch (Exception e) {
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logger.error(String.format("Failed to switch alias %s to %s: %s", aliasName, newIndexName, e.getMessage()));
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return false;
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}
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}
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/**

‎redis-om-spring/src/main/java/com/redis/om/spring/indexing/RediSearchIndexer.java‎

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@@ -2021,4 +2021,64 @@ public boolean indexExistsFor(Class<?> entityClass, String indexName) {
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return false;
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}
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}
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/**
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* Creates an alias for a Redis search index.
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*
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* @param indexName the name of the index to create an alias for
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* @param aliasName the name of the alias to create
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* @return true if the alias was created successfully, false otherwise
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*/
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public boolean createAlias(String indexName, String aliasName) {
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try {
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SearchOperations<String> opsForSearch = rmo.opsForSearch(indexName);
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opsForSearch.addAlias(aliasName);
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logger.info(String.format("Created alias %s for index %s", aliasName, indexName));
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return true;
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} catch (Exception e) {
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logger.error(String.format("Failed to create alias %s for index %s: %s", aliasName, indexName, e.getMessage()));
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return false;
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}
2042+
}
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/**
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* Removes an alias from a Redis search index.
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*
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* @param indexName the name of the index to remove the alias from (not used by Redis, kept for API consistency)
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* @param aliasName the name of the alias to remove
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* @return true if the alias was removed successfully, false otherwise
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*/
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public boolean removeAlias(String indexName, String aliasName) {
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try {
2053+
// Note: deleteAlias doesn't need the index name, it just needs the alias
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SearchOperations<String> opsForSearch = rmo.opsForSearch(indexName);
2055+
opsForSearch.deleteAlias(aliasName);
2056+
logger.info(String.format("Removed alias %s", aliasName));
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return true;
2058+
} catch (Exception e) {
2059+
// Alias might not exist, which is fine
2060+
logger.debug(String.format("Failed to remove alias %s: %s", aliasName, e.getMessage()));
2061+
return false;
2062+
}
2063+
}
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2065+
/**
2066+
* Updates an alias to point to a new index.
2067+
*
2068+
* @param oldIndexName the current index the alias points to (not used by Redis, kept for API consistency)
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* @param newIndexName the new index the alias should point to
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* @param aliasName the name of the alias to update
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* @return true if the alias was updated successfully, false otherwise
2072+
*/
2073+
public boolean updateAlias(String oldIndexName, String newIndexName, String aliasName) {
2074+
try {
2075+
SearchOperations<String> opsForSearch = rmo.opsForSearch(newIndexName);
2076+
opsForSearch.updateAlias(aliasName);
2077+
logger.info(String.format("Updated alias %s to point to index %s", aliasName, newIndexName));
2078+
return true;
2079+
} catch (Exception e) {
2080+
logger.error(String.format("Failed to update alias %s to %s: %s", aliasName, newIndexName, e.getMessage()));
2081+
return false;
2082+
}
2083+
}
20242084
}

‎tests/src/test/java/com/redis/om/spring/indexing/CustomIndexResolverIntegrationTest.java‎

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package com.redis.om.spring.indexing;
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import static org.assertj.core.api.Assertions.assertThat;
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import org.junit.jupiter.api.Test;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.test.annotation.DirtiesContext;
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import org.springframework.data.annotation.Id;
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import com.redis.om.spring.AbstractBaseDocumentTest;
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import com.redis.om.spring.annotations.Document;
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import com.redis.om.spring.annotations.Indexed;
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/**
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* Integration test for custom IndexResolver implementations.
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*/
17+
@DirtiesContext
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public class CustomIndexResolverIntegrationTest extends AbstractBaseDocumentTest {
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20+
@Autowired
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private RediSearchIndexer indexer;
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@Test
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void testIndexResolverWithCustomPrefix() throws InterruptedException {
25+
// Given: First ensure the test entity doesn't have an index already
26+
if (indexer.indexExistsFor(CustomResolverTestEntity.class)) {
27+
indexer.dropIndexFor(CustomResolverTestEntity.class);
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}
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30+
// Give time for drop to complete
31+
Thread.sleep(500);
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// Given: A custom IndexResolver that adds a prefix
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IndexResolver customResolver = new IndexResolver() {
35+
@Override
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public String resolveIndexName(Class<?> entityClass, RedisIndexContext context) {
37+
return "custom_" + entityClass.getSimpleName() + "_idx";
38+
}
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40+
@Override
41+
public String resolveKeyPrefix(Class<?> entityClass, RedisIndexContext context) {
42+
return "custom:" + entityClass.getSimpleName().toLowerCase() + ":";
43+
}
44+
};
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46+
// When: Create index using the custom resolver
47+
String indexName = customResolver.resolveIndexName(CustomResolverTestEntity.class, null);
48+
String keyPrefix = customResolver.resolveKeyPrefix(CustomResolverTestEntity.class, null);
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50+
boolean created = indexer.createIndexFor(CustomResolverTestEntity.class, indexName, keyPrefix);
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// Then: Index should be created with custom name
53+
assertThat(indexName).isEqualTo("custom_CustomResolverTestEntity_idx");
54+
assertThat(created).as("Index creation should succeed").isTrue();
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56+
// Give time for index creation to complete
57+
Thread.sleep(500);
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59+
assertThat(indexer.indexExistsFor(CustomResolverTestEntity.class, indexName))
60+
.as("Index should exist after creation").isTrue();
61+
62+
// Cleanup
63+
indexer.dropIndexFor(CustomResolverTestEntity.class, indexName);
64+
}
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66+
@Document
67+
static class CustomResolverTestEntity {
68+
@Id
69+
private String id;
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71+
@Indexed
72+
private String name;
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74+
public String getId() { return id; }
75+
public void setId(String id) { this.id = id; }
76+
public String getName() { return name; }
77+
public void setName(String name) { this.name = name; }
78+
}
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}

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