org.apache.kafka.streams.state.internals.WrappingStoreProvider Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.apache.kafka.streams.state.internals;
import org.apache.kafka.streams.StoreQueryParameters;
import org.apache.kafka.streams.errors.InvalidStateStoreException;
import org.apache.kafka.streams.errors.InvalidStateStorePartitionException;
import org.apache.kafka.streams.state.QueryableStoreType;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* Provides a wrapper over multiple underlying {@link StateStoreProvider}s
*/
public class WrappingStoreProvider implements StateStoreProvider {
private final Collection storeProviders;
private StoreQueryParameters storeQueryParameters;
WrappingStoreProvider(final Collection storeProviders,
final StoreQueryParameters storeQueryParameters) {
this.storeProviders = storeProviders;
this.storeQueryParameters = storeQueryParameters;
}
//visible for testing
public void setStoreQueryParameters(final StoreQueryParameters storeQueryParameters) {
this.storeQueryParameters = storeQueryParameters;
}
@Override
public List stores(final String storeName,
final QueryableStoreType queryableStoreType) {
final List allStores = new ArrayList<>();
for (final StreamThreadStateStoreProvider storeProvider : storeProviders) {
final List stores = storeProvider.stores(storeQueryParameters);
if (!stores.isEmpty()) {
allStores.addAll(stores);
if (storeQueryParameters.partition() != null) {
break;
}
}
}
if (allStores.isEmpty()) {
if (storeQueryParameters.partition() != null) {
throw new InvalidStateStorePartitionException(
String.format("The specified partition %d for store %s does not exist.",
storeQueryParameters.partition(),
storeName));
}
throw new InvalidStateStoreException("The state store, " + storeName + ", may have migrated to another instance.");
}
return allStores;
}
}