kafka GlobalStateStoreProvider 源码
kafka GlobalStateStoreProvider 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/state/internals/GlobalStateStoreProvider.java
/*
* 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.errors.InvalidStateStoreException;
import org.apache.kafka.streams.processor.StateStore;
import org.apache.kafka.streams.state.QueryableStoreType;
import org.apache.kafka.streams.state.QueryableStoreTypes;
import org.apache.kafka.streams.state.TimestampedKeyValueStore;
import org.apache.kafka.streams.state.TimestampedWindowStore;
import java.util.Collections;
import java.util.List;
import java.util.Map;
public class GlobalStateStoreProvider implements StateStoreProvider {
private final Map<String, StateStore> globalStateStores;
public GlobalStateStoreProvider(final Map<String, StateStore> globalStateStores) {
this.globalStateStores = globalStateStores;
}
@SuppressWarnings("unchecked")
@Override
public <T> List<T> stores(final String storeName, final QueryableStoreType<T> queryableStoreType) {
final StateStore store = globalStateStores.get(storeName);
if (store == null || !queryableStoreType.accepts(store)) {
return Collections.emptyList();
}
if (!store.isOpen()) {
throw new InvalidStateStoreException("the state store, " + storeName + ", is not open.");
}
if (store instanceof TimestampedKeyValueStore && queryableStoreType instanceof QueryableStoreTypes.KeyValueStoreType) {
return (List<T>) Collections.singletonList(new ReadOnlyKeyValueStoreFacade((TimestampedKeyValueStore<Object, Object>) store));
} else if (store instanceof TimestampedWindowStore && queryableStoreType instanceof QueryableStoreTypes.WindowStoreType) {
return (List<T>) Collections.singletonList(new ReadOnlyWindowStoreFacade((TimestampedWindowStore<Object, Object>) store));
}
return (List<T>) Collections.singletonList(store);
}
}
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