kafka StaticBrokerStrategy 源码
kafka StaticBrokerStrategy 代码
文件路径：/clients/src/main/java/org/apache/kafka/clients/admin/internals/StaticBrokerStrategy.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.clients.admin.internals;
import org.apache.kafka.common.requests.AbstractRequest;
import org.apache.kafka.common.requests.AbstractResponse;
import java.util.OptionalInt;
import java.util.Set;
/**
* This lookup strategy is used when we already know the destination broker ID
* and we have no need for an explicit lookup. By setting {@link ApiRequestScope#destinationBrokerId()}
* in the returned value for {@link #lookupScope(Object)}, the driver will
* skip the lookup.
*/
public class StaticBrokerStrategy<K> implements AdminApiLookupStrategy<K> {
private final SingleBrokerScope scope;
public StaticBrokerStrategy(int brokerId) {
this.scope = new SingleBrokerScope(brokerId);
}
@Override
public ApiRequestScope lookupScope(K key) {
return scope;
}
@Override
public AbstractRequest.Builder<?> buildRequest(Set<K> keys) {
throw new UnsupportedOperationException();
}
@Override
public LookupResult<K> handleResponse(Set<K> keys, AbstractResponse response) {
throw new UnsupportedOperationException();
}
private static class SingleBrokerScope implements ApiRequestScope {
private final int brokerId;
private SingleBrokerScope(int brokerId) {
this.brokerId = brokerId;
}
@Override
public OptionalInt destinationBrokerId() {
return OptionalInt.of(brokerId);
}
}
}
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