kafka AsyncClient 源码
kafka AsyncClient 代码
文件路径：/clients/src/main/java/org/apache/kafka/clients/consumer/internals/AsyncClient.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.consumer.internals;
import org.apache.kafka.clients.ClientResponse;
import org.apache.kafka.common.Node;
import org.apache.kafka.common.requests.AbstractRequest;
import org.apache.kafka.common.requests.AbstractResponse;
import org.apache.kafka.common.utils.LogContext;
import org.slf4j.Logger;
public abstract class AsyncClient<T1, Req extends AbstractRequest, Resp extends AbstractResponse, T2> {
private final Logger log;
private final ConsumerNetworkClient client;
AsyncClient(ConsumerNetworkClient client, LogContext logContext) {
this.client = client;
this.log = logContext.logger(getClass());
}
public RequestFuture<T2> sendAsyncRequest(Node node, T1 requestData) {
AbstractRequest.Builder<Req> requestBuilder = prepareRequest(node, requestData);
return client.send(node, requestBuilder).compose(new RequestFutureAdapter<ClientResponse, T2>() {
@Override
@SuppressWarnings("unchecked")
public void onSuccess(ClientResponse value, RequestFuture<T2> future) {
Resp resp;
try {
resp = (Resp) value.responseBody();
} catch (ClassCastException cce) {
log.error("Could not cast response body", cce);
future.raise(cce);
return;
}
log.trace("Received {} {} from broker {}", resp.getClass().getSimpleName(), resp, node);
try {
future.complete(handleResponse(node, requestData, resp));
} catch (RuntimeException e) {
if (!future.isDone()) {
future.raise(e);
}
}
}
@Override
public void onFailure(RuntimeException e, RequestFuture<T2> future1) {
future1.raise(e);
}
});
}
protected Logger logger() {
return log;
}
protected abstract AbstractRequest.Builder<Req> prepareRequest(Node node, T1 requestData);
protected abstract T2 handleResponse(Node node, T1 requestData, Resp response);
}
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