spark StreamCallback 源码
spark StreamCallback 代码
文件路径：/common/network-common/src/main/java/org/apache/spark/network/client/StreamCallback.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.spark.network.client;
import java.io.IOException;
import java.nio.ByteBuffer;
/**
* Callback for streaming data. Stream data will be offered to the
* {@link #onData(String, ByteBuffer)} method as it arrives. Once all the stream data is received,
* {@link #onComplete(String)} will be called.
* <p>
* The network library guarantees that a single thread will call these methods at a time, but
* different call may be made by different threads.
*/
public interface StreamCallback {
/** Called upon receipt of stream data. */
void onData(String streamId, ByteBuffer buf) throws IOException;
/** Called when all data from the stream has been received. */
void onComplete(String streamId) throws IOException;
/** Called if there's an error reading data from the stream. */
void onFailure(String streamId, Throwable cause) throws IOException;
}
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