kafka Receive 源码
kafka Receive 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/network/Receive.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.common.network;
import java.io.Closeable;
import java.io.IOException;
import java.nio.channels.ScatteringByteChannel;
/**
* This interface models the in-progress reading of data from a channel to a source identified by an integer id
*/
public interface Receive extends Closeable {
/**
* The numeric id of the source from which we are receiving data.
*/
String source();
/**
* Are we done receiving data?
*/
boolean complete();
/**
* Read bytes into this receive from the given channel
* @param channel The channel to read from
* @return The number of bytes read
* @throws IOException If the reading fails
*/
long readFrom(ScatteringByteChannel channel) throws IOException;
/**
* Do we know yet how much memory we require to fully read this
*/
boolean requiredMemoryAmountKnown();
/**
* Has the underlying memory required to complete reading been allocated yet?
*/
boolean memoryAllocated();
}
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