spring DataBufferFactory 源码
spring DataBufferFactory 代码
文件路径：/spring-core/src/main/java/org/springframework/core/io/buffer/DataBufferFactory.java
/*
* Copyright 2002-2018 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.core.io.buffer;
import java.nio.ByteBuffer;
import java.util.List;
/**
* A factory for {@link DataBuffer DataBuffers}, allowing for allocation and
* wrapping of data buffers.
*
* @author Arjen Poutsma
* @since 5.0
* @see DataBuffer
*/
public interface DataBufferFactory {
/**
* Allocate a data buffer of a default initial capacity. Depending on the
* underlying implementation and its configuration, this will be heap-based
* or direct buffer.
* @return the allocated buffer
*/
DataBuffer allocateBuffer();
/**
* Allocate a data buffer of the given initial capacity. Depending on the
* underlying implementation and its configuration, this will be heap-based
* or direct buffer.
* @param initialCapacity the initial capacity of the buffer to allocate
* @return the allocated buffer
*/
DataBuffer allocateBuffer(int initialCapacity);
/**
* Wrap the given {@link ByteBuffer} in a {@code DataBuffer}. Unlike
* {@linkplain #allocateBuffer(int) allocating}, wrapping does not use new memory.
* @param byteBuffer the NIO byte buffer to wrap
* @return the wrapped buffer
*/
DataBuffer wrap(ByteBuffer byteBuffer);
/**
* Wrap the given {@code byte} array in a {@code DataBuffer}. Unlike
* {@linkplain #allocateBuffer(int) allocating}, wrapping does not use new memory.
* @param bytes the byte array to wrap
* @return the wrapped buffer
*/
DataBuffer wrap(byte[] bytes);
/**
* Return a new {@code DataBuffer} composed of the {@code dataBuffers} elements joined together.
* Depending on the implementation, the returned buffer may be a single buffer containing all
* data of the provided buffers, or it may be a true composite that contains references to the
* buffers.
* <p>Note that the given data buffers do <strong>not</strong> have to be released, as they are
* released as part of the returned composite.
* @param dataBuffers the data buffers to be composed
* @return a buffer that is composed of the {@code dataBuffers} argument
* @since 5.0.3
*/
DataBuffer join(List<? extends DataBuffer> dataBuffers);
}
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