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AsynchronousFileChannel: 类图
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‎README.md

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@@ -46,3 +46,5 @@ JDK源码阅读笔记
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[Reflection](https://github.com/seaswalker/JDK/blob/master/note/Reflection/reflection.md)
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[ScheduledThreadPool](https://github.com/seaswalker/JDK/blob/master/note/ScheduledThreadPool/scheduledthreadpool.md)
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[AsynchronousFileChannel](https://github.com/seaswalker/JDK/blob/master/note/AsynchronousFileChannel/asynchronousfilechannel.md)

‎note/AsynchronousFileChannel/asynchronousfilechannel.md

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异步的文件通道，FileChannel属于"同步非阻塞"，AsynchronousFileChannel才是真正的异步。
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![AsynchronousFileChannel](images/AsynchronousFileChannel.jpg)
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从主要方法read/write的返回值为Future可以看出其"异步"的端倪。
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# open
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```java
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public static AsynchronousFileChannel open(Path file,
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Set<? extends OpenOption> options,
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ExecutorService executor,
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FileAttribute<?>... attrs) {
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FileSystemProvider provider = file.getFileSystem().provider();
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return provider.newAsynchronousFileChannel(file, options, executor, attrs);
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}
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```
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另外一个重载的简化方法声明如下:
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```java
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public static AsynchronousFileChannel open(Path file, OpenOption... options) {}
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```
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所做的处理便是将可变参数options手动转为Set，executor为null，文件属性为NO_ATTRIBUTES，其实就是一个空的数组。

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