Example usage for java.nio.channels AsynchronousFileChannel read

Introduction

In this page you can find the example usage for java.nio.channels AsynchronousFileChannel read.

Prototype

public abstract Future<Integer> read(ByteBuffer dst, long position);

Source Link

Document

Reads a sequence of bytes from this channel into the given buffer, starting at the given file position.

Usage

From source file:Test.java

public static void main(String[] args) throws Exception {
    Path file = Paths.get("/usr/a.txt");
    AsynchronousFileChannel channel = AsynchronousFileChannel.open(file);

    ByteBuffer buffer = ByteBuffer.allocate(100_000);
    Future<Integer> result = channel.read(buffer, 0);

    while (!result.isDone()) {
        ProfitCalculator.calculateTax();
    }/*from   w ww.  ja  va  2s  .c o  m*/
    Integer bytesRead = result.get();
    System.out.println("Bytes read [" + bytesRead + "]");
}

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