Blocks until the write operation has completed in AsynchronousFileChannel - Java Network

Java examples for Network:Asynchronous Server

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Description

Blocks until the write operation has completed in AsynchronousFileChannel

Demo Code

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousFileChannel;
import java.nio.channels.CompletionHandler;
import java.nio.channels.WritePendingException;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

public class Main {

  public static void main(String[] args) {
    try (AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(Paths.get("/home/docs/asynchronous.txt"),
        StandardOpenOption.READ, StandardOpenOption.WRITE, StandardOpenOption.CREATE)) {
      CompletionHandler<Integer, Object> handler = new CompletionHandler<Integer, Object>() {

        @Override//from  w  w  w  .ja va  2  s.  co m
        public void completed(Integer result, Object attachment) {
          System.out.println("Attachment: " + attachment + " " + result + " bytes written");
          System.out.println("CompletionHandler Thread ID: " + Thread.currentThread().getId());
        }

        @Override
        public void failed(Throwable e, Object attachment) {
          System.err.println("Attachment: " + attachment + " failed with:");
          e.printStackTrace();
        }
      };

      Future<Integer> writeFuture1 = fileChannel.write(ByteBuffer.wrap("Sample".getBytes()), 0);
      Future<Integer> writeFuture2 = fileChannel.write(ByteBuffer.wrap("Box".getBytes()), 0);

      int result;
      try {
        result = writeFuture1.get();
        System.out.println("Sample write completed with " + result + " bytes written");
        result = writeFuture2.get();
        System.out.println("Box write completed with " + result + " bytes written");
      } catch (InterruptedException ex) {
        ex.printStackTrace();
      } catch (ExecutionException ex) {
        ex.printStackTrace();
      }

    } catch (IOException ex) {
      ex.printStackTrace();
    } catch (WritePendingException ex) {
      ex.printStackTrace();
    }
  }
}

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