AsynchronousFileByteChannel Class — spring-boot Architecture

Source Code

buildpack/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/socket/NamedPipeSocket.java lines 117–192

	private static class AsynchronousFileByteChannel implements AsynchronousByteChannel {

		private final AsynchronousFileChannel fileChannel;

		AsynchronousFileByteChannel(AsynchronousFileChannel fileChannel) {
			this.fileChannel = fileChannel;
		}

		@Override
		public <A> void read(ByteBuffer dst, A attachment, CompletionHandler<Integer, ? super A> handler) {
			this.fileChannel.read(dst, 0, attachment, new CompletionHandler<>() {

				@Override
				public void completed(Integer read, A attachment) {
					handler.completed((read > 0) ? read : -1, attachment);
				}

				@Override
				public void failed(Throwable exc, A attachment) {
					if (exc instanceof AsynchronousCloseException) {
						handler.completed(-1, attachment);
						return;
					}
					handler.failed(exc, attachment);
				}

			});
		}

		@Override
		public Future<Integer> read(ByteBuffer dst) {
			CompletableFutureHandler future = new CompletableFutureHandler();
			this.fileChannel.read(dst, 0, null, future);
			return future;
		}

		@Override
		public <A> void write(ByteBuffer src, A attachment, CompletionHandler<Integer, ? super A> handler) {
			this.fileChannel.write(src, 0, attachment, handler);
		}

		@Override
		public Future<Integer> write(ByteBuffer src) {
			return this.fileChannel.write(src, 0);
		}

		@Override
		public void close() throws IOException {
			this.fileChannel.close();
		}

		@Override
		public boolean isOpen() {
			return this.fileChannel.isOpen();
		}

		private static final class CompletableFutureHandler extends CompletableFuture<Integer>
				implements CompletionHandler<Integer, Object> {

			@Override
			public void completed(Integer read, Object attachment) {
				complete((read > 0) ? read : -1);
			}

			@Override
			public void failed(Throwable exc, Object attachment) {
				if (exc instanceof AsynchronousCloseException) {
					complete(-1);
					return;
				}
				completeExceptionally(exc);
			}

		}

	}