spring NamedPipeSocket 源码
springboot NamedPipeSocket 代码
文件路径:/spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/socket/NamedPipeSocket.java
/*
* Copyright 2012-2020 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.boot.buildpack.platform.socket;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousByteChannel;
import java.nio.channels.AsynchronousCloseException;
import java.nio.channels.AsynchronousFileChannel;
import java.nio.channels.Channels;
import java.nio.channels.CompletionHandler;
import java.nio.file.FileSystemException;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.function.Consumer;
import com.sun.jna.Platform;
import com.sun.jna.platform.win32.Kernel32;
/**
* A {@link Socket} implementation for named pipes.
*
* @author Phillip Webb
* @author Scott Frederick
* @since 2.3.0
*/
public class NamedPipeSocket extends Socket {
private static final int WAIT_INTERVAL = 100;
private static final long TIMEOUT = TimeUnit.MILLISECONDS.toNanos(1000);
private final AsynchronousFileByteChannel channel;
NamedPipeSocket(String path) throws IOException {
this.channel = open(path);
}
private AsynchronousFileByteChannel open(String path) throws IOException {
Consumer<String> awaiter = Platform.isWindows() ? new WindowsAwaiter() : new SleepAwaiter();
long startTime = System.nanoTime();
while (true) {
try {
return new AsynchronousFileByteChannel(AsynchronousFileChannel.open(Paths.get(path),
StandardOpenOption.READ, StandardOpenOption.WRITE));
}
catch (FileSystemException ex) {
if (System.nanoTime() - startTime >= TIMEOUT) {
throw ex;
}
awaiter.accept(path);
}
}
}
@Override
public InputStream getInputStream() {
return Channels.newInputStream(this.channel);
}
@Override
public OutputStream getOutputStream() {
return Channels.newOutputStream(this.channel);
}
@Override
public void close() throws IOException {
if (this.channel != null) {
this.channel.close();
}
}
/**
* Return a new {@link NamedPipeSocket} for the given path.
* @param path the path to the domain socket
* @return a {@link NamedPipeSocket} instance
* @throws IOException if the socket cannot be opened
*/
public static NamedPipeSocket get(String path) throws IOException {
return new NamedPipeSocket(path);
}
/**
* Adapt an {@code AsynchronousByteChannel} to an {@code AsynchronousFileChannel}.
*/
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<Integer, A>() {
@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 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);
}
}
}
/**
* Waits for the name pipe file using a simple sleep.
*/
private static class SleepAwaiter implements Consumer<String> {
@Override
public void accept(String path) {
try {
Thread.sleep(WAIT_INTERVAL);
}
catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
}
}
/**
* Waits for the name pipe file using Windows specific logic.
*/
private static class WindowsAwaiter implements Consumer<String> {
@Override
public void accept(String path) {
Kernel32.INSTANCE.WaitNamedPipe(path, WAIT_INTERVAL);
}
}
}
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- 本文标签: Spring Boot Java Spring
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