Merge branch 'master' into JAVA-7244-Review_log_statements_for_projects

core-java-modules/core-java-networking-3/src/main/java/com/baeldung/socket/UnixDomainSocketClient.java

@@ -0,0 +1,49 @@
+package com.baeldung.socket;
+
+import java.io.IOException;
+import java.net.StandardProtocolFamily;
+import java.net.UnixDomainSocketAddress;
+import java.nio.ByteBuffer;
+import java.nio.channels.SocketChannel;
+import java.nio.file.Path;
+
+class UnixDomainSocketClient {
+
+    public static void main(String[] args) throws Exception {
+        new UnixDomainSocketClient().runClient();
+    }
+
+    void runClient() throws IOException {
+        Path socketPath = Path.of(System.getProperty("user.home"))
+          .resolve("baeldung.socket");
+        UnixDomainSocketAddress socketAddress = getAddress(socketPath);
+
+        SocketChannel channel = openSocketChannel(socketAddress);
+
+        String message = "Hello from Baeldung Unix domain socket article";
+        writeMessage(channel, message);
+    }
+
+    UnixDomainSocketAddress getAddress(Path socketPath) {
+        return UnixDomainSocketAddress.of(socketPath);
+    }
+
+    SocketChannel openSocketChannel(UnixDomainSocketAddress socketAddress) throws IOException {
+        SocketChannel channel = SocketChannel
+          .open(StandardProtocolFamily.UNIX);
+        channel.connect(socketAddress);
+        return channel;
+    }
+
+    void writeMessage(SocketChannel socketChannel, String message) throws IOException {
+        ByteBuffer buffer = ByteBuffer.allocate(1024);
+        buffer.clear();
+        buffer.put(message.getBytes());
+        buffer.flip();
+
+        while (buffer.hasRemaining()) {
+            socketChannel.write(buffer);
+        }
+    }
+
+}

core-java-modules/core-java-networking-3/src/main/java/com/baeldung/socket/UnixDomainSocketServer.java

@@ -0,0 +1,57 @@
+package com.baeldung.socket;
+
+import java.io.IOException;
+import java.net.StandardProtocolFamily;
+import java.net.UnixDomainSocketAddress;
+import java.nio.ByteBuffer;
+import java.nio.channels.ServerSocketChannel;
+import java.nio.channels.SocketChannel;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Optional;
+
+class UnixDomainSocketServer {
+
+    public static void main(String[] args) throws IOException, InterruptedException {
+        new UnixDomainSocketServer().runServer();
+    }
+
+    void runServer() throws IOException, InterruptedException {
+        Path socketPath = Path.of(System.getProperty("user.home"))
+          .resolve("baeldung.socket");
+        Files.deleteIfExists(socketPath);
+        UnixDomainSocketAddress socketAddress = getAddress(socketPath);
+
+        ServerSocketChannel serverChannel = createServerSocketChannel(socketAddress);
+
+        SocketChannel channel = serverChannel.accept();
+
+        while (true) {
+            readSocketMessage(channel)
+              .ifPresent(message -> System.out.printf("[Client message] %s%n", message));
+            Thread.sleep(100);
+        }
+    }
+
+    UnixDomainSocketAddress getAddress(Path socketPath) {
+        return UnixDomainSocketAddress.of(socketPath);
+    }
+
+    ServerSocketChannel createServerSocketChannel(UnixDomainSocketAddress socketAddress) throws IOException {
+        ServerSocketChannel serverChannel = ServerSocketChannel.open(StandardProtocolFamily.UNIX);
+        serverChannel.bind(socketAddress);
+        return serverChannel;
+    }
+
+    Optional<String> readSocketMessage(SocketChannel channel) throws IOException {
+        ByteBuffer buffer = ByteBuffer.allocate(1024);
+        int bytesRead = channel.read(buffer);
+        if (bytesRead < 0) return Optional.empty();
+        byte[] bytes = new byte[bytesRead];
+        buffer.flip();
+        buffer.get(bytes);
+        String message = new String(bytes);
+        return Optional.of(message);
+    }
+
+}