FileSystem and Screen lib realization [try 2]

screen/src/main/java/ScreenLib.java

@@ -0,0 +1,65 @@
+import java.io.IOException;
+import java.nio.file.Path;
+
+/**
+ * Realization of class dedicated to the control
+ * of GNU Screen sessions
+ * <p>
+ * Created by daniil on 02.04.16.
+ */
+public class ScreenLib {
+
+    /**
+     * Start a screen with certain ID
+     * and execute a command inside it
+     *
+     * @param screenName Screen ID
+     * @param runPath    Home path of started screen
+     * @param command    Command [+args] to execute inside the screen
+     * @throws IOException
+     */
+    public void startScreen(String screenName, Path runPath, String... command) throws IOException {
+        assert screenName != null && screenName.length() != 0;
+        assert runPath != null;
+
+        // Merge two arrays
+        String[] commandBase = new String[command.length + 3];
+        commandBase[0] = "screen";
+        commandBase[1] = "-dmS";
+        commandBase[2] = screenName;
+
+        System.arraycopy(command, 0, commandBase, 3, command.length);
+
+        ProcessBuilder processBuilder = new ProcessBuilder(commandBase);
+        processBuilder.directory(runPath.toFile());
+        processBuilder.start();
+    }
+
+    /**
+     * Send command to specific screen
+     *
+     * @param screenName Screen ID
+     * @param command    Command to send
+     * @throws IOException
+     */
+    public void sendCommand(String screenName, String command) throws IOException {
+        assert screenName != null;
+        assert command != null;
+
+        ProcessBuilder processBuilder = new ProcessBuilder("screen", "-S", screenName, "-p", "0", "-X", "stuff", String.format(command + "%n"));
+        processBuilder.start();
+    }
+
+    /**
+     * Force terminate a screen session
+     *
+     * @param screenName Screen ID
+     * @throws IOException
+     */
+    public void killScreen(String screenName) throws IOException {
+        assert screenName != null;
+
+        ProcessBuilder processBuilder = new ProcessBuilder("screen", "-X", "-S", screenName, "quit");
+        processBuilder.start();
+    }
+}