add WinUpdateProcess.java to the java src's

java/net/i2p/router/WinUpdateProcess.java

@@ -0,0 +1,35 @@
+package net.i2p.router;
+
+import net.i2p.router.*;
+import net.i2p.I2PAppContext;
+
+import java.util.function.*;
+import java.io.*;
+import net.i2p.util.Log;
+
+class WinUpdateProcess implements Runnable {
+    private final Log _log = I2PAppContext.getGlobalContext().logManager().getLog(WinUpdateProcess.class);
+    private final RouterContext ctx;
+    private final Supplier<String> versionSupplier;
+    private final File file = null;
+    
+    WinUpdateProcess(RouterContext ctx, Supplier<String> versionSupplier, File file) {
+        this.ctx = ctx;
+        this.versionSupplier = versionSupplier;
+    }
+
+    private void runUpdateInstaller(File file){
+        ProcessBuilder pb = new ProcessBuilder("cmd", "/c", file.getAbsolutePath(), "/S");
+        try {
+            pb.start();
+        } catch (IOException ex) {
+            if (_log.shouldWarn())
+                _log.warn("Unable to run update-program in background. Update will fail.");
+        }
+    }
+
+    @Override
+    public void run() {
+        runUpdateInstaller(file);
+    }
+}