Add message to UI if there are other running instances of Polypheny

control-connector/src/main/java/org/polypheny/control/client/PolyphenyControlConnector.java

@@ -174,8 +174,8 @@ String getStatus() {
     }
 
 
-    boolean checkForAnyRunningPolyphenyInstances() {
-        return Boolean.parseBoolean( executeGet( "/control/checkAnyRunningPolyphenyInstances" ) );
+    int checkForAnyRunningPolyphenyInstances() {
+        return Integer.parseInt( executeGet( "/control/checkAnyRunningPolyphenyInstances" ) );
     }
 
 

src/main/java/org/polypheny/control/control/Control.java

@@ -33,6 +33,7 @@
 import java.util.Map.Entry;
 import java.util.NoSuchElementException;
 import lombok.NonNull;
+import org.apache.commons.lang3.SystemUtils;
 import org.polypheny.control.httpinterface.ClientCommunicationStream;
 
 
@@ -163,6 +164,15 @@ public void checkAnyRunningPolyphenyInstances( Context ctx ) {
     }
 
 
+    public int getNumberOfOtherRunningPolyphenyInstances() {
+        if ( !SystemUtils.IS_OS_WINDOWS ) {
+            return ServiceManager.getPidOfOtherRunningPolyphenyInstances().size();
+        } else {
+            return -1;
+        }
+    }
+
+
     public void getVersion( Context ctx ) {
         ctx.result( gson.toJson( ServiceManager.getVersion() ) );
     }

src/main/java/org/polypheny/control/control/ServiceManager.java

@@ -1018,6 +1018,18 @@ public static List<Integer> getPidOfRunningPolyphenyInstances() {
     }
 
 
+    public static List<Integer> getPidOfOtherRunningPolyphenyInstances() {
+        if ( SystemUtils.IS_OS_WINDOWS ) {
+            throw new RuntimeException( "This operation is not supported on Windows" );
+        }
+        List<Integer> pids = getPidOfRunningPolyphenyInstances();
+        if ( polyphenyDbProcess != null ) {
+            pids.remove( Integer.valueOf( polyphenyDbProcess.getPid() ) );
+        }
+        return pids;
+    }
+
+
     private static boolean existsLocalBranchWithName( Git git, String branchName ) throws GitAPIException {
         List<Ref> branches = git.branchList().call();
         for ( Ref ref : branches ) {

src/main/java/org/polypheny/control/httpinterface/Server.java

@@ -171,6 +171,13 @@ public Server( Control control, int port ) {
                 5,
                 TimeUnit.SECONDS );
 
+        // For switching background color when there are other polypheny instances running on this host
+        exec.scheduleAtFixedRate(
+                () -> ClientRegistry.broadcast( "numberOfOtherRunningPolyphenyInstances", "" + control.getNumberOfOtherRunningPolyphenyInstances() ),
+                0,
+                5,
+                TimeUnit.SECONDS );
+
         // Periodically sent versions to clients
         exec.scheduleAtFixedRate(
                 () -> ClientRegistry.broadcast( "version", ServiceManager.getVersion() ),

src/main/resources/static/index.html

@@ -29,6 +29,7 @@
 <div class="root">
     <div class="main">
         <h1 class="heading">Polypheny Control</h1>
+        <h2 id="error-header" style="display: none;"></h2>
 
         <div id="dashboardContent">
             <table width="80%" class="dashboard" border="0">

src/main/resources/static/script.js

@@ -81,6 +81,14 @@ webSocket.onmessage = function (msg) {
             $( "body" ).css( "background-color", "#3B83C8" );
         }
     }
+    if ( data.hasOwnProperty( "numberOfOtherRunningPolyphenyInstances" ) ) { // Periodically sent by server to keep the connection open
+        if ( data["numberOfOtherRunningPolyphenyInstances"] > 0 ) {
+            $( '#error-header' ).show();
+            $( '#error-header' ).html( "There are other running instances of Polypheny on this host!" );
+        } else {
+            $( '#error-header' ).hide();
+        }
+    }
     if ( data.hasOwnProperty( "version" ) ) { // Periodically sent by server to keep the connection open
         var pdbString = "PDB: " + data["version"]["pdb-branch"] + " @ " + data["version"]["pdb-commit"].substring( 0, 7 );
         var puiString = "PUI: " + data["version"]["pui-branch"] + " @ " + data["version"]["pui-commit"].substring( 0, 7 );
@@ -444,20 +452,6 @@ $( document ).ready( function () {
 // Update version
 getControlVersion();
 
-// Change bg color
-$( document ).on( 'keyup', function ( e ) {
-    if ( debug ) {
-        console.log( $( "body" ).css( "background-color" ) );
-    }
-    if ( e.which === 112 && $( "body" ).css( "background-color" ) !== "rgb(128, 128, 128)" ) {
-        if ( $( "body" ).css( "background-color" ) === "rgb(165, 215, 210)" ) {
-            $( 'body' ).css( 'background-color', "#3B83C8" );
-        } else {
-            $('body').css('background-color', "#A5D7D2");
-        }
-    }
-});
-
 // Initial adjust on page load
 window.onload = adjustFooterPosition;
 $(document).ready(function() {

src/main/resources/static/style.css

@@ -114,6 +114,15 @@ body {
     margin-top: 0;
 }
 
+#error-header {
+    text-align: center;
+    font-family: sans-serif;
+    font-size: min(2.5vw, 40px);
+    margin-bottom: 2.5vh;
+    margin-top: 0;
+    color: #d40418;
+}
+
 .content {
     margin-left: auto;
     margin-right: auto;