Added displaying Mem usage in Mage.Client

Mage.Client/src/main/java/mage/client/util/stats/MemoryUsageStatUtil.java

@@ -0,0 +1,25 @@
+package mage.client.util.stats;
+
+/**
+ * @author noxx
+ */
+public class MemoryUsageStatUtil {
+
+    private MemoryUsageStatUtil() {}
+
+    /**
+     * Returns percentage of available memory used at runtime.
+     * If not possible to determine, returns -1.
+     *
+     * @return
+     */
+    public static float getMemoryFreeStatPercentage() {
+        Runtime runtime = Runtime.getRuntime();
+        if (runtime.maxMemory() != 0) {
+            long usedMem = runtime.totalMemory() - runtime.freeMemory();
+            return (1 - (1.0f*usedMem)/runtime.maxMemory())*100;
+        } else {
+            return -1;
+        }
+    }
+}

Mage.Client/src/main/java/mage/client/util/stats/UpdateMemUsageTask.java

@@ -0,0 +1,58 @@
+package mage.client.util.stats;
+
+import org.apache.log4j.Logger;
+
+import javax.swing.*;
+import java.util.List;
+import java.util.concurrent.CancellationException;
+import java.util.concurrent.ExecutionException;
+
+/**
+ * This updates the mem usage info in the Mage client every MEM_USAGE_UPDATE_TIME ms.
+ *
+ * @author noxx
+ */
+public class UpdateMemUsageTask extends SwingWorker<Void, Float> {
+
+    private static final int MEM_USAGE_UPDATE_TIME = 2000;
+
+    private JLabel jLabelToDisplayInfo;
+
+    private static final Logger logger = Logger.getLogger(UpdateMemUsageTask.class);
+
+    public UpdateMemUsageTask(JLabel jLabelToDisplayInfo) {
+        this.jLabelToDisplayInfo = jLabelToDisplayInfo;
+    }
+
+    @Override
+    protected Void doInBackground() throws Exception {
+        while (!isCancelled()) {
+            float memUsage = MemoryUsageStatUtil.getMemoryFreeStatPercentage();
+            this.publish(memUsage >= 0 ? Float.valueOf(memUsage) : null);
+            Thread.sleep(MEM_USAGE_UPDATE_TIME);
+        }
+        return null;
+    }
+
+    @Override
+    protected void process(List<Float> chunks) {
+        if (chunks != null && chunks.size() > 0) {
+            Float memUsage = chunks.get(chunks.size() - 1);
+            if (memUsage != null) {
+                jLabelToDisplayInfo.setText(Math.round(memUsage) + "% Mem free");
+                return;
+            }
+        }
+        jLabelToDisplayInfo.setText("Mem usage unknown");
+    }
+
+    @Override
+    protected void done() {
+        try {
+            get();
+        } catch (InterruptedException | ExecutionException ex) {
+            logger.fatal("Update Memory Usage error", ex);
+        } catch (CancellationException ex) {}
+    }
+
+}