RAM size adaption works.

org.jdrupes.vmoperator.runner.qemu/src/org/jdrupes/vmoperator/runner/qemu/Configuration.java

@@ -19,6 +19,7 @@
 package org.jdrupes.vmoperator.runner.qemu;
 
 import java.io.IOException;
+import java.math.BigDecimal;
 import java.math.BigInteger;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
@@ -35,7 +36,6 @@ import java.util.regex.Pattern;
 import org.jdrupes.vmoperator.util.Dto;
 import org.jdrupes.vmoperator.util.FsdUtils;
 
-// TODO: Auto-generated Javadoc
 /**
  * The configuration information from the configuration file.
  */
@@ -50,7 +50,7 @@ class Configuration implements Dto {
     @SuppressWarnings({ "PMD.FieldNamingConventions",
         "PMD.VariableNamingConventions" })
     private static final Pattern memorySize
-        = Pattern.compile("\\s*(\\d+)\\s*([^\\s]*)");
+        = Pattern.compile("^\\s*(\\d+(\\.\\d+)?)\\s*([A-Za-z]*)\\s*");
 
     static {
         // SI units and common abbreviations
@@ -105,6 +105,7 @@ class Configuration implements Dto {
      * @param amount the amount
      * @return the big integer
      */
+    @SuppressWarnings("PMD.DataflowAnomalyAnalysis")
     public static BigInteger parseMemory(Object amount) {
         if (amount == null) {
             return (BigInteger) amount;
@@ -119,12 +120,16 @@ class Configuration implements Dto {
         if (!matcher.matches()) {
             throw new NumberFormatException(amount.toString());
         }
-        var unit = unitMap.get(matcher.group(2));
+        var unit = BigInteger.ONE;
-        if (unit == null) {
+        if (matcher.group(3) != null) {
-            throw new NumberFormatException(amount.toString());
+            unit = unitMap.get(matcher.group(3));
+            if (unit == null) {
+                throw new NumberFormatException(amount.toString());
+            }
         }
         var number = matcher.group(1);
-        return new BigInteger(number).multiply(unit);
+        return new BigDecimal(number).multiply(new BigDecimal(unit))
+            .toBigInteger();
     }
 
     /**

org.jdrupes.vmoperator.runner.qemu/src/org/jdrupes/vmoperator/runner/qemu/QemuMonitor.java

@@ -220,7 +220,7 @@ public class QemuMonitor extends Component {
             var response
                 = ((Runner) channel()).mapper().readValue(line, JsonNode.class);
             if (response.has("QMP")) {
-                fire(new QemuMonitorOpened());
+                fire(new QemuMonitorAvailable());
             }
         } catch (JsonProcessingException e) {
             throw new IOException(e);

org.jdrupes.vmoperator.runner.qemu/src/org/jdrupes/vmoperator/runner/qemu/QemuMonitorAvailable.java

@@ -18,12 +18,12 @@
 
 package org.jdrupes.vmoperator.runner.qemu;
 
-import org.jgrapes.io.events.Opened;
+import org.jgrapes.core.Event;
 
 /**
  * Signals that the connection to the Qemu monitor socket has been
  * established successfully.
  */
-public class QemuMonitorOpened extends Opened<Void> {
+public class QemuMonitorAvailable extends Event<Void> {
 
 }

org.jdrupes.vmoperator.runner.qemu/src/org/jdrupes/vmoperator/runner/qemu/Runner.java

@@ -226,7 +226,9 @@ public class Runner extends Component {
         event.structured(componentPath()).ifPresent(c -> {
             if (event instanceof InitialConfiguration) {
                 processInitialConfiguration(c);
+                return;
             }
+            updateConfiguration(c);
         });
     }
 
@@ -323,6 +325,24 @@ public class Runner extends Component {
         return mapper.readValue(out.toString(), JsonNode.class);
     }
 
+    @SuppressWarnings("unchecked")
+    private void updateConfiguration(Map<String, Object> conf) {
+        Optional.ofNullable((Map<String, Object>) conf.get("vm"))
+            .map(vm -> vm.get("currentRam")).map(Configuration::parseMemory)
+            .ifPresent(cr -> {
+                if (config.vm.currentRam != null
+                    && config.vm.currentRam.equals(cr)) {
+                    return;
+                }
+                synchronized (state) {
+                    config.vm.currentRam = cr;
+                    if (state.get() == State.RUNNING) {
+                        qemuMonitor.setCurrentRam(cr);
+                    }
+                }
+            });
+    }
+
     /**
      * Handle the start event.
      *
@@ -456,10 +476,12 @@ public class Runner extends Component {
      * @param event the event
      */
     @Handler
-    public void onQemuMonitorOpened(QemuMonitorOpened event) {
+    public void onQemuMonitorAvailable(QemuMonitorAvailable event) {
-        Optional.ofNullable(config.vm.currentRam)
+        synchronized (state) {
-            .ifPresent(qemuMonitor::setCurrentRam);
+            Optional.ofNullable(config.vm.currentRam)
-        state.set(State.RUNNING);
+                .ifPresent(qemuMonitor::setCurrentRam);
+            state.set(State.RUNNING);
+        }
     }
 
     /**