Expose disk-scan-period, max-disk-usage, and global-max-size in server control

artemis-core-client/src/main/java/org/apache/activemq/artemis/api/core/management/ActiveMQServerControl.java

@@ -403,6 +403,24 @@ public interface ActiveMQServerControl {
    @Attribute(desc = "whether the initial replication synchronization process with the backup server is complete")
    boolean isReplicaSync();
 
+   /**
+    * Returns how often the server checks for disk space usage.
+    */
+   @Attribute(desc = "how often to check for disk space usage, in milliseconds")
+   int getDiskScanPeriod();
+
+   /**
+    * Returns the disk use max limit.
+    */
+   @Attribute(desc = "maximum limit for disk use, in percentage")
+   int getMaxDiskUsage();
+
+   /**
+    * Returns the global max bytes limit for in-memory messages.
+    */
+   @Attribute(desc = "global maximum limit for in-memory messages, in bytes")
+   long getGlobalMaxSize();
+
    // Operations ----------------------------------------------------
 
    /**

artemis-server/src/main/java/org/apache/activemq/artemis/core/management/impl/ActiveMQServerControlImpl.java

@@ -545,6 +545,45 @@ public class ActiveMQServerControlImpl extends AbstractControl implements Active
       }
    }
 
+   @Override
+   public int getDiskScanPeriod() {
+      checkStarted();
+
+      clearIO();
+      try {
+         return configuration.getDiskScanPeriod();
+      }
+      finally {
+         blockOnIO();
+      }
+   }
+
+   @Override
+   public int getMaxDiskUsage() {
+      checkStarted();
+
+      clearIO();
+      try {
+         return configuration.getMaxDiskUsage();
+      }
+      finally {
+         blockOnIO();
+      }
+   }
+
+   @Override
+   public long getGlobalMaxSize() {
+      checkStarted();
+
+      clearIO();
+      try {
+         return configuration.getGlobalMaxSize();
+      }
+      finally {
+         blockOnIO();
+      }
+   }
+
    @Override
    public void deployQueue(final String address, final String name, final String filterString) throws Exception {
       checkStarted();

tests/integration-tests/src/test/java/org/apache/activemq/artemis/tests/integration/management/ActiveMQServerControlUsingCoreTest.java

@@ -509,6 +509,21 @@ public class ActiveMQServerControlUsingCoreTest extends ActiveMQServerControlTes
             return (Boolean) proxy.retrieveAttributeValue("PersistenceEnabled");
          }
 
+         @Override
+         public int getDiskScanPeriod() {
+            return (Integer) proxy.retrieveAttributeValue("DiskScanPeriod", Integer.class);
+         }
+
+         @Override
+         public int getMaxDiskUsage() {
+            return (Integer) proxy.retrieveAttributeValue("MaxDiskUsage", Integer.class);
+         }
+
+         @Override
+         public long getGlobalMaxSize() {
+            return (Long) proxy.retrieveAttributeValue("GlobalMaxSize", Long.class);
+         }
+
          @Override
          public void addSecuritySettings(String addressMatch,
                                          String sendRoles,