ARTEMIS-3196 - expose journal pool files in JMX

https://issues.apache.org/jira/browse/ARTEMIS-3196

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

@@ -183,6 +183,12 @@ public interface ActiveMQServerControl {
    @Attribute(desc = "Size of the internal buffer on the journal")
    int getJournalBufferSize();
 
+   /**
+    * Number of files that would be acceptable to keep on a pool
+    */
+   @Attribute(desc = "Number of files that would be acceptable to keep on a pool")
+   int getJournalPoolFiles();
+
    /**
     * Returns the timeout (in nanoseconds) used to flush internal buffers on the journal.
     */

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

@@ -311,6 +311,21 @@ public class ActiveMQServerControlImpl extends AbstractControl implements Active
       }
    }
 
+   @Override
+   public int getJournalPoolFiles() {
+      if (AuditLogger.isEnabled()) {
+         AuditLogger.getJournalBufferSize(this.server);
+      }
+      checkStarted();
+
+      clearIO();
+      try {
+         return configuration.getJournalPoolFiles();
+      } finally {
+         blockOnIO();
+      }
+   }
+
    @Override
    public int getJournalBufferSize() {
       if (AuditLogger.isEnabled()) {

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

@@ -197,6 +197,7 @@ public class ActiveMQServerControlTest extends ManagementTestBase {
       Assert.assertEquals(conf.getJournalCompactMinFiles(), serverControl.getJournalCompactMinFiles());
       Assert.assertEquals(conf.getJournalCompactPercentage(), serverControl.getJournalCompactPercentage());
       Assert.assertEquals(conf.isPersistenceEnabled(), serverControl.isPersistenceEnabled());
+      Assert.assertEquals(conf.getJournalPoolFiles(), serverControl.getJournalPoolFiles());
       Assert.assertTrue(serverControl.isActive());
    }
 

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

@@ -747,6 +747,11 @@ public class ActiveMQServerControlUsingCoreTest extends ActiveMQServerControlTes
             return (Integer) proxy.retrieveAttributeValue("JournalBufferSize", Integer.class);
          }
 
+         @Override
+         public int getJournalPoolFiles() {
+            return (Integer) proxy.retrieveAttributeValue("getJournalPoolFiles", Integer.class);
+         }
+
          @Override
          public int getJournalBufferTimeout() {
             return (Integer) proxy.retrieveAttributeValue("JournalBufferTimeout", Integer.class);