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java/org/apache/tomcat/dbcp/dbcp2/ObjectNameWrapper.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.tomcat.dbcp.dbcp2;
+
+import java.lang.management.ManagementFactory;
+import java.util.Objects;
+
+import javax.management.MBeanServer;
+import javax.management.MalformedObjectNameException;
+import javax.management.ObjectName;
+
+import org.apache.juli.logging.Log;
+import org.apache.juli.logging.LogFactory;
+
+/**
+ * Internal wrapper class that allows JMX to be a noop if absent or disabled.
+ *
+ * @since 2.2.1
+ */
+class ObjectNameWrapper {
+
+    private static final Log log = LogFactory.getLog(ObjectNameWrapper.class);
+
+    private static MBeanServer MBEAN_SERVER = getPlatformMBeanServer();
+
+    private static MBeanServer getPlatformMBeanServer() {
+        try {
+            return ManagementFactory.getPlatformMBeanServer();
+        } catch (LinkageError | Exception e) {
+            // ignore - JMX not available
+            log.debug("Failed to get platform MBeanServer", e);
+            return null;
+        }
+    }
+
+    public static ObjectName unwrap(final ObjectNameWrapper wrapper) {
+        return wrapper == null ? null : wrapper.unwrap();
+    }
+
+    public static ObjectNameWrapper wrap(final ObjectName objectName) {
+        return new ObjectNameWrapper(objectName);
+    }
+
+    public static ObjectNameWrapper wrap(final String name) throws MalformedObjectNameException {
+        return wrap(new ObjectName(name));
+    }
+
+    private final ObjectName objectName;
+
+    public ObjectNameWrapper(final ObjectName objectName) {
+        this.objectName = objectName;
+    }
+
+    public void registerMBean(final Object object) {
+        if (MBEAN_SERVER == null || objectName == null) {
+            return;
+        }
+        try {
+            MBEAN_SERVER.registerMBean(object, objectName);
+        } catch (LinkageError | Exception e) {
+            log.warn("Failed to complete JMX registration for " + objectName, e);
+        }
+    }
+
+    /**
+     * @since 2.7.0
+     */
+    @Override
+    public String toString() {
+        return Objects.toString(objectName);
+    }
+
+    public void unregisterMBean() {
+        if (MBEAN_SERVER == null || objectName == null) {
+            return;
+        }
+        if (MBEAN_SERVER.isRegistered(objectName)) {
+            try {
+                MBEAN_SERVER.unregisterMBean(objectName);
+            } catch (LinkageError | Exception e) {
+                log.warn("Failed to complete JMX unregistration for " + objectName, e);
+            }
+        }
+    }
+
+    public ObjectName unwrap() {
+        return objectName;
+    }
+
+}