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java/org/apache/tomcat/util/modeler/NotificationInfo.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.util.modeler;
+
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReadWriteLock;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+
+import javax.management.MBeanNotificationInfo;
+
+/**
+ * <p>Internal configuration information for a <code>Notification</code>
+ * descriptor.</p>
+ *
+ * @author Craig R. McClanahan
+ */
+public class NotificationInfo extends FeatureInfo {
+
+    static final long serialVersionUID = -6319885418912650856L;
+
+    // ----------------------------------------------------- Instance Variables
+
+
+    /**
+     * The <code>ModelMBeanNotificationInfo</code> object that corresponds
+     * to this <code>NotificationInfo</code> instance.
+     */
+    transient MBeanNotificationInfo info = null;
+    protected String notifTypes[] = new String[0];
+    protected final ReadWriteLock notifTypesLock = new ReentrantReadWriteLock();
+
+    // ------------------------------------------------------------- Properties
+
+
+    /**
+     * Override the <code>description</code> property setter.
+     *
+     * @param description The new description
+     */
+    @Override
+    public void setDescription(String description) {
+        super.setDescription(description);
+        this.info = null;
+    }
+
+
+    /**
+     * Override the <code>name</code> property setter.
+     *
+     * @param name The new name
+     */
+    @Override
+    public void setName(String name) {
+        super.setName(name);
+        this.info = null;
+    }
+
+
+    /**
+     * @return the set of notification types for this MBean.
+     */
+    public String[] getNotifTypes() {
+        Lock readLock = notifTypesLock.readLock();
+        readLock.lock();
+        try {
+            return this.notifTypes;
+        } finally {
+            readLock.unlock();
+        }
+    }
+
+
+    // --------------------------------------------------------- Public Methods
+
+
+    /**
+     * Add a new notification type to the set managed by an MBean.
+     *
+     * @param notifType The new notification type
+     */
+    public void addNotifType(String notifType) {
+
+        Lock writeLock = notifTypesLock.writeLock();
+        writeLock.lock();
+        try {
+
+            String results[] = new String[notifTypes.length + 1];
+            System.arraycopy(notifTypes, 0, results, 0, notifTypes.length);
+            results[notifTypes.length] = notifType;
+            notifTypes = results;
+            this.info = null;
+        } finally {
+            writeLock.unlock();
+        }
+    }
+
+
+    /**
+     * Create and return a <code>ModelMBeanNotificationInfo</code> object that
+     * corresponds to the attribute described by this instance.
+     * @return the notification info
+     */
+    public MBeanNotificationInfo createNotificationInfo() {
+
+        // Return our cached information (if any)
+        if (info != null)
+            return info;
+
+        // Create and return a new information object
+        info = new MBeanNotificationInfo
+            (getNotifTypes(), getName(), getDescription());
+        //Descriptor descriptor = info.getDescriptor();
+        //addFields(descriptor);
+        //info.setDescriptor(descriptor);
+        return info;
+
+    }
+
+
+    /**
+     * Return a string representation of this notification descriptor.
+     */
+    @Override
+    public String toString() {
+
+        StringBuilder sb = new StringBuilder("NotificationInfo[");
+        sb.append("name=");
+        sb.append(name);
+        sb.append(", description=");
+        sb.append(description);
+        sb.append(", notifTypes=");
+        Lock readLock = notifTypesLock.readLock();
+        readLock.lock();
+        try {
+            sb.append(notifTypes.length);
+        } finally {
+            readLock.unlock();
+        }
+        sb.append("]");
+        return sb.toString();
+    }
+}