Decouple config and netconf subsystems.

[controller.git] / opendaylight / config / config-persister-impl / src / main / java / org / opendaylight / controller / config / persist / impl / ConfigPersisterNotificationHandler.java

diff --git a/opendaylight/config/config-persister-impl/src/main/java/org/opendaylight/controller/config/persist/impl/ConfigPersisterNotificationHandler.java b/opendaylight/config/config-persister-impl/src/main/java/org/opendaylight/controller/config/persist/impl/ConfigPersisterNotificationHandler.java
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index 0000000..9d6ef5e
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+++ b/opendaylight/config/config-persister-impl/src/main/java/org/opendaylight/controller/config/persist/impl/ConfigPersisterNotificationHandler.java
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+
+package org.opendaylight.controller.config.persist.impl;
+
+import com.google.common.base.Optional;
+import java.io.Closeable;
+import java.io.IOException;
+import java.util.Set;
+import javax.annotation.concurrent.ThreadSafe;
+import javax.management.InstanceNotFoundException;
+import javax.management.MBeanServerConnection;
+import javax.management.Notification;
+import javax.management.NotificationListener;
+import javax.management.ObjectName;
+import org.opendaylight.controller.config.api.jmx.notifications.CommitJMXNotification;
+import org.opendaylight.controller.config.api.jmx.notifications.ConfigJMXNotification;
+import org.opendaylight.controller.config.facade.xml.ConfigSubsystemFacadeFactory;
+import org.opendaylight.controller.config.facade.xml.Datastore;
+import org.opendaylight.controller.config.persist.api.Persister;
+import org.opendaylight.controller.config.util.capability.Capability;
+import org.opendaylight.controller.config.util.xml.XmlUtil;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.w3c.dom.Element;
+
+/**
+ * Responsible for listening for notifications from netconf (via JMX) containing latest
+ * committed configuration that should be persisted, and also for loading last
+ * configuration.
+ */
+@ThreadSafe
+public class ConfigPersisterNotificationHandler implements Closeable {
+
+    private static final Logger LOG = LoggerFactory.getLogger(ConfigPersisterNotificationHandler.class);
+    private final MBeanServerConnection mBeanServerConnection;
+    private final NotificationListener listener;
+
+
+    public ConfigPersisterNotificationHandler(final MBeanServerConnection mBeanServerConnection, final Persister persisterAggregator, final ConfigSubsystemFacadeFactory facade) {
+        this(mBeanServerConnection, new ConfigPersisterNotificationListener(persisterAggregator, facade));
+    }
+
+    public ConfigPersisterNotificationHandler(final MBeanServerConnection mBeanServerConnection, final NotificationListener notificationListener) {
+        this.mBeanServerConnection = mBeanServerConnection;
+        this.listener = notificationListener;
+        registerAsJMXListener(mBeanServerConnection, listener);
+    }
+
+    private static void registerAsJMXListener(final MBeanServerConnection mBeanServerConnection, final NotificationListener listener) {
+        LOG.trace("Called registerAsJMXListener");
+        try {
+            mBeanServerConnection.addNotificationListener(ConfigJMXNotification.OBJECT_NAME, listener, null, null);
+        } catch (InstanceNotFoundException | IOException e) {
+            throw new IllegalStateException("Cannot register as JMX listener to netconf", e);
+        }
+    }
+
+    @Override
+    public synchronized void close() {
+        // unregister from JMX
+        final ObjectName on = ConfigJMXNotification.OBJECT_NAME;
+        try {
+            if (mBeanServerConnection.isRegistered(on)) {
+                mBeanServerConnection.removeNotificationListener(on, listener);
+            }
+        } catch (final Exception e) {
+            LOG.warn("Unable to unregister {} as listener for {}", listener, on, e);
+        }
+    }
+}
+
+class ConfigPersisterNotificationListener implements NotificationListener {
+    private static final Logger LOG = LoggerFactory.getLogger(ConfigPersisterNotificationListener.class);
+
+    private final Persister persisterAggregator;
+    private final ConfigSubsystemFacadeFactory facade;
+
+    ConfigPersisterNotificationListener(final Persister persisterAggregator, final ConfigSubsystemFacadeFactory facade) {
+        this.persisterAggregator = persisterAggregator;
+        this.facade = facade;
+    }
+
+    @Override
+    public void handleNotification(final Notification notification, final Object handback) {
+        if (!(notification instanceof ConfigJMXNotification)) {
+            return;
+        }
+
+        // Socket should not be closed at this point
+        // Activator unregisters this as JMX listener before close is called
+
+        LOG.trace("Received notification {}", notification);
+        if (notification instanceof CommitJMXNotification) {
+            try {
+                handleAfterCommitNotification();
+            } catch (final Exception e) {
+                // log exceptions from notification Handler here since
+                // notificationBroadcastSupport logs only DEBUG level
+                LOG.warn("Failed to handle notification {}", notification, e);
+                throw e;
+            }
+        } else {
+            throw new IllegalStateException("Unknown config registry notification type " + notification);
+        }
+    }
+
+    private void handleAfterCommitNotification() {
+        try {
+            final Set<Capability> currentCapabilities = facade.getCurrentCapabilities();
+            final Element configSnapshot = facade.createFacade("config-persister").getConfiguration(XmlUtil.newDocument(), Datastore.running, Optional.<String>absent());
+            persisterAggregator.persistConfig(new CapabilityStrippingConfigSnapshotHolder(configSnapshot,
+                    ConfigPusherImpl.transformCapabilities(currentCapabilities)));
+            LOG.trace("Configuration persisted successfully");
+        } catch (final IOException e) {
+            throw new RuntimeException("Unable to persist configuration snapshot", e);
+        }
+    }
+}