Split Restconf implementations (draft02 and RFC) - Prepare modules

[netconf.git] / restconf / restconf-nb-bierman02 / src / main / java / org / opendaylight / netconf / sal / streams / listeners / EventBusChangeRecorder.java

diff --git a/restconf/restconf-nb-bierman02/src/main/java/org/opendaylight/netconf/sal/streams/listeners/EventBusChangeRecorder.java b/restconf/restconf-nb-bierman02/src/main/java/org/opendaylight/netconf/sal/streams/listeners/EventBusChangeRecorder.java
new file mode 100644 (file)
index 0000000..11e5656
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+++ b/restconf/restconf-nb-bierman02/src/main/java/org/opendaylight/netconf/sal/streams/listeners/EventBusChangeRecorder.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2016 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.netconf.sal.streams.listeners;
+
+import com.google.common.eventbus.Subscribe;
+import io.netty.channel.Channel;
+import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+class EventBusChangeRecorder<T extends BaseListenerInterface> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(EventBusChangeRecorder.class);
+    private final T listener;
+
+    /**
+     * Event bus change recorder of specific listener of notifications.
+     *
+     * @param listener
+     *             specific listener
+     */
+    EventBusChangeRecorder(final T listener) {
+        this.listener = listener;
+    }
+
+    @Subscribe
+    public void recordCustomerChange(final Event event) {
+        if (event.getType() == EventType.REGISTER) {
+            final Channel subscriber = event.getSubscriber();
+            if (!this.listener.getSubscribers().contains(subscriber)) {
+                this.listener.getSubscribers().add(subscriber);
+            }
+        } else if (event.getType() == EventType.DEREGISTER) {
+            this.listener.getSubscribers().remove(event.getSubscriber());
+            Notificator.removeListenerIfNoSubscriberExists(this.listener);
+        } else if (event.getType() == EventType.NOTIFY) {
+            for (final Channel subscriber : this.listener.getSubscribers()) {
+                if (subscriber.isActive()) {
+                    LOG.debug("Data are sent to subscriber {}:", subscriber.remoteAddress());
+                    subscriber.writeAndFlush(new TextWebSocketFrame(event.getData()));
+                } else {
+                    LOG.debug("Subscriber {} is removed - channel is not active yet.", subscriber.remoteAddress());
+                    this.listener.getSubscribers().remove(subscriber);
+                }
+            }
+        }
+    }
+}