BUG-5280: split out cds akka client substrate

[controller.git] / opendaylight / md-sal / cds-access-client / src / main / java / org / opendaylight / controller / cluster / access / client / AbstractClientActor.java

diff --git a/opendaylight/md-sal/cds-access-client/src/main/java/org/opendaylight/controller/cluster/access/client/AbstractClientActor.java b/opendaylight/md-sal/cds-access-client/src/main/java/org/opendaylight/controller/cluster/access/client/AbstractClientActor.java
new file mode 100644 (file)
index 0000000..36f06ef
--- /dev/null
+++ b/opendaylight/md-sal/cds-access-client/src/main/java/org/opendaylight/controller/cluster/access/client/AbstractClientActor.java
@@ -0,0 +1,71 @@
+/*
+ * 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.controller.cluster.access.client;
+
+import akka.actor.ActorRef;
+import akka.actor.PoisonPill;
+import akka.persistence.UntypedPersistentActor;
+import com.google.common.annotations.Beta;
+import org.opendaylight.controller.cluster.access.concepts.FrontendIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Frontend actor which takes care of persisting generations and creates an appropriate ClientIdentifier.
+ *
+ * @author Robert Varga
+ */
+@Beta
+public abstract class AbstractClientActor extends UntypedPersistentActor {
+    private static final Logger LOG = LoggerFactory.getLogger(AbstractClientActor.class);
+    private AbstractClientActorBehavior<?> currentBehavior;
+
+    protected AbstractClientActor(final FrontendIdentifier frontendId) {
+        currentBehavior = new RecoveringClientActorBehavior(
+                new InitialClientActorContext(this, frontendId.toPersistentId()), frontendId);
+    }
+
+    @Override
+    public final String persistenceId() {
+        return currentBehavior.persistenceId();
+    }
+
+    private void switchBehavior(final AbstractClientActorBehavior<?> nextBehavior) {
+        if (!currentBehavior.equals(nextBehavior)) {
+            if (nextBehavior == null) {
+                LOG.debug("{}: shutting down", persistenceId());
+                self().tell(PoisonPill.getInstance(), ActorRef.noSender());
+            } else {
+                LOG.debug("{}: switched from {} to {}", persistenceId(), currentBehavior, nextBehavior);
+            }
+
+            currentBehavior = nextBehavior;
+        }
+    }
+
+    @Override
+    public final void onReceiveCommand(final Object command) {
+        if (command == null) {
+            LOG.debug("{}: ignoring null command", persistenceId());
+            return;
+        }
+
+        if (currentBehavior != null) {
+            switchBehavior(currentBehavior.onReceiveCommand(command));
+        } else {
+            LOG.debug("{}: shutting down, ignoring command {}", persistenceId(), command);
+        }
+    }
+
+    @Override
+    public final void onReceiveRecover(final Object recover) {
+        switchBehavior(currentBehavior.onReceiveRecover(recover));
+    }
+
+    protected abstract ClientActorBehavior initialBehavior(ClientActorContext context);
+}