Improve scalability of P4Runtime subsystem
The P4Runtime client was hanging (deadlock) on a master arbitration
request. As such, all other requests (e.g. table write) were waiting
for the client's request lock to become available.
Apart from fixing those deadlocks, this patch brings a number of
improvements that all together allow to run networks of 100+ P4Runtime
devices on a single ONOS instance (before only ~20 devices)
Includes:
- Asynchrounous mastership handling in DevicHandshaker (as defined in
the P4Runtime and OpenFlow spec)
- Refactored arbitration handling in the P4RuntimeClient
to be consistent with the P4Runtime spec
- Report suspect deadlocks in P4RuntimeClientImpl
- Exploit write errors in P4RuntimeClient to quickly report
channel/mastership errors to upper layers
- Complete all futures with deadlines in P4Runtime driver
- Dump all tables in one request
- Re-purposed ChannelEvent to DeviceAgentEvent to carry also mastership
response events
- Fixed IntelliJ warnings
- Various code and log clean-ups
Change-Id: I9376793a9fe69d8eddf7e8ac2ef0ee4c14fbd198
diff --git a/core/api/src/main/java/org/onosproject/net/device/DeviceAgentListener.java b/core/api/src/main/java/org/onosproject/net/device/DeviceAgentListener.java
new file mode 100644
index 0000000..c034dc2
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/device/DeviceAgentListener.java
@@ -0,0 +1,25 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed 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.onosproject.net.device;
+
+import org.onosproject.event.EventListener;
+
+/**
+ * A listener to receive events related to a protocol agent controlling an
+ * infrastructure device.
+ */
+public interface DeviceAgentListener extends EventListener<DeviceAgentEvent> {
+}