Initial implementation of GossipIntentStore.

Create/update operations are implemented and working in 2-node cluster.
No remove operations yet.

Change-Id: Ief68c9d5c3bb483823b6f92d29fa83df0ab7b58f

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.intent;
+
+import org.onosproject.store.Timestamp;
+
+/**
+ * Logical clock service that issues per-intent timestamps.
+ */
+public interface IntentClockService {
+
+    /**
+     * Returns a new timestamp for the specified intent.
+     *
+     * @param intentId identifier for the intent.
+     * @return timestamp
+     */
+    public Timestamp getTimestamp(IntentId intentId);
+}

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.store.intent.impl;
+
+import org.onosproject.store.cluster.messaging.MessageSubject;
+
+/**
+ * Message subjects for internal gossip intent store node-to-node messages.
+ */
+public final class GossipIntentStoreMessageSubjects {
+    private GossipIntentStoreMessageSubjects() {}
+
+    public static final MessageSubject INTENT_UPDATED_MSG
+            = new MessageSubject("peer-intent-updated");
+    public static final MessageSubject INTENT_SET_INSTALLABLES_MSG
+            = new MessageSubject("peer-intent-set-installables");
+    public static final MessageSubject INTENT_ANTI_ENTROPY_ADVERTISEMENT
+            = new MessageSubject("intent-anti-entropy-advertisement");
+}

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.store.intent.impl;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Service;
+import org.onosproject.net.intent.IntentClockService;
+import org.onosproject.net.intent.IntentId;
+import org.onosproject.store.Timestamp;
+import org.onosproject.store.impl.WallClockTimestamp;
+import org.slf4j.Logger;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * IntentClockService that issues timestamps based on local wallclock time.
+ */
+@Component(immediate = true)
+@Service
+public class IntentClockManager implements IntentClockService {
+
+    private final Logger log = getLogger(getClass());
+
+    @Activate
+    public void activate() {
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        log.info("Stopped");
+    }
+
+    @Override
+    public Timestamp getTimestamp(IntentId intentId) {
+        return new WallClockTimestamp();
+    }
+}

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.store.intent.impl;
+
+import org.onosproject.net.intent.Intent;
+import org.onosproject.net.intent.IntentId;
+import org.onosproject.net.intent.IntentState;
+import org.onosproject.store.Timestamp;
+
+/**
+ * Information published by GossipIntentStore to notify peers of an intent
+ * creation or state update event.
+ */
+public class InternalIntentEvent {
+
+    private final IntentId intentId;
+    private final Intent intent;
+    private final IntentState state;
+    private final Timestamp timestamp;
+
+    public InternalIntentEvent(IntentId intentId, Intent intent, IntentState state,
+                               Timestamp timestamp) {
+        this.intentId = intentId;
+        this.intent = intent;
+        this.state = state;
+        this.timestamp = timestamp;
+    }
+
+    public IntentId intentId() {
+        return intentId;
+    }
+
+    public Intent intent() {
+        return intent;
+    }
+
+    public IntentState state() {
+        return state;
+    }
+
+    public Timestamp timestamp() {
+        return timestamp;
+    }
+
+    // Needed for serialization.
+    @SuppressWarnings("unused")
+    private InternalIntentEvent() {
+        intentId = null;
+        intent = null;
+        state = null;
+        timestamp = null;
+    }
+}

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.store.intent.impl;
+
+import org.onosproject.net.intent.Intent;
+import org.onosproject.net.intent.IntentId;
+import org.onosproject.store.Timestamp;
+
+import java.util.List;
+
+/**
+ * Information published by GossipIntentStore to notify peers of an intent
+ * set installables event.
+ */
+public class InternalSetInstallablesEvent {
+
+    private final IntentId intentId;
+    private final List<Intent> installables;
+    private final Timestamp timestamp;
+
+    public InternalSetInstallablesEvent(IntentId intentId,
+                                        List<Intent> installables,
+                                        Timestamp timestamp) {
+        this.intentId = intentId;
+        this.installables = installables;
+        this.timestamp = timestamp;
+    }
+
+    public IntentId intentId() {
+        return intentId;
+    }
+
+    public List<Intent> installables() {
+        return installables;
+    }
+
+    public Timestamp timestamp() {
+        return timestamp;
+    }
+
+    // Needed for serialization.
+    @SuppressWarnings("unused")
+    private InternalSetInstallablesEvent() {
+        intentId = null;
+        installables = null;
+        timestamp = null;
+    }
+}