| /* |
| * Copyright 2017-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.store.primitives.resources.impl; |
| |
| import java.util.Collection; |
| import java.util.Set; |
| import java.util.function.Consumer; |
| import java.util.function.Function; |
| |
| import com.google.common.collect.ImmutableSet; |
| import com.google.common.collect.Sets; |
| import io.atomix.protocols.raft.proxy.RaftProxy; |
| import org.onosproject.store.service.DistributedPrimitive; |
| |
| import static com.google.common.base.MoreObjects.toStringHelper; |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| /** |
| * Abstract base class for primitives that interact with Raft replicated state machines via proxy. |
| */ |
| public abstract class AbstractRaftPrimitive implements DistributedPrimitive { |
| private final Function<RaftProxy.State, Status> mapper = state -> { |
| switch (state) { |
| case CONNECTED: |
| return Status.ACTIVE; |
| case SUSPENDED: |
| return Status.SUSPENDED; |
| case CLOSED: |
| return Status.INACTIVE; |
| default: |
| throw new IllegalStateException("Unknown state " + state); |
| } |
| }; |
| |
| protected final RaftProxy proxy; |
| private final Set<Consumer<Status>> statusChangeListeners = Sets.newCopyOnWriteArraySet(); |
| |
| public AbstractRaftPrimitive(RaftProxy proxy) { |
| this.proxy = checkNotNull(proxy, "proxy cannot be null"); |
| proxy.addStateChangeListener(this::onStateChange); |
| } |
| |
| @Override |
| public String name() { |
| return proxy.name(); |
| } |
| |
| /** |
| * Handles a Raft session state change. |
| * |
| * @param state the updated Raft session state |
| */ |
| private void onStateChange(RaftProxy.State state) { |
| statusChangeListeners.forEach(listener -> listener.accept(mapper.apply(state))); |
| } |
| |
| @Override |
| public void addStatusChangeListener(Consumer<Status> listener) { |
| statusChangeListeners.add(listener); |
| } |
| |
| @Override |
| public void removeStatusChangeListener(Consumer<Status> listener) { |
| statusChangeListeners.remove(listener); |
| } |
| |
| @Override |
| public Collection<Consumer<Status>> statusChangeListeners() { |
| return ImmutableSet.copyOf(statusChangeListeners); |
| } |
| |
| @Override |
| public String toString() { |
| return toStringHelper(this) |
| .add("proxy", proxy) |
| .toString(); |
| } |
| } |