| /** |
| * 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.apache.aurora.scheduler.state; |
| |
| import com.google.common.collect.HashMultimap; |
| import com.google.common.collect.ImmutableSetMultimap; |
| import com.google.common.collect.Multimap; |
| import com.google.common.eventbus.Subscribe; |
| |
| import org.apache.aurora.scheduler.base.Tasks; |
| import org.apache.aurora.scheduler.events.PubsubEvent; |
| import org.apache.aurora.scheduler.events.PubsubEvent.TaskStateChange; |
| import org.apache.aurora.scheduler.preemptor.PreemptionVictim; |
| |
| /** |
| * A cached view of cluster state, kept up to date by pubsub notifications. |
| */ |
| public class ClusterStateImpl implements ClusterState, PubsubEvent.EventSubscriber { |
| |
| private final Multimap<String, PreemptionVictim> victims = HashMultimap.create(); |
| |
| @Override |
| public Multimap<String, PreemptionVictim> getSlavesToActiveTasks() { |
| synchronized (victims) { |
| return ImmutableSetMultimap.copyOf(victims); |
| } |
| } |
| |
| @Subscribe |
| public void taskChangedState(TaskStateChange stateChange) { |
| synchronized (victims) { |
| String slaveId = stateChange.getTask().getAssignedTask().getSlaveId(); |
| PreemptionVictim victim = PreemptionVictim.fromTask(stateChange.getTask().getAssignedTask()); |
| if (Tasks.SLAVE_ASSIGNED_STATES.contains(stateChange.getNewState())) { |
| victims.put(slaveId, victim); |
| } else { |
| victims.remove(slaveId, victim); |
| } |
| } |
| } |
| } |