| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.brooklyn.policy.action; |
| |
| import java.util.List; |
| |
| import org.apache.brooklyn.api.effector.Effector; |
| import org.apache.brooklyn.api.policy.Policy; |
| import org.apache.brooklyn.config.ConfigKey; |
| import org.apache.brooklyn.core.config.ConfigKeys; |
| import org.apache.brooklyn.util.time.Duration; |
| import org.apache.brooklyn.util.time.DurationPredicates; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.google.common.annotations.Beta; |
| import com.google.common.base.Preconditions; |
| |
| /** |
| * A {@link Policy} that executes an {@link Effector} at specific intervals. |
| * <p> |
| * The following example shows a pair of policies that resize a cluster |
| * from one to ten entities during the day and back to one at night,: |
| * <pre>{@code |
| * brooklyn.policies: |
| * - type: org.apache.brooklyn.policy.action.PeriodicEffectorPolicy |
| * brooklyn.config: |
| * effector: resize |
| * args: |
| * desiredSize: 10 |
| * period: 1 day |
| * time: 08:00:00 |
| * - type: org.apache.brooklyn.policy.action.PeriodicEffectorPolicy |
| * brooklyn.config: |
| * effector: resize |
| * args: |
| * desiredSize: 1 |
| * period: 1 day |
| * time: 18:00:00 |
| * }</pre> |
| */ |
| @Beta |
| public class PeriodicEffectorPolicy extends AbstractScheduledEffectorPolicy { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(PeriodicEffectorPolicy.class); |
| |
| public static final ConfigKey<Duration> PERIOD = ConfigKeys.builder(Duration.class) |
| .name("period") |
| .description("The duration between executions of this policy") |
| .constraint(DurationPredicates.positive()) |
| .defaultValue(Duration.hours(1)) |
| .build(); |
| |
| public PeriodicEffectorPolicy() { |
| super(); |
| } |
| |
| @Override |
| public void start() { |
| Duration period = Preconditions.checkNotNull(config().get(PERIOD), "The period must be configured for this policy"); |
| String time = config().get(TIME); |
| Duration wait = config().get(WAIT); |
| if (time != null) { |
| wait = getWaitUntil(time); |
| } else if (wait == null) { |
| wait = period; |
| } |
| |
| schedule(wait); |
| } |
| |
| @Override |
| protected List<Long> resubmitOnResume() { |
| List<Long> scheduled = super.resubmitOnResume(); |
| |
| if (scheduled.isEmpty()) { |
| // We missed an entire period; re-calculate (rather than relying on run's finally block) |
| start(); |
| } |
| return scheduled; |
| } |
| |
| @Override |
| public synchronized void run() { |
| try { |
| super.run(); |
| } finally { |
| if (isRunning() && getManagementContext().isRunning()) { |
| Duration period = config().get(PERIOD); |
| String time = config().get(TIME); |
| if (time == null || time.equalsIgnoreCase(NOW) || time.equalsIgnoreCase(IMMEDIATELY)) { |
| schedule(period); |
| } else { |
| Duration wait = getWaitUntil(time); |
| schedule(wait.upperBound(period)); |
| } |
| } |
| } |
| } |
| } |