/*
* Copyright (c) 2014 Spotify AB.
*
* 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 com.spotify.helios.agent;
import org.joda.time.Instant;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.when;
@RunWith(MockitoJUnitRunner.class)
public class FlapControllerTest {
@Mock private Clock clock;
@Test
public void testRecoveryFromFlappingWhileRunning() throws Exception {
final FlapController controller = FlapController.newBuilder()
.setClock(clock)
.setRestartCount(2)
.setTimeRangeMillis(1000)
.build();
assertFalse(controller.isFlapping());
when(clock.now()).thenReturn(new Instant(0));
// get controller into flapping state
controller.started();
controller.exited();
assertFalse(controller.isFlapping()); // not failed enough *yet*
controller.started();
controller.exited();
assertTrue(controller.isFlapping()); // now we failed enough.
//// See that the state maintains the flapping state.
controller.started();
controller.exited();
assertTrue(controller.isFlapping());
controller.started();
controller.exited();
assertTrue(controller.isFlapping());
//// Now test that the state will update while the future is running
controller.started();
when(clock.now()).thenReturn(new Instant(2000));
assertFalse(controller.isFlapping());
}
@Test
public void testEnterAndExitFlapping() throws Exception {
FlapController controller = FlapController.newBuilder()
.setClock(clock)
.setRestartCount(2)
.setTimeRangeMillis(1000)
.build();
assertFalse(controller.isFlapping());
when(clock.now()).thenReturn(new Instant(0));
controller.started();
when(clock.now()).thenReturn(new Instant(1));
controller.exited(); // 1 second of runtime T=1
assertFalse(controller.isFlapping());
controller.started();
when(clock.now()).thenReturn(new Instant(2));
controller.exited(); // total of 2ms of runtime T=2
assertTrue(controller.isFlapping()); // next time job would start would be at t=7 seconds
controller.started();
when(clock.now()).thenReturn(new Instant(8));
controller.exited(); // total of 3ms of runtime T=8 (5 of that is throttle)
assertTrue(controller.isFlapping()); // next time job would start would be at t=13
controller.started();
when(clock.now()).thenReturn(new Instant(1034));
controller.exited(); // ran 1021ms additionally here, so should disengage flapping T=1034
assertFalse(controller.isFlapping());
}
}