| /* |
| * Copyright 2017, gRPC Authors All rights reserved. |
| * |
| * 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 io.grpc.internal; |
| |
| import static org.junit.Assert.assertEquals; |
| |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| |
| /** Unit tests for {@link AtomicBackoff}. */ |
| @RunWith(JUnit4.class) |
| public class AtomicBackoffTest { |
| @Test(expected = IllegalArgumentException.class) |
| public void mustBePositive() { |
| new AtomicBackoff("test", 0); |
| } |
| |
| @Test |
| public void backoff_doesNotChangeStateGet() { |
| AtomicBackoff backoff = new AtomicBackoff("test", 8); |
| AtomicBackoff.State state = backoff.getState(); |
| assertEquals(8, state.get()); |
| state.backoff(); |
| assertEquals(8, state.get()); |
| } |
| |
| @Test |
| public void backoff_doubles() { |
| AtomicBackoff backoff = new AtomicBackoff("test", 3); |
| backoff.getState().backoff(); |
| assertEquals(6, backoff.getState().get()); |
| |
| backoff.getState().backoff(); |
| assertEquals(12, backoff.getState().get()); |
| |
| backoff.getState().backoff(); |
| assertEquals(24, backoff.getState().get()); |
| |
| backoff = new AtomicBackoff("test", 13); |
| backoff.getState().backoff(); |
| assertEquals(26, backoff.getState().get()); |
| } |
| |
| @Test |
| public void backoff_oncePerState() { |
| AtomicBackoff backoff = new AtomicBackoff("test", 8); |
| AtomicBackoff.State state = backoff.getState(); |
| |
| state.backoff(); |
| assertEquals(8, state.get()); |
| assertEquals(16, backoff.getState().get()); |
| state.backoff(); // Nothing happens the second time |
| assertEquals(8, state.get()); |
| assertEquals(16, backoff.getState().get()); |
| } |
| |
| @Test |
| public void backoff_twiceForEquivalentState_noChange() { |
| AtomicBackoff backoff = new AtomicBackoff("test", 8); |
| AtomicBackoff.State state1 = backoff.getState(); |
| AtomicBackoff.State state2 = backoff.getState(); |
| state1.backoff(); |
| state2.backoff(); |
| assertEquals(16, backoff.getState().get()); |
| } |
| |
| @Test |
| public void backoff_delayed() { |
| AtomicBackoff backoff = new AtomicBackoff("test", 8); |
| AtomicBackoff.State state = backoff.getState(); |
| backoff.getState().backoff(); |
| backoff.getState().backoff(); |
| assertEquals(32, backoff.getState().get()); |
| |
| // Shouldn't decrease value |
| state.backoff(); |
| assertEquals(32, backoff.getState().get()); |
| } |
| |
| @Test |
| public void largeLong() { |
| // Don't use MAX_VALUE because it is easy to check for explicitly |
| long tooLarge = Long.MAX_VALUE - 100; |
| AtomicBackoff backoff = new AtomicBackoff("test", tooLarge); |
| backoff.getState().backoff(); |
| // It would also be okay if it became MAX_VALUE |
| assertEquals(tooLarge, backoff.getState().get()); |
| } |
| } |