| /* |
| * 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.beam.runners.direct; |
| |
| import static org.apache.beam.vendor.guava.v20_0.com.google.common.base.Preconditions.checkArgument; |
| |
| import org.joda.time.Duration; |
| import org.joda.time.Instant; |
| |
| /** |
| * A clock that returns a constant value for now which can be set with calls to {@link |
| * #set(Instant)}. |
| * |
| * <p>For uses of the {@link Clock} interface in unit tests. |
| */ |
| class MockClock implements Clock { |
| |
| private Instant now; |
| |
| public static MockClock fromInstant(Instant initial) { |
| return new MockClock(initial); |
| } |
| |
| private MockClock(Instant initialNow) { |
| this.now = initialNow; |
| } |
| |
| public void set(Instant newNow) { |
| checkArgument( |
| !newNow.isBefore(now), |
| "Cannot move MockClock backwards in time from %s to %s", |
| now, |
| newNow); |
| this.now = newNow; |
| } |
| |
| public void advance(Duration duration) { |
| checkArgument( |
| duration.getMillis() > 0, |
| "Cannot move MockClock backwards in time by duration %s", |
| duration); |
| set(now.plus(duration)); |
| } |
| |
| @Override |
| public Instant now() { |
| return now; |
| } |
| } |