| /* |
| * 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.core.triggers; |
| |
| import java.util.Arrays; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.annotations.VisibleForTesting; |
| |
| /** |
| * Executes the {@code actual} trigger until it finishes or until the {@code until} trigger fires. |
| */ |
| class OrFinallyStateMachine extends TriggerStateMachine { |
| |
| private static final int ACTUAL = 0; |
| private static final int UNTIL = 1; |
| |
| @VisibleForTesting |
| OrFinallyStateMachine(TriggerStateMachine actual, TriggerStateMachine until) { |
| super(Arrays.asList(actual, until)); |
| } |
| |
| @Override |
| public void onElement(OnElementContext c) throws Exception { |
| c.trigger().subTrigger(ACTUAL).invokeOnElement(c); |
| c.trigger().subTrigger(UNTIL).invokeOnElement(c); |
| } |
| |
| @Override |
| public void onMerge(OnMergeContext c) throws Exception { |
| for (ExecutableTriggerStateMachine subTrigger : c.trigger().subTriggers()) { |
| subTrigger.invokeOnMerge(c); |
| } |
| updateFinishedState(c); |
| } |
| |
| @Override |
| public boolean shouldFire(TriggerStateMachine.TriggerContext context) throws Exception { |
| return context.trigger().subTrigger(ACTUAL).invokeShouldFire(context) |
| || context.trigger().subTrigger(UNTIL).invokeShouldFire(context); |
| } |
| |
| @Override |
| public void onFire(TriggerStateMachine.TriggerContext context) throws Exception { |
| ExecutableTriggerStateMachine actualSubtrigger = context.trigger().subTrigger(ACTUAL); |
| ExecutableTriggerStateMachine untilSubtrigger = context.trigger().subTrigger(UNTIL); |
| |
| if (untilSubtrigger.invokeShouldFire(context)) { |
| untilSubtrigger.invokeOnFire(context); |
| actualSubtrigger.invokeClear(context); |
| } else { |
| // If until didn't fire, then the actual must have (or it is forbidden to call |
| // onFire) so we are done only if actual is done. |
| actualSubtrigger.invokeOnFire(context); |
| // Do not clear the until trigger, because it tracks data cross firings. |
| } |
| updateFinishedState(context); |
| } |
| |
| @Override |
| public String toString() { |
| return String.format("%s.orFinally(%s)", subTriggers.get(ACTUAL), subTriggers.get(UNTIL)); |
| } |
| |
| private void updateFinishedState(TriggerContext c) throws Exception { |
| boolean anyStillFinished = false; |
| for (ExecutableTriggerStateMachine subTrigger : c.trigger().subTriggers()) { |
| anyStillFinished |= c.forTrigger(subTrigger).trigger().isFinished(); |
| } |
| c.trigger().setFinished(anyStillFinished); |
| } |
| } |