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[feat 32473] Added soft deadline logic to Spanner Change Stream IO co…
…nnector. (#32474) * added explicit restriction interrupter class
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.../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/RestrictionInterrupter.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,85 @@ | ||
| /* | ||
| * 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.sdk.io.gcp.spanner.changestreams.restriction; | ||
|
|
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| import java.util.function.Supplier; | ||
| import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.annotations.VisibleForTesting; | ||
| import org.checkerframework.checker.nullness.qual.NonNull; | ||
| import org.checkerframework.checker.nullness.qual.Nullable; | ||
| import org.joda.time.Duration; | ||
| import org.joda.time.Instant; | ||
|
|
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| /** An interrupter for restriction tracker of type T. */ | ||
| public class RestrictionInterrupter<T> { | ||
| private @Nullable T lastAttemptedPosition; | ||
|
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| private Supplier<Instant> timeSupplier; | ||
| private final Instant softDeadline; | ||
| private boolean hasInterrupted = true; | ||
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| /** | ||
| * Sets a soft timeout from now for processing new positions. After the timeout the tryInterrupt | ||
| * will start returning true indicating an early exit from processing. | ||
| */ | ||
| public static <T> RestrictionInterrupter<T> withSoftTimeout(Duration timeout) { | ||
| return new RestrictionInterrupter<T>(() -> Instant.now(), timeout); | ||
| } | ||
|
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| RestrictionInterrupter(Supplier<Instant> timeSupplier, Duration timeout) { | ||
| this.timeSupplier = timeSupplier; | ||
| this.softDeadline = this.timeSupplier.get().plus(timeout); | ||
| hasInterrupted = false; | ||
| } | ||
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| @VisibleForTesting | ||
| void setTimeSupplier(Supplier<Instant> timeSupplier) { | ||
| this.timeSupplier = timeSupplier; | ||
| } | ||
|
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| /** | ||
| * Returns true if the restriction tracker should be interrupted in claiming new positions. | ||
| * | ||
| * <ol> | ||
| * <li>If soft deadline hasn't been reached always returns false. | ||
| * <li>If soft deadline has been reached but we haven't processed any positions returns false. | ||
| * <li>If soft deadline has been reached but the new position is the same as the last attempted | ||
| * position returns false. | ||
| * <li>If soft deadline has been reached and the new position differs from the last attempted | ||
| * position returns true. | ||
| * </ol> | ||
| * | ||
| * @return {@code true} if the position processing should continue, {@code false} if the soft | ||
| * deadline has been reached and we have fully processed the previous position. | ||
| */ | ||
| public boolean tryInterrupt(@NonNull T position) { | ||
| if (hasInterrupted) { | ||
| return true; | ||
| } | ||
| if (lastAttemptedPosition == null) { | ||
| lastAttemptedPosition = position; | ||
| return false; | ||
| } | ||
| if (position.equals(lastAttemptedPosition)) { | ||
| return false; | ||
| } | ||
| lastAttemptedPosition = position; | ||
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| hasInterrupted |= timeSupplier.get().isAfter(softDeadline); | ||
| return hasInterrupted; | ||
| } | ||
| } |
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