| /** |
| * 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.apex.malhar.lib.state.managed; |
| |
| import javax.validation.constraints.NotNull; |
| |
| import org.joda.time.Duration; |
| |
| import org.apache.apex.malhar.lib.state.spillable.WindowListener; |
| |
| import com.esotericsoftware.kryo.serializers.FieldSerializer; |
| import com.esotericsoftware.kryo.serializers.JavaSerializer; |
| import com.google.common.base.Preconditions; |
| |
| import com.datatorrent.api.Context; |
| |
| /** |
| * Abstract class to extract a bucket for a given time |
| * |
| * @since 3.7.0 |
| */ |
| public abstract class TimeBucketAssigner implements ManagedStateComponent, WindowListener |
| { |
| private transient PurgeListener purgeListener; |
| |
| private boolean initialized; |
| |
| @FieldSerializer.Bind(JavaSerializer.class) |
| private Duration bucketSpan; |
| |
| @Override |
| public void setup(@NotNull ManagedStateContext managedStateContext) |
| { |
| Context.OperatorContext context = managedStateContext.getOperatorContext(); |
| if (!initialized && bucketSpan == null) { |
| setBucketSpan(Duration.millis(context.getValue(Context.OperatorContext.APPLICATION_WINDOW_COUNT) * |
| context.getValue(Context.DAGContext.STREAMING_WINDOW_SIZE_MILLIS))); |
| } |
| } |
| |
| /** |
| * Get the time bucket for any given time |
| * @param time |
| * @return |
| */ |
| public abstract long getTimeBucket(long time); |
| |
| /** |
| * Get possible number of buckets |
| * @return |
| */ |
| public abstract long getNumBuckets(); |
| |
| /** |
| * @return time-bucket span |
| */ |
| public Duration getBucketSpan() |
| { |
| return bucketSpan; |
| } |
| |
| /** |
| * Sets the length of a time bucket. |
| * @param bucketSpan length of time bucket |
| */ |
| public void setBucketSpan(Duration bucketSpan) |
| { |
| this.bucketSpan = bucketSpan; |
| } |
| |
| public boolean isInitialized() |
| { |
| return initialized; |
| } |
| |
| public void setInitialized(boolean initialized) |
| { |
| this.initialized = initialized; |
| } |
| |
| /** |
| * Sets the purge listener. |
| * @param purgeListener purge listener |
| */ |
| public void setPurgeListener(@NotNull PurgeListener purgeListener) |
| { |
| this.purgeListener = Preconditions.checkNotNull(purgeListener, "purge listener"); |
| } |
| |
| public PurgeListener getPurgeListener() |
| { |
| return purgeListener; |
| } |
| |
| /** |
| * The listener is informed when the time slides and time buckets which are older than the smallest time bucket |
| * (changed because of time slide) can be purged. |
| */ |
| public interface PurgeListener |
| { |
| void purgeTimeBucketsLessThanEqualTo(long timeBucket); |
| } |
| } |