| /** |
| * 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.flink.runtime.operators; |
| |
| import org.apache.flink.api.common.functions.FlatJoinFunction; |
| import org.apache.flink.api.common.typeutils.TypeComparator; |
| import org.apache.flink.api.common.typeutils.TypeComparatorFactory; |
| import org.apache.flink.api.common.typeutils.TypePairComparator; |
| import org.apache.flink.api.common.typeutils.TypePairComparatorFactory; |
| import org.apache.flink.api.common.typeutils.TypeSerializer; |
| import org.apache.flink.runtime.iterative.concurrent.SolutionSetBroker; |
| import org.apache.flink.runtime.iterative.task.AbstractIterativePactTask; |
| import org.apache.flink.runtime.operators.hash.CompactingHashTable; |
| import org.apache.flink.runtime.operators.util.TaskConfig; |
| import org.apache.flink.util.Collector; |
| import org.apache.flink.util.MutableObjectIterator; |
| |
| public class JoinWithSolutionSetFirstDriver<IT1, IT2, OT> implements ResettablePactDriver<FlatJoinFunction<IT1, IT2, OT>, OT> { |
| |
| private PactTaskContext<FlatJoinFunction<IT1, IT2, OT>, OT> taskContext; |
| |
| private CompactingHashTable<IT1> hashTable; |
| |
| private TypeComparator<IT2> probeSideComparator; |
| |
| private TypePairComparator<IT2, IT1> pairComparator; |
| |
| private IT1 solutionSideRecord; |
| private IT2 probeSideRecord; |
| |
| protected volatile boolean running; |
| |
| // -------------------------------------------------------------------------------------------- |
| |
| @Override |
| public void setup(PactTaskContext<FlatJoinFunction<IT1, IT2, OT>, OT> context) { |
| this.taskContext = context; |
| this.running = true; |
| } |
| |
| @Override |
| public int getNumberOfInputs() { |
| return 1; |
| } |
| |
| @Override |
| public Class<FlatJoinFunction<IT1, IT2, OT>> getStubType() { |
| @SuppressWarnings("unchecked") |
| final Class<FlatJoinFunction<IT1, IT2, OT>> clazz = (Class<FlatJoinFunction<IT1, IT2, OT>>) (Class<?>) FlatJoinFunction.class; |
| return clazz; |
| } |
| |
| @Override |
| public boolean requiresComparatorOnInput() { |
| return true; |
| } |
| |
| @Override |
| public boolean isInputResettable(int inputNum) { |
| if (inputNum < 0 || inputNum > 1) { |
| throw new IndexOutOfBoundsException(); |
| } |
| |
| // from the perspective of the task that runs this operator, there is only one input, which is not resettable |
| // we implement the resettable interface only in order to avoid that this class is re-instantiated for |
| // every iterations |
| return false; |
| } |
| |
| // -------------------------------------------------------------------------------------------- |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public void initialize() { |
| |
| // grab a handle to the hash table from the iteration broker |
| if (taskContext instanceof AbstractIterativePactTask) { |
| AbstractIterativePactTask<?, ?> iterativeTaskContext = (AbstractIterativePactTask<?, ?>) taskContext; |
| String identifier = iterativeTaskContext.brokerKey(); |
| this.hashTable = (CompactingHashTable<IT1>) SolutionSetBroker.instance().get(identifier); |
| } else { |
| throw new RuntimeException("The task context of this driver is no iterative task context."); |
| } |
| |
| TaskConfig config = taskContext.getTaskConfig(); |
| ClassLoader classLoader = taskContext.getUserCodeClassLoader(); |
| |
| TypeSerializer<IT1> solutionSetSerializer = this.hashTable.getBuildSideSerializer(); |
| TypeSerializer<IT2> probeSideSerializer = taskContext.<IT2>getInputSerializer(0).getSerializer(); |
| |
| TypeComparatorFactory<IT2> probeSideComparatorFactory = config.getDriverComparator(0, classLoader); |
| TypeComparator<IT1> solutionSetComparator = this.hashTable.getBuildSideComparator().duplicate(); |
| this.probeSideComparator = probeSideComparatorFactory.createComparator(); |
| |
| solutionSideRecord = solutionSetSerializer.createInstance(); |
| probeSideRecord = probeSideSerializer.createInstance(); |
| |
| TypePairComparatorFactory<IT1, IT2> factory = taskContext.getTaskConfig().getPairComparatorFactory(taskContext.getUserCodeClassLoader()); |
| pairComparator = factory.createComparator21(solutionSetComparator, this.probeSideComparator); |
| } |
| |
| @Override |
| public void prepare() { |
| // nothing to prepare in each iteration |
| // later, if we support out-of-core operation, we need to put the code in here |
| // that brings the initial in-memory partitions into memory |
| } |
| |
| @Override |
| public void run() throws Exception { |
| |
| final FlatJoinFunction<IT1, IT2, OT> joinFunction = taskContext.getStub(); |
| final Collector<OT> collector = taskContext.getOutputCollector(); |
| |
| IT1 buildSideRecord = this.solutionSideRecord; |
| IT2 probeSideRecord = this.probeSideRecord; |
| |
| final CompactingHashTable<IT1> join = hashTable; |
| final MutableObjectIterator<IT2> probeSideInput = taskContext.<IT2>getInput(0); |
| |
| final CompactingHashTable<IT1>.HashTableProber<IT2> prober = join.getProber(probeSideComparator, pairComparator); |
| while (this.running && ((probeSideRecord = probeSideInput.next(probeSideRecord)) != null)) { |
| buildSideRecord = prober.getMatchFor(probeSideRecord, buildSideRecord); |
| joinFunction.join(buildSideRecord, probeSideRecord, collector); |
| } |
| } |
| |
| @Override |
| public void cleanup() {} |
| |
| @Override |
| public void reset() {} |
| |
| @Override |
| public void teardown() { |
| // hash table is torn down by the iteration head task |
| } |
| |
| @Override |
| public void cancel() { |
| this.running = false; |
| } |
| } |