| /* |
| * 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.ignite.examples.binary.computegrid; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| import org.apache.ignite.compute.ComputeJob; |
| import org.apache.ignite.compute.ComputeJobAdapter; |
| import org.apache.ignite.compute.ComputeJobResult; |
| import org.apache.ignite.compute.ComputeTaskSplitAdapter; |
| import org.apache.ignite.lang.IgniteBiTuple; |
| import org.apache.ignite.binary.BinaryObject; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * Task that is used for {@link ComputeClientBinaryTaskExecutionExample} and |
| * similar examples in .NET and C++. |
| * <p> |
| * This task calculates average salary for provided collection of employees. |
| * It splits the collection into batches of size {@code 3} and creates a job |
| * for each batch. After all jobs are executed, there results are reduced to |
| * get the average salary. |
| */ |
| public class ComputeClientTask extends ComputeTaskSplitAdapter<Collection<BinaryObject>, Long> { |
| /** {@inheritDoc} */ |
| @Override protected Collection<? extends ComputeJob> split( |
| int gridSize, |
| Collection<BinaryObject> arg |
| ) { |
| Collection<ComputeClientJob> jobs = new ArrayList<>(); |
| |
| Collection<BinaryObject> employees = new ArrayList<>(); |
| |
| // Split provided collection into batches and |
| // create a job for each batch. |
| for (BinaryObject employee : arg) { |
| employees.add(employee); |
| |
| if (employees.size() == 3) { |
| jobs.add(new ComputeClientJob(employees)); |
| |
| employees = new ArrayList<>(3); |
| } |
| } |
| |
| if (!employees.isEmpty()) |
| jobs.add(new ComputeClientJob(employees)); |
| |
| return jobs; |
| } |
| |
| /** {@inheritDoc} */ |
| @Nullable @Override public Long reduce(List<ComputeJobResult> results) { |
| long sum = 0; |
| int cnt = 0; |
| |
| for (ComputeJobResult res : results) { |
| IgniteBiTuple<Long, Integer> t = res.getData(); |
| |
| sum += t.get1(); |
| cnt += t.get2(); |
| } |
| |
| return sum / cnt; |
| } |
| |
| /** |
| * Remote job for {@link ComputeClientTask}. |
| */ |
| private static class ComputeClientJob extends ComputeJobAdapter { |
| /** Collection of employees. */ |
| private final Collection<BinaryObject> employees; |
| |
| /** |
| * @param employees Collection of employees. |
| */ |
| private ComputeClientJob(Collection<BinaryObject> employees) { |
| this.employees = employees; |
| } |
| |
| /** {@inheritDoc} */ |
| @Nullable @Override public Object execute() { |
| long sum = 0; |
| int cnt = 0; |
| |
| for (BinaryObject employee : employees) { |
| System.out.println(">>> Processing employee: " + employee.field("name")); |
| |
| // Get salary from binary object. Note that object |
| // doesn't need to be fully deserialized. |
| long salary = employee.field("salary"); |
| |
| sum += salary; |
| cnt++; |
| } |
| |
| return new IgniteBiTuple<>(sum, cnt); |
| } |
| } |
| } |