com.google.appengine.tools.mapreduce.AppEngineMapperTest.java Source code

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Here is the source code for com.google.appengine.tools.mapreduce.AppEngineMapperTest.java

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/*
 * Copyright 2010 Google Inc.
 *
 * Licensed 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 com.google.appengine.tools.mapreduce;

import com.google.appengine.api.datastore.DatastoreServiceFactory;
import com.google.appengine.api.datastore.DatastoreService;
import com.google.appengine.api.datastore.Entity;
import com.google.appengine.api.datastore.FetchOptions;
import com.google.appengine.api.datastore.Query;
import com.google.appengine.tools.development.testing.LocalDatastoreServiceTestConfig;
import com.google.appengine.tools.development.testing.LocalServiceTestHelper;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.TaskAttemptID;

import junit.framework.TestCase;

/**
 * Tests the {@link AppEngineMapper} class.
 *
 */
public class AppEngineMapperTest extends TestCase {
    private static class TestMapper
            extends AppEngineMapper<NullWritable, NullWritable, NullWritable, NullWritable> {
        private boolean shouldOutput = false;

        @Override
        public void map(NullWritable key, NullWritable value, Context context) {
            if (shouldOutput) {
                Entity foo = new Entity("foo");
                ((AppEngineContext) context).getMutationPool().put(foo);
            }
        }

        public void shouldOutputEntity(boolean shouldOutput) {
            this.shouldOutput = shouldOutput;
        }
    }

    private final LocalServiceTestHelper helper = new LocalServiceTestHelper(new LocalDatastoreServiceTestConfig());

    private DatastoreService datastoreService;
    private TestMapper mapper;
    private TestMapper.AppEngineContext context;

    @Override
    protected void setUp() throws Exception {
        super.setUp();
        helper.setUp();
        // datastoreService = DatastoreServiceFactory.getDatastoreService();
        mapper = new TestMapper();
        Configuration conf = new Configuration(false);
        TaskAttemptID id = new TaskAttemptID("foo", 1, true, 1, 1);
        context = mapper.new AppEngineContext(conf, id, null, null, null, null, null);
        datastoreService = DatastoreServiceFactory.getDatastoreService();
    }

    @Override
    protected void tearDown() throws Exception {
        helper.tearDown();
        super.tearDown();
    }

    /**
     * Just makes sure that things don't explode in the no mutation pool
     * case.
     */
    public void testNoMutationPool() throws Exception {
        mapper.setup(context);
        mapper.taskSetup(context);
        mapper.map(NullWritable.get(), NullWritable.get(), context);
        mapper.taskCleanup(context);
        mapper.cleanup(context);
    }

    public void testPartialMutationPool() throws Exception {
        mapper.shouldOutputEntity(true);
        mapper.setup(context);
        mapper.taskSetup(context);
        mapper.map(NullWritable.get(), NullWritable.get(), context);
        assertEquals(0,
                datastoreService.prepare(new Query("foo")).countEntities(FetchOptions.Builder.withDefaults()));
        mapper.taskCleanup(context);
        mapper.cleanup(context);
        assertEquals(1,
                datastoreService.prepare(new Query("foo")).countEntities(FetchOptions.Builder.withDefaults()));
    }

    public void testMutationPool() throws Exception {
        mapper.shouldOutputEntity(true);
        mapper.setup(context);
        mapper.taskSetup(context);
        for (int i = 0; i < DatastoreMutationPool.DEFAULT_COUNT_LIMIT - 1; i++) {
            mapper.map(NullWritable.get(), NullWritable.get(), context);
        }
        assertEquals(0,
                datastoreService.prepare(new Query("foo")).countEntities(FetchOptions.Builder.withDefaults()));
        mapper.map(NullWritable.get(), NullWritable.get(), context);
        assertEquals(DatastoreMutationPool.DEFAULT_COUNT_LIMIT,
                datastoreService.prepare(new Query("foo")).countEntities(FetchOptions.Builder.withDefaults()));
        mapper.taskCleanup(context);
        mapper.cleanup(context);
        assertEquals(DatastoreMutationPool.DEFAULT_COUNT_LIMIT,
                datastoreService.prepare(new Query("foo")).countEntities(FetchOptions.Builder.withDefaults()));
    }

    public void testMutationPoolFlushParameters() throws Exception {
        mapper.shouldOutputEntity(true);
        mapper.setup(context);
        mapper.taskSetup(context);
        context.setMutationPoolFlushParameters(10, 100000);
        for (int i = 0; i < 10 - 1; i++) {
            mapper.map(NullWritable.get(), NullWritable.get(), context);
        }
        assertEquals(0,
                datastoreService.prepare(new Query("foo")).countEntities(FetchOptions.Builder.withDefaults()));
        mapper.map(NullWritable.get(), NullWritable.get(), context);
        assertEquals(10,
                datastoreService.prepare(new Query("foo")).countEntities(FetchOptions.Builder.withDefaults()));
        mapper.taskCleanup(context);
        mapper.cleanup(context);
        assertEquals(10,
                datastoreService.prepare(new Query("foo")).countEntities(FetchOptions.Builder.withDefaults()));
    }

    public void testMutationPoolFlushParametersIllegalState() throws Exception {
        context.getMutationPool();
        try {
            context.setMutationPoolFlushParameters(10, 5);
            fail("Should have thrown IllegalStateException");
        } catch (IllegalStateException expected) {
        }
    }
}