Subversion Repositories SmartDukaan

/*

 * 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 in.shop2020.web.mappers;

import java.util.List;

import java.util.logging.Logger;

import org.apache.hadoop.io.NullWritable;

import com.google.appengine.api.datastore.Entity;

import com.google.appengine.api.datastore.Key;

import com.google.appengine.tools.mapreduce.AppEngineMapper;

/**

 * A sample AppEngine mapper.

 * 

 * @author frew@google.com (Fred Wulff)

 */

public class TestMapper extends

        AppEngineMapper<Key, Entity, NullWritable, NullWritable> {

    private static final Logger log = Logger.getLogger(TestMapper.class

            .getName());

    public TestMapper() {

    }

    @Override

    public void taskSetup(Context context) {

        log.warning("Doing per-task setup");

    }

    @Override

    public void taskCleanup(Context context) {

        log.warning("Doing per-task cleanup");

    }

    @Override

    public void setup(Context context) {

        log.warning("Doing per-worker setup");

    }

    @Override

    public void cleanup(Context context) {

        log.warning("Doing per-worker cleanup");

    }

    // This is a silly mapper that's intended to show some of the capabilities

    // of the API.

    @Override

    public void map(Key key, Entity value, Context context) {

        countItemEvent("ADD_TO_CART", key, value, context);

        countItemEvent("DELETE_FROM_CART", key, value, context);

        countProductEvent("PRODUCT_VIEW", key, value, context);

        countItemEvent("PRODUCT_COMPARE", key, value, context);

        countItemEvent("RESEARCH_ADD", key, value, context);

        countItemEvent("RESEARCH_DELETE", key, value, context);

    }

    private void countProductEvent(String eventType, Key key, Entity value, Context context) {

        if (value.hasProperty("eventType") && value.getProperty("eventType")!=null) {

            if (value.getProperty("eventType").toString().equals(eventType)) {

                    String productName = value.getProperty("productName").toString();

                    context.getCounter(productName, eventType).increment(1);

            }

        }

    }

    @SuppressWarnings("unchecked")

    private void countItemEvent(String eventType, Key key, Entity value,

            Context context) {

        if (value.hasProperty("eventType") && value.getProperty("eventType")!=null) {

            if (value.getProperty("eventType").toString().equals(eventType)) {

                try {

                    List<Long> entityIds = (List<Long>)value.getProperty("itemIds");

                    for (Long entityId : entityIds) {

                        context.getCounter(entityId.toString(), eventType).increment(1);

                    }

                }

                catch (ClassCastException e) {

                    try {

                        Long entityId = (Long) value.getProperty("itemIds");

                        context.getCounter(entityId.toString(), eventType).increment(1);

                    }

                    catch (ClassCastException e1) {

                        log.warning("Unable to cast entityIds to List of long or long.");

                    }

                }

            }

        }

    }

}