GetTweetsOperation.java

/*******************************************************************************
 * Copyright 2010 Universidade do Minho, Ricardo Vila�a and Francisco Cruz
 * 
 * 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 org.ublog.benchmark.social.cassandra;

import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.ublog.benchmark.BenchOperation;
import org.ublog.benchmark.ComplexBenchMarkClient;
import org.ublog.benchmark.operations.CollectionOperation;
import org.ublog.benchmark.operations.DataStoreOperation;
import org.ublog.benchmark.operations.GetOperation;
import org.ublog.benchmark.operations.GetRangeOperation;
import org.ublog.benchmark.operations.OperationListener;
import org.ublog.benchmark.social.Message;
import org.ublog.benchmark.social.SocialBenchmark;
import org.ublog.benchmark.social.UserService;
import org.ublog.benchmark.social.Utils;

public class GetTweetsOperation implements BenchOperation, OperationListener {

	private ComplexBenchMarkClient client;
	private String userId;
	private Map<String, String> user;
	private List<Message> tweetList;
	private int start, count;
	private boolean finished;

	public GetTweetsOperation(ComplexBenchMarkClient client, String userId,
			int start, int count) {
		this.client = client;
		this.userId = userId;
		this.start = start;
		this.count = count;
		this.finished = false;
		this.user = null;
		this.tweetList = new ArrayList<Message>();
	}

	@Override
	public String getName() {
		return "twitter:getTweets";
	}

	public List<Message> getResult() {
		return this.tweetList;
	}

	@SuppressWarnings("unchecked")
	@Override
	public CollectionOperation getNextDBOperation()
			throws UnsupportedEncodingException {
		CollectionOperation res;
		if (this.user == null) {
			List<byte[]> columns = new ArrayList<byte[]>();
			columns.add("lastTweet".getBytes("UTF-8"));
			res = new GetOperation(client, SocialBenchmark.userTable, userId,
					columns);
		} else {
			int lastTweet = Integer.valueOf(this.user
					.get(UserService.LAST_TWEET));
			String min = userId
					+ "-"
					+ Utils.getTweetPadding(Math.max(1, lastTweet - this.start
							- this.count + 1));
			String max = userId
					+ "-"
					+ Utils.getTweetPadding(Math.max(1, lastTweet - this.start));
			res = new GetRangeOperation(client, SocialBenchmark.tweetsTable,
					min, max);
			finished = true;
		}
		res.addListener(this);
		return res;
	}

	@Override
	public boolean hasMoreDBOperations() {
		return !finished;
	}

	@SuppressWarnings("unchecked")
	@Override
	public void handleFinishedOperation(DataStoreOperation op) {
		if (this.user == null) {
			this.user = ((Map<String, String>) ((GetOperation) op).getResult());
		} else {
			for (Map<String, String> tweetMap : ((Set<Map<String, String>>) ((GetRangeOperation) op)
					.getResult())) {
				if (!tweetMap.isEmpty()) {
					tweetList.add(Utils.toTweet(tweetMap));
				}
			}
			this.client.handleFinishedComplexOperation(this);
		}

	}

	@Override
	public String toString() {
		return "GetTweetsOperation [count=" + count + ", start=" + start
				+ ", userId=" + userId + "]";
	}

	@Override
	public boolean isReadOnly() {
		return true;
	}

	@Override
	public boolean isInit() {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public void setInit(boolean init) {
		// TODO Auto-generated method stub

	}

}