DatabaseSharding2Test.java

/*
* Copyright 2014 mango.jfaster.org
*
* The Mango Project 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.jfaster.mango.sharding;

import com.google.common.collect.HashMultiset;
import com.google.common.collect.Multiset;
import org.jfaster.mango.annotation.*;
import org.jfaster.mango.datasource.SimpleDataSourceFactory;
import org.jfaster.mango.operator.Mango;
import org.jfaster.mango.support.DataSourceConfig;
import org.jfaster.mango.support.Randoms;
import org.jfaster.mango.support.Table;
import org.jfaster.mango.support.model4table.Msg;
import org.junit.Before;
import org.junit.Test;

import javax.sql.DataSource;
import java.sql.Connection;
import java.util.ArrayList;
import java.util.List;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.*;

/**
 * 测试数据源路由
 *
 * @author ash
 */
public class DatabaseSharding2Test {

  private static Mango mango;
  private static String[] dsns = new String[]{"ds1", "ds2", "ds3"};

  @Before
  public void before() throws Exception {
    mango = Mango.newInstance();
    for (int i = 0; i < 3; i++) {
      DataSource ds = DataSourceConfig.getDataSource(i + 1);
      Connection conn = ds.getConnection();
      Table.MSG.load(conn);
      conn.close();
      mango.addDataSourceFactory(new SimpleDataSourceFactory(dsns[i], ds));
    }
  }

  @Test
  public void testRandomPartition() {
    MsgDao dao = mango.create(MsgDao.class);
    int num = 100;
    List<Msg> msgs = Msg.createRandomMsgs(num);
    for (Msg msg : msgs) {
      int id = dao.insert(msg);
      assertThat(id, greaterThan(0));
      msg.setId(id);
    }
    check(msgs, dao);
    for (Msg msg : msgs) {
      msg.setContent(Randoms.randomString(20));
    }
    dao.batchUpdate(msgs);
    check(msgs, dao);
  }

  @Test
  public void testOnePartition() {
    MsgDao dao = mango.create(MsgDao.class);
    int num = 10;
    int uid = 100;
    List<Msg> msgs = new ArrayList<Msg>();
    for (int i = 0; i < num; i++) {
      Msg msg = new Msg();
      msg.setUid(uid);
      msg.setContent(Randoms.randomString(20));
      msgs.add(msg);
      int id = dao.insert(msg);
      msg.setId(id);
    }
    check(msgs, dao);
    for (Msg msg : msgs) {
      msg.setContent(Randoms.randomString(20));
    }
    dao.batchUpdate(msgs);
    check(msgs, dao);
  }

  private void check(List<Msg> msgs, MsgDao dao) {
    List<Msg> dbMsgs = new ArrayList<Msg>();
    Multiset<Integer> ms = HashMultiset.create();
    for (Msg msg : msgs) {
      ms.add(msg.getUid());
    }
    for (Multiset.Entry<Integer> entry : ms.entrySet()) {
      dbMsgs.addAll(dao.getMsgs(entry.getElement()));
    }
    assertThat(dbMsgs, hasSize(msgs.size()));
    assertThat(dbMsgs, containsInAnyOrder(msgs.toArray()));
  }


  @DB(table = "msg")
  @Sharding(databaseShardingStrategy = MyDatabaseShardingStrategy.class)
  interface MsgDao {

    @ReturnGeneratedId
    @SQL("insert into #table(uid, content) values(:1.uid, :1.content)")
    int insert(@ShardingBy("uid") Msg msg);

    @SQL("update #table set content=:1.content where id=:1.id and uid=:1.uid")
    public int[] batchUpdate(@ShardingBy("uid") List<Msg> msgs);

    @SQL("select id, uid, content from #table where uid=:1")
    public List<Msg> getMsgs(@ShardingBy int uid);

  }

  public static class MyDatabaseShardingStrategy implements DatabaseShardingStrategy<Integer> {

    @Override
    public String getDataSourceFactoryName(Integer uid) {
      int tail = uid % 10;
      if (tail >= 0 && tail <= 2) {
        return dsns[0];
      } else if (tail >= 3 && tail <= 5) {
        return dsns[1];
      } else {
        return dsns[2];
      }
    }

  }

}