Examples of org.apache.hadoop.hbase.client.HConnection

org.apache.hadoop.hbase.client.HConnection
A cluster connection. Knows how to find the master, locate regions out on the cluster, keeps a cache of locations and then knows how to re-calibrate after they move. {@link HConnectionManager} manages instances of this class. This is NOT a connection to aparticular server but to all servers in the cluster. Individual connections are managed at a lower level.
HConnections are used by {@link HTable} mostly but also by{@link HBaseAdmin}, and {@link CatalogTracker}. HConnection instances can be shared. Sharing is usually what you want because rather than each HConnection instance having to do its own discovery of regions out on the cluster, instead, all clients get to share the one cache of locations. {@link HConnectionManager} does thesharing for you if you go by it getting connections. Sharing makes cleanup of HConnections awkward. See {@link HConnectionManager} for cleanup discussion. @see HConnectionManager

   * when done with this mocked Connection.
   * @throws IOException
   */
  private HConnection mockConnection(final HRegionInterface implementation)
  throws IOException {
    HConnection connection =
      HConnectionTestingUtility.getMockedConnection(UTIL.getConfiguration());
    Mockito.doNothing().when(connection).close();
    // Make it so we return any old location when asked.
    final HRegionLocation anyLocation =
      new HRegionLocation(HRegionInfo.FIRST_META_REGIONINFO, SN.getHostname(),
        SN.getPort());
    Mockito.when(connection.getRegionLocation((byte[]) Mockito.any(),
        (byte[]) Mockito.any(), Mockito.anyBoolean())).
      thenReturn(anyLocation);
    Mockito.when(connection.locateRegion((byte[]) Mockito.any(),
        (byte[]) Mockito.any())).
      thenReturn(anyLocation);
    if (implementation != null) {
      // If a call to getHRegionConnection, return this implementation.
      Mockito.when(connection.getHRegionConnection(Mockito.anyString(), Mockito.anyInt())).
        thenReturn(implementation);
    }
    return connection;
  }

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    ht.close();
    HRegionServer server = TEST_UTIL.getHBaseCluster().getRegionServer(0);
    byte []firstRow = Bytes.toBytes("aaa");
    byte []splitRow = Bytes.toBytes("lll");
    byte []lastRow = Bytes.toBytes("zzz");
    HConnection con = HConnectionManager
        .getConnection(TEST_UTIL.getConfiguration());
    // this will also cache the region
    byte[] regionName = con.locateRegion(tableName, splitRow).getRegionInfo()
        .getRegionName();
    HRegion region = server.getRegion(regionName);
    SplitTransaction split = new SplitTransaction(region, splitRow);
    split.prepare();

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    // Return a good result first and then return null to indicate end of scan
    Mockito.when(implementation.next(Mockito.anyLong(), Mockito.anyInt())).
      thenReturn(new Result [] {r}, (Result [])null);


    // Get a connection w/ mocked up common methods.
    HConnection connection =
      HConnectionTestingUtility.getMockedConnectionAndDecorate(HTU.getConfiguration(),
        implementation, SERVERNAME_B, REGIONINFO);


    // Make it so we can get a catalogtracker from servermanager.. .needed
    // down in guts of server shutdown handler.

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      Mockito.when(ri.next(Mockito.anyLong(), Mockito.anyInt())).thenReturn(new Result[] { r });
      // If a get, return the above result too for REGIONINFO
      Mockito.when(ri.get((byte[]) Mockito.any(), (Get) Mockito.any())).thenReturn(r);
    }
    // Get a connection w/ mocked up common methods.
    HConnection connection = HConnectionTestingUtility.
      getMockedConnectionAndDecorate(HTU.getConfiguration(), ri, SERVERNAME_B,
        REGIONINFO);
    // Make it so we can get the connection from our mocked catalogtracker
    Mockito.when(ct.getConnection()).thenReturn(connection);
    // Create and startup an executor. Used by AM handling zk callbacks.

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            return builder.build();
          }
      });


    // Get a connection w/ mocked up common methods.
    HConnection connection =
      HConnectionTestingUtility.getMockedConnectionAndDecorate(HTU.getConfiguration(),
        null, implementation, SERVERNAME_B, REGIONINFO);


    // Make it so we can get a catalogtracker from servermanager.. .needed
    // down in guts of server shutdown handler.

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    GetResponse.Builder getBuilder = GetResponse.newBuilder();
    getBuilder.setResult(ProtobufUtil.toResult(r));
    Mockito.when(ri.get((RpcController)Mockito.any(), (GetRequest) Mockito.any())).
      thenReturn(getBuilder.build());
    // Get a connection w/ mocked up common methods.
    HConnection connection = HConnectionTestingUtility.
      getMockedConnectionAndDecorate(HTU.getConfiguration(), null,
        ri, SERVERNAME_B, REGIONINFO);
    // Make it so we can get the connection from our mocked catalogtracker
    Mockito.when(ct.getConnection()).thenReturn(connection);
    // Create and startup an executor. Used by AM handling zk callbacks.

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    Path tableDir = new Path(getDefaultRootDirPath().toString()
        + System.getProperty("file.separator") + htd.getTableName()
        + System.getProperty("file.separator") + regionToDeleteInFS);
    FileSystem.get(c).delete(tableDir);
    // flush cache of regions
    HConnection conn = table.getConnection();
    conn.clearRegionCache();
    // assign all the new regions IF table is enabled.
    HBaseAdmin admin = getHBaseAdmin();
    if (admin.isTableEnabled(table.getTableName())) {
      for(HRegionInfo hri : newRegions) {
        admin.assign(hri.getRegionName());

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      throws IOException {
        // Insert a mock for the connection used by the CatalogTracker.  Any
        // regionserver should do.  Use TESTUTIL.getConfiguration rather than
        // the conf from the master; the conf will already have an HConnection
        // associate so the below mocking of a connection will fail.
        HConnection connection =
          HConnectionTestingUtility.getMockedConnectionAndDecorate(TESTUTIL.getConfiguration(),
            rs0, rs0, rs0.getServerName(), HRegionInfo.FIRST_META_REGIONINFO);
        return new CatalogTracker(zk, conf, connection, abortable);
      }

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      throws IOException {
        // Insert a mock for the connection used by the CatalogTracker.   Use
        // TESTUTIL.getConfiguration rather than the conf from the master; the
        // conf will already have an HConnection associate so the below mocking
        // of a connection will fail.
        HConnection connection =
          HConnectionTestingUtility.getMockedConnectionAndDecorate(TESTUTIL.getConfiguration(),
            rs0, rs0, rs0.getServerName(), HRegionInfo.FIRST_META_REGIONINFO);
        return new CatalogTracker(zk, conf, connection, abortable);
      }

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      throws IOException {
        // Insert a mock for the connection used by the CatalogTracker.  Any
        // regionserver should do.  Use TESTUTIL.getConfiguration rather than
        // the conf from the master; the conf will already have an HConnection
        // associate so the below mocking of a connection will fail.
        HConnection connection =
          HConnectionTestingUtility.getMockedConnectionAndDecorate(TESTUTIL.getConfiguration(),
            rs0, rs0, rs0.getServerName(), HRegionInfo.FIRST_META_REGIONINFO);
        return new CatalogTracker(zk, conf, connection, abortable);
      }

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