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

org.apache.hadoop.hbase.client.HTablePool
A simple pool of HTable instances. Each HTablePool acts as a pool for all tables. To use, instantiate an HTablePool and use {@link #getTable(String)} to get an HTable from the pool.This method is not needed anymore, clients should call HTableInterface.close() rather than returning the tables to the pool Once you are done with it, close your instance of {@link HTableInterface}by calling {@link HTableInterface#close()} rather than returning the tablesto the pool with (deprecated) {@link #putTable(HTableInterface)}.
A pool can be created with a maxSize which defines the most HTable references that will ever be retained for each table. Otherwise the default is {@link Integer#MAX_VALUE}.
Pool will manage its own connections to the cluster. See {@link HConnectionManager}. @deprecated Use {@link HConnection#getTable(String)} instead.

        } else {
          delete.deleteFamily(split[0]);
        }
      }
    }
    HTablePool pool = servlet.getTablePool();
    HTableInterface table = null;
    try {
      table = pool.getTable(tableResource.getName());
      table.delete(delete);
      servlet.getMetrics().incrementSucessfulDeleteRequests(1);
      if (LOG.isDebugEnabled()) {
        LOG.debug("DELETE " + delete.toString());
      }

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   *
   * @param model instance of CellSetModel
   * @return Response 200 OK, 304 Not modified, 400 Bad request
   */
  Response checkAndPut(final CellSetModel model) {
    HTablePool pool = servlet.getTablePool();
    HTableInterface table = null;
    try {
      if (model.getRows().size() != 1) {
        return Response.status(Response.Status.BAD_REQUEST)
          .type(MIMETYPE_TEXT).entity("Bad request" + CRLF)
          .build();
      }


      RowModel rowModel = model.getRows().get(0);
      byte[] key = rowModel.getKey();
      if (key == null) {
        key = rowspec.getRow();
      }


      List<CellModel> cellModels = rowModel.getCells();
      int cellModelCount = cellModels.size();
      if (key == null || cellModelCount <= 1) {
        return Response.status(Response.Status.BAD_REQUEST)
          .type(MIMETYPE_TEXT).entity("Bad request" + CRLF)
          .build();
      }


      Put put = new Put(key);
      CellModel valueToCheckCell = cellModels.get(cellModelCount - 1);
      byte[] valueToCheckColumn = valueToCheckCell.getColumn();
      byte[][] valueToPutParts = KeyValue.parseColumn(valueToCheckColumn);
      if (valueToPutParts.length == 2 && valueToPutParts[1].length > 0) {
        CellModel valueToPutCell = null;
        for (int i = 0, n = cellModelCount - 1; i < n ; i++) {
          if(Bytes.equals(cellModels.get(i).getColumn(),
              valueToCheckCell.getColumn())) {
            valueToPutCell = cellModels.get(i);
            break;
          }
        }
        if (valueToPutCell != null) {
          put.add(valueToPutParts[0], valueToPutParts[1], valueToPutCell
            .getTimestamp(), valueToPutCell.getValue());
        } else {
          return Response.status(Response.Status.BAD_REQUEST)
            .type(MIMETYPE_TEXT).entity("Bad request" + CRLF)
            .build();
        }
      } else {
        return Response.status(Response.Status.BAD_REQUEST)
          .type(MIMETYPE_TEXT).entity("Bad request" + CRLF)
          .build();
      }


      table = pool.getTable(this.tableResource.getName());
      boolean retValue = table.checkAndPut(key, valueToPutParts[0],
        valueToPutParts[1], valueToCheckCell.getValue(), put);
      if (LOG.isDebugEnabled()) {
        LOG.debug("CHECK-AND-PUT " + put.toString() + ", returns " + retValue);
      }

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   *
   * @param model instance of CellSetModel
   * @return Response 200 OK, 304 Not modified, 400 Bad request
   */
  Response checkAndDelete(final CellSetModel model) {
    HTablePool pool = servlet.getTablePool();
    HTableInterface table = null;
    Delete delete = null;
    try {
      if (model.getRows().size() != 1) {
        return Response.status(Response.Status.BAD_REQUEST)
          .type(MIMETYPE_TEXT).entity("Bad request" + CRLF)
          .build();
      }
      RowModel rowModel = model.getRows().get(0);
      byte[] key = rowModel.getKey();
      if (key == null) {
        key = rowspec.getRow();
      }
      if (key == null) {
        return Response.status(Response.Status.BAD_REQUEST)
          .type(MIMETYPE_TEXT).entity("Bad request" + CRLF)
          .build();
      }


      delete = new Delete(key);
      CellModel valueToDeleteCell = rowModel.getCells().get(0);
      byte[] valueToDeleteColumn = valueToDeleteCell.getColumn();
      if (valueToDeleteColumn == null) {
        try {
          valueToDeleteColumn = rowspec.getColumns()[0];
        } catch (final ArrayIndexOutOfBoundsException e) {
          return Response.status(Response.Status.BAD_REQUEST)
            .type(MIMETYPE_TEXT).entity("Bad request" + CRLF)
            .build();
        }
      }
      byte[][] parts = KeyValue.parseColumn(valueToDeleteColumn);
      if (parts.length == 2 && parts[1].length > 0) {
        delete.deleteColumns(parts[0], parts[1]);
      } else {
        return Response.status(Response.Status.BAD_REQUEST)
          .type(MIMETYPE_TEXT).entity("Bad request" + CRLF)
          .build();
      }


      table = pool.getTable(tableResource.getName());
      boolean retValue = table.checkAndDelete(key, parts[0], parts[1],
        valueToDeleteCell.getValue(), delete);
      if (LOG.isDebugEnabled()) {
        LOG.debug("CHECK-AND-DELETE " + delete.toString() + ", returns "
          + retValue);

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    this.tableResource = tableResource;
  }


  private HTableDescriptor getTableSchema() throws IOException,
      TableNotFoundException {
    HTablePool pool = servlet.getTablePool();
    HTableInterface table = pool.getTable(tableResource.getName());
    try {
      return table.getTableDescriptor();
    } finally {
      table.close();
    }

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   * @param conf existing configuration
   * @throws IOException.
   */
  RESTServlet(Configuration conf) throws IOException {
    this.conf = conf;
    this.pool = new HTablePool(conf, 10);
    this.admin = new HBaseAdmin(conf);
  }

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  private Iterator<KeyValue> valuesI;
  private KeyValue cache;


  public RowResultGenerator(final String tableName, final RowSpec rowspec,
      final Filter filter) throws IllegalArgumentException, IOException {
    HTablePool pool = RESTServlet.getInstance().getTablePool(); 
    HTableInterface table = pool.getTable(tableName);
    try {
      Get get = new Get(rowspec.getRow());
      if (rowspec.hasColumns()) {
        for (byte[] col: rowspec.getColumns()) {
          byte[][] split = KeyValue.parseColumn(col);
          if (split.length == 2 && split[1].length != 0) {
            get.addColumn(split[0], split[1]);
          } else {
            get.addFamily(split[0]);
          }
        }
      } else {
        // rowspec does not explicitly specify columns, return them all
        for (HColumnDescriptor family: 
            table.getTableDescriptor().getFamilies()) {
          get.addFamily(family.getName());
        }
      }
      get.setTimeRange(rowspec.getStartTime(), rowspec.getEndTime());
      get.setMaxVersions(rowspec.getMaxVersions());
      if (filter != null) {
        get.setFilter(filter);
      }
      Result result = table.get(get);
      if (result != null && !result.isEmpty()) {
        valuesI = result.list().iterator();
      }
    } finally {
      pool.putTable(table);
    }
  }

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    this.tableResource = tableResource;
  }


  private Map<HRegionInfo,HServerAddress> getTableRegions()
      throws IOException {
    HTablePool pool = servlet.getTablePool();
    HTableInterface table = pool.getTable(tableResource.getName());
    try {
      return ((HTable)table).getRegionsInfo();
    } finally {
      table.close();
    }

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                  Response.Status.SERVICE_UNAVAILABLE);
    }
  }


  private Response update(CellSetModel model, boolean replace) {
    HTablePool pool;
    try {
      pool = RESTServlet.getInstance().getTablePool();
    } catch (IOException e) {
      throw new WebApplicationException(e, 
                  Response.Status.INTERNAL_SERVER_ERROR);
    }
    HTable table = null;
    try {
      table = pool.getTable(this.table);
      for (RowModel row: model.getRows()) {
        Put put = new Put(row.getKey());
        for (CellModel cell: row.getCells()) {
          byte [][] parts = KeyValue.parseColumn(cell.getColumn());
          if (cell.hasUserTimestamp()) {
            put.add(parts[0], parts[1], cell.getTimestamp(), cell.getValue());
          } else {
            put.add(parts[0], parts[1], cell.getValue());
          }
        }
        table.put(put);
        if (LOG.isDebugEnabled()) {
          LOG.debug("PUT " + put.toString());
        }
      }
      table.flushCommits();
      ResponseBuilder response = Response.ok();
      return response.build();
    } catch (IOException e) {
      throw new WebApplicationException(e,
                  Response.Status.SERVICE_UNAVAILABLE);
    } finally {
      if (table != null) {
        pool.putTable(table);
      }
    }
  }

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    }
  }


  private Response updateBinary(byte[] message, HttpHeaders headers, 
      boolean replace) {
    HTablePool pool;
    try {
      pool = RESTServlet.getInstance().getTablePool();
    } catch (IOException e) {
      throw new WebApplicationException(e, 
                  Response.Status.INTERNAL_SERVER_ERROR);
    }
    HTable table = null;    
    try {
      byte[] row = rowspec.getRow();
      byte[][] columns = rowspec.getColumns();
      byte[] column = null;
      if (columns != null) {
        column = columns[0];
      }
      long timestamp = -1;
      List<String> vals = headers.getRequestHeader("X-Row");
      if (vals != null && !vals.isEmpty()) {
        row = Bytes.toBytes(vals.get(0));
      }
      vals = headers.getRequestHeader("X-Column");
      if (vals != null && !vals.isEmpty()) {
        column = Bytes.toBytes(vals.get(0));
      }
      vals = headers.getRequestHeader("X-Timestamp");
      if (vals != null && !vals.isEmpty()) {
        timestamp = Long.valueOf(vals.get(0));
      }
      if (column == null) {
        throw new WebApplicationException(Response.Status.BAD_REQUEST);
      }
      Put put = new Put(row);
      byte parts[][] = KeyValue.parseColumn(column);
      if (timestamp >= 0) {
        put.add(parts[0], parts[1], timestamp, message);
      } else {
        put.add(parts[0], parts[1], message);
      }
      table = pool.getTable(this.table);
      table.put(put);
      if (LOG.isDebugEnabled()) {
        LOG.debug("PUT " + put.toString());
      }
      table.flushCommits();
      return Response.ok().build();
    } catch (IOException e) {
      throw new WebApplicationException(e,
                  Response.Status.SERVICE_UNAVAILABLE);
    } finally {
      if (table != null) {
        pool.putTable(table);
      }
    }
  }

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        delete.deleteColumns(split[0], split[1], rowspec.getTimestamp());
      } else {
        delete.deleteColumns(split[0], split[1]);        
      }
    }
    HTablePool pool;
    try {
      pool = RESTServlet.getInstance().getTablePool();
    } catch (IOException e) {
      throw new WebApplicationException(e, 
                  Response.Status.INTERNAL_SERVER_ERROR);
    }
    HTable table = null;
    try {
      table = pool.getTable(this.table);
      table.delete(delete);
      if (LOG.isDebugEnabled()) {
        LOG.debug("DELETE " + delete.toString());
      }
      table.flushCommits();
    } catch (IOException e) {
      throw new WebApplicationException(e, 
                  Response.Status.SERVICE_UNAVAILABLE);
    } finally {
      if (table != null) {
        pool.putTable(table);
      }
    }
    return Response.ok().build();
  }

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