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.

    cacheControl.setNoTransform(false);
  }


  private HTableDescriptor getTableSchema() throws IOException,
      TableNotFoundException {
    HTablePool pool = RESTServlet.getInstance().getTablePool();
    HTable table = pool.getTable(this.table);
    try {
      return table.getTableDescriptor();
    } finally {
      pool.putTable(table);
    }
  }

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public class RowResultGenerator extends ResultGenerator {
  private Iterator<KeyValue> valuesI;


  public RowResultGenerator(String tableName, RowSpec rowspec)
      throws IllegalArgumentException, IOException {
    HTablePool pool = RESTServlet.getInstance().getTablePool(); 
    HTable table = pool.getTable(tableName);
    try {
      Get get = new Get(rowspec.getRow());
      if (rowspec.hasColumns()) {
        get.addColumns(rowspec.getColumns());
      } 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());
      Result result = table.get(get);
      if (result != null && !result.isEmpty()) {
        valuesI = result.list().iterator();
      }
    } finally {
      pool.putTable(table);
    }
  }

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    cacheControl.setNoTransform(false);
  }


  private Map<HRegionInfo,HServerAddress> getTableRegions()
      throws IOException {
    HTablePool pool = RESTServlet.getInstance().getTablePool();
    HTable table = pool.getTable(this.table);
    try {
      return table.getRegionsInfo();
    } finally {
      pool.putTable(table);
    }
  }

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   * Constructor
   * @throws IOException
   */
  public RESTServlet() throws IOException {
    this.conf = new HBaseConfiguration();
    this.pool = new HTablePool(conf, 10);
  }

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  private ResultScanner scanner;
  private Result cached;


  public ScannerResultGenerator(String tableName, RowSpec rowspec)
      throws IllegalArgumentException, IOException {
    HTablePool pool = RESTServlet.getInstance().getTablePool(); 
    HTable table = pool.getTable(tableName);
    try {
      Scan scan;
      if (rowspec.hasEndRow()) {
        scan = new Scan(rowspec.getStartRow(), rowspec.getEndRow());
      } else {
        scan = new Scan(rowspec.getStartRow());
      }
      if (rowspec.hasColumns()) {
        scan.addColumns(rowspec.getColumns());
      } else {
        for (HColumnDescriptor family: 
            table.getTableDescriptor().getFamilies()) {
          scan.addFamily(family.getName());
        }
      }
      scan.setTimeRange(rowspec.getStartTime(), rowspec.getEndTime());          
      scan.setMaxVersions(rowspec.getMaxVersions());
      scanner = table.getScanner(scan);
      cached = null;
      id = Long.toString(System.currentTimeMillis()) +
             Integer.toHexString(scanner.hashCode());
    } finally {
      pool.putTable(table);
    }
  }

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    @Override
    protected void doStart() throws Exception {
        if (configuration == null) {
            configuration = HBaseConfiguration.create();
        }
        tablePool = new HTablePool(configuration, poolMaxSize);
    }

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  private ResultScanner scanner;
  private Result cached;


  public ScannerResultGenerator(String tableName, RowSpec rowspec)
      throws IllegalArgumentException, IOException {
    HTablePool pool = RESTServlet.getInstance().getTablePool(); 
    HTable table = pool.getTable(tableName);
    try {
      Scan scan;
      if (rowspec.hasEndRow()) {
        scan = new Scan(rowspec.getStartRow(), rowspec.getEndRow());
      } else {
        scan = new Scan(rowspec.getStartRow());
      }
      if (rowspec.hasColumns()) {
        byte[][] columns = rowspec.getColumns();
        for (byte[] column: columns) {
          byte[][] split = KeyValue.parseColumn(column);
          if (split[1] != null) {
            scan.addColumn(split[0], split[1]);
          } else {
            scan.addFamily(split[0]);
          }
        }
      } else {
        for (HColumnDescriptor family: 
            table.getTableDescriptor().getFamilies()) {
          scan.addFamily(family.getName());
        }
      }
      scan.setTimeRange(rowspec.getStartTime(), rowspec.getEndTime());          
      scan.setMaxVersions(rowspec.getMaxVersions());
      scanner = table.getScanner(scan);
      cached = null;
      id = Long.toString(System.currentTimeMillis()) +
             Integer.toHexString(scanner.hashCode());
    } finally {
      pool.putTable(table);
    }
  }

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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());
          put.add(parts[0], parts[1], cell.getTimestamp(), 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 = HConstants.LATEST_TIMESTAMP;
      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);
      put.add(parts[0], parts[1], timestamp, 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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        } else {
          delete.deleteFamily(split[0]);
        }
      }
    }
    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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