Examples of org.hbase.async.GetRequest

org.hbase.async.GetRequest
Reads something from HBase.
A note on passing {@code byte} arrays in argument
None of the method that receive a {@code byte[]} in argument will copy it.For more info, please refer to the documentation of {@link HBaseRpc}.
A note on passing {@code String}s in argument
All strings are assumed to use the platform's default charset.

       * @return The results of the {@link #StoreUIDMeta} callback
       */
      @Override
      public Deferred<Boolean> call(final String name) throws Exception {


        final GetRequest get = new GetRequest(tsdb.uidTable(), 
            UniqueId.stringToUid(uid));
        get.family(FAMILY);
        get.qualifier((type.toString().toLowerCase() + "_meta").getBytes(CHARSET));
        
        // #2 deferred
        return tsdb.getClient().get(get)
          .addCallbackDeferring(new StoreUIDMeta());
      }

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            return Deferred.fromResult(meta);
          }
          
        }
        
        final GetRequest get = new GetRequest(tsdb.uidTable(), uid);
        get.family(FAMILY);
        get.qualifier((type.toString().toLowerCase() + "_meta").getBytes(CHARSET));
        return tsdb.getClient().get(get).addCallbackDeferring(new FetchMetaCB());
      }
    }
    
    // verify that the UID is still in the map before fetching from storage

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       * @return The results of the {@link #StoreUIDMeta} callback
       */
      @Override
      public Deferred<Boolean> call(final String name) throws Exception {


        final GetRequest get = new GetRequest(tsdb.uidTable(), 
            UniqueId.stringToUid(uid));
        get.family(FAMILY);
        get.qualifier((type.toString().toLowerCase() + "_meta").getBytes(CHARSET));
        
        // #2 deferred
        return tsdb.getClient().get(get)
          .addCallbackDeferring(new StoreUIDMeta());
      }

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    return scanner;
  }


  /** Returns the cell of the specified row key, using family:kind. */
  private Deferred<byte[]> hbaseGet(final byte[] key, final byte[] family) {
    final GetRequest get = new GetRequest(table, key);
    get.family(family).qualifier(kind);
    class GetCB implements Callback<byte[], ArrayList<KeyValue>> {
      public byte[] call(final ArrayList<KeyValue> row) {
        if (row == null || row.isEmpty()) {
          return null;
        }

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        return results;
      }
      
    }
    
    final GetRequest get = new GetRequest(tsdb.uidTable(), MAXID_ROW);
    get.family(ID_FAMILY);
    get.qualifiers(kinds);
    return tsdb.getClient().get(get).addCallback(new GetCB());
  }

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            return Deferred.fromResult(meta);
          }
          
        }
        
        final GetRequest get = new GetRequest(tsdb.uidTable(), uid);
        get.family(FAMILY);
        get.qualifier((type.toString().toLowerCase() + "_meta").getBytes(CHARSET));
        return tsdb.getClient().get(get).addCallbackDeferring(new FetchMetaCB());
      }

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      final byte[] branch_id, final String display_name) {


    final Leaf leaf = new Leaf();
    leaf.setDisplayName(display_name);
    
    final GetRequest get = new GetRequest(tsdb.treeTable(), branch_id);
    get.family(Tree.TREE_FAMILY());
    get.qualifier(leaf.columnQualifier());
    
    /**
     * Called with the results of the fetch from storage
     */
    final class GetCB implements Callback<Deferred<Leaf>, ArrayList<KeyValue>> {

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  // HBase operations helpers //
  // ------------------------ //


  /** Gets the entire given row from the data table. */
  final Deferred<ArrayList<KeyValue>> get(final byte[] key) {
    return client.get(new GetRequest(table, key));
  }

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    if (tree_id < 1 || tree_id > 65535) {
      throw new IllegalArgumentException("Invalid Tree ID");
    }


    // fetch the whole row
    final GetRequest get = new GetRequest(tsdb.treeTable(), idToBytes(tree_id));
    get.family(TREE_FAMILY);
    
    /**
     * Called from the GetRequest with results from storage. Loops through the
     * columns and loads the tree definition and rules
     */

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    final byte[] row_key = new byte[TREE_ID_WIDTH + 1];
    System.arraycopy(idToBytes(tree_id), 0, row_key, 0, TREE_ID_WIDTH);
    row_key[TREE_ID_WIDTH] = COLLISION_ROW_SUFFIX;
    
    final GetRequest get = new GetRequest(tsdb.treeTable(), row_key);
    get.family(TREE_FAMILY);
    
    // if the caller provided a list of TSUIDs, then we need to compile a list
    // of qualifiers so we only fetch those columns.
    if (tsuids != null && !tsuids.isEmpty()) {
      final byte[][] qualifiers = new byte[tsuids.size()][];
      int index = 0;
      for (String tsuid : tsuids) {
        final byte[] qualifier = new byte[COLLISION_PREFIX.length + 
                                          (tsuid.length() / 2)];
        System.arraycopy(COLLISION_PREFIX, 0, qualifier, 0, 
            COLLISION_PREFIX.length);
        final byte[] tsuid_bytes = UniqueId.stringToUid(tsuid);
        System.arraycopy(tsuid_bytes, 0, qualifier, COLLISION_PREFIX.length, 
            tsuid_bytes.length);
        qualifiers[index] = qualifier;
        index++;
      }
      get.qualifiers(qualifiers);
    }
    
    /**
     * Called after issuing the row get request to parse out the results and
     * compile the list of collisions.

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Related Classes of org.hbase.async.GetRequest

net.opentsdb.core.TSDB

net.opentsdb.meta.Annotation

net.opentsdb.meta.NameCB

net.opentsdb.meta.TSMeta

net.opentsdb.meta.UIDMeta

net.opentsdb.tools.UidManager

net.opentsdb.tree.Branch

net.opentsdb.tree.Leaf

net.opentsdb.tree.Tree

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Examples of org.hbase.async.GetRequest

A note on passing {@code byte} arrays in argument

A note on passing {@code String}s in argument

Related Classes of org.hbase.async.GetRequest