Examples of org.hbase.async.Scanner$Response

org.hbase.async.Scanner
Wraps the RPC response for scan requests from HBase 0.95+. When de-serializing a response to a "Scan" RPC from HBase 0.95+ we create this temporarily object at the time of the de-serialization of the RPC so that our callback can access a few more fields along with the actual payload of the response.

    final byte[] end_row = 
      Arrays.copyOfRange(Bytes.fromLong(end_id), 8 - metric_width, 8);


    LOG.debug("[" + thread_id + "] Start row: " + UniqueId.uidToString(start_row));
    LOG.debug("[" + thread_id + "] End row: " + UniqueId.uidToString(end_row));
    final Scanner scanner = tsdb.getClient().newScanner(tsdb.metaTable());
    scanner.setStartKey(start_row);
    scanner.setStopKey(end_row);
    scanner.setFamily("name".getBytes(CHARSET));
    scanner.setQualifier("ts_meta".getBytes(CHARSET));
    return scanner;
  }

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    final byte[] end_row = 
      Arrays.copyOfRange(Bytes.fromLong(end_id), 8 - metric_width, 8);


    LOG.debug("[" + thread_id + "] Start row: " + UniqueId.uidToString(start_row));
    LOG.debug("[" + thread_id + "] End row: " + UniqueId.uidToString(end_row));
    final Scanner scanner = tsdb.getClient().newScanner(tsdb.dataTable());
    scanner.setStartKey(start_row);
    scanner.setStopKey(end_row);
    scanner.setFamily("t".getBytes(Charset.forName("ISO-8859-1")));
    return scanner;
  }

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    // scan all of the rows starting with the tree ID. We can't just delete the
    // rows as there may be other types of data. Thus we have to check the
    // qualifiers of every column to see if it's safe to delete
    final byte[] start = idToBytes(tree_id);
    final byte[] end = idToBytes(tree_id + 1);
    final Scanner scanner = tsdb.getClient().newScanner(tsdb.treeTable());
    scanner.setStartKey(start);
    scanner.setStopKey(end);   
    scanner.setFamily(TREE_FAMILY);
    
    final Deferred<Boolean> completed = new Deferred<Boolean>();
    
    /**
     * Scanner callback that loops through all rows between tree id and 
     * tree id++ searching for tree related columns to delete.
     */
    final class DeleteTreeScanner implements Callback<Deferred<Boolean>, 
      ArrayList<ArrayList<KeyValue>>> {
  
      // list where we'll store delete requests for waiting on
      private final ArrayList<Deferred<Object>> delete_deferreds = 
        new ArrayList<Deferred<Object>>();
      
      /**
       * Fetches the next set of rows from the scanner and adds this class as
       * a callback
       * @return The list of delete requests when the scanner returns a null set
       */
      public Deferred<Boolean> deleteTree() {
        return scanner.nextRows().addCallbackDeferring(this);
      }
      
      @Override
      public Deferred<Boolean> call(ArrayList<ArrayList<KeyValue>> rows)
          throws Exception {

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  private static Scanner setupAllTreeScanner(final TSDB tsdb) {
    final byte[] start = new byte[TREE_ID_WIDTH];
    final byte[] end = new byte[TREE_ID_WIDTH];
    Arrays.fill(end, (byte)0xFF);
    
    final Scanner scanner = tsdb.getClient().newScanner(tsdb.treeTable());
    scanner.setStartKey(start);
    scanner.setStopKey(end);   
    scanner.setFamily(TREE_FAMILY);
    
    // set the filter to match only on TREE_ID_WIDTH row keys
    final StringBuilder buf = new StringBuilder(20);
    buf.append("(?s)"  // Ensure we use the DOTALL flag.
        + "^\\Q");
    buf.append("\\E(?:.{").append(TREE_ID_WIDTH).append("})$");
    scanner.setKeyRegexp(buf.toString(), CHARSET);
    return scanner;
  }

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    final ArrayList<Query> queries = new ArrayList<Query>();
    CliQuery.parseCommandLineQuery(args, tsdb, queries, null, null);


    final StringBuilder buf = new StringBuilder();
    for (final Query query : queries) {
      final Scanner scanner = Internal.getScanner(query);
      ArrayList<ArrayList<KeyValue>> rows;
      while ((rows = scanner.nextRows().joinUninterruptibly()) != null) {
        for (final ArrayList<KeyValue> row : rows) {
          buf.setLength(0);
          final byte[] key = row.get(0).key();
          final long base_time = Internal.baseTime(tsdb, key);
          final String metric = Internal.metricName(tsdb, key);

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  @PrepareForTest({HBaseClient.class, Scanner.class})
  @Test
  public void suggestWithNoMatch() {
    uid = new UniqueId(client, table, kind, 3);


    final Scanner fake_scanner = mock(Scanner.class);
    when(client.newScanner(table))
      .thenReturn(fake_scanner);


    when(fake_scanner.nextRows())
      .thenReturn(Deferred.<ArrayList<ArrayList<KeyValue>>>fromResult(null));
    // Watch this! ______,^   I'm writing C++ in Java!


    final List<String> suggestions = uid.suggest("nomatch");
    assertEquals(0, suggestions.size());  // No results.

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  @PrepareForTest({HBaseClient.class, Scanner.class})
  @Test
  public void suggestWithMatches() {
    uid = new UniqueId(client, table, kind, 3);


    final Scanner fake_scanner = mock(Scanner.class);
    when(client.newScanner(table))
      .thenReturn(fake_scanner);


    final ArrayList<ArrayList<KeyValue>> rows = new ArrayList<ArrayList<KeyValue>>(2);
    final byte[] foo_bar_id = { 0, 0, 1 };
    {
      ArrayList<KeyValue> row = new ArrayList<KeyValue>(1);
      row.add(new KeyValue("foo.bar".getBytes(), ID, kind_array, foo_bar_id));
      rows.add(row);
      row = new ArrayList<KeyValue>(1);
      row.add(new KeyValue("foo.baz".getBytes(), ID, kind_array,
                           new byte[] { 0, 0, 2 }));
      rows.add(row);
    }
    when(fake_scanner.nextRows())
      .thenReturn(Deferred.<ArrayList<ArrayList<KeyValue>>>fromResult(rows))
      .thenReturn(Deferred.<ArrayList<ArrayList<KeyValue>>>fromResult(null));
    // Watch this! ______,^   I'm writing C++ in Java!


    final List<String> suggestions = uid.suggest("foo");

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    }
  }


  static List<Deferred<Boolean>> doList(HBaseClient client)
      throws Throwable {
    final Scanner scanner = client.newScanner(TABLE_NAME);
    scanner.setFamily(INFO_FAM);
    scanner.setQualifier(PASSWORD_COL);


    ArrayList<ArrayList<KeyValue>> rows = null;
    ArrayList<Deferred<Boolean>> workers
      = new ArrayList<Deferred<Boolean>>();
    while ((rows = scanner.nextRows(1).joinUninterruptibly()) != null) {
      LOG.info("received a page of users.");
      for (ArrayList<KeyValue> row : rows) {
        KeyValue kv = row.get(0);
        byte[] expected = kv.value();
        String userId = new String(kv.key());

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