Package org.apache.nutch.indexer

## Interface IndexWriter

- All Superinterfaces:
    `Configurable`, `Pluggable`
  All Known Implementing Classes:
    `CloudSearchIndexWriter`, `CSVIndexWriter`, `DummyIndexWriter`, `ElasticIndexWriter`, `KafkaIndexWriter`, `RabbitIndexWriter`, `SolrIndexWriter`

      public interface IndexWriter
      extends Pluggable, Configurable

- - ### Field Summary

    Fields
    Modifier and Type | Field | Description
    --- | --- | ---
    `static String` | `X_POINT_ID` | The name of the extension point.

  - ### Method Summary

    All Methods Instance Methods Abstract Methods Deprecated Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | `close()` |
    `void` | `commit()` |
    `void` | `delete​(String key)` |
    `Map<String,​Map.Entry<String,​Object>>` | `describe()` | Returns `Map` with the specific parameters the IndexWriter instance can take.
    `void` | `open​(Configuration conf, String name)` | Deprecated. use `open(IndexWriterParams)`} instead.
    `void` | `open​(IndexWriterParams parameters)` | Initializes the internal variables from a given index writer configuration.
    `void` | `update​(NutchDocument doc)` |
    `void` | `write​(NutchDocument doc)` |

    - ### Methods inherited from interface org.apache.hadoop.conf.Configurable

      `getConf, setConf`

- - ### Field Detail

    - #### X_POINT_ID

          static final String X_POINT_ID

      The name of the extension point.

  - ### Method Detail

    - #### open

          @Deprecated
          void open​(Configuration conf,
                    String name)
             throws IOException

      Deprecated.
      use `open(IndexWriterParams)`} instead.
      Parameters:
        `conf` - Nutch configuration
        `name` - target name of the `IndexWriter` to be opened
      Throws:
        `IOException` - Some exception thrown by some writer.

    - #### open

          void open​(IndexWriterParams parameters)
             throws IOException

      Initializes the internal variables from a given index writer configuration.
      Parameters:
        `parameters` - Params from the index writer configuration.
      Throws:
        `IOException` - Some exception thrown by writer.

    - #### write

          void write​(NutchDocument doc)
              throws IOException

      Throws:
        `IOException`

    - #### delete

          void delete​(String key)
               throws IOException

      Throws:
        `IOException`

    - #### update

          void update​(NutchDocument doc)
               throws IOException

      Throws:
        `IOException`

    - #### commit

          void commit()
               throws IOException

      Throws:
        `IOException`

    - #### close

          void close()
              throws IOException

      Throws:
        `IOException`

    - #### describe

          Map<String,​Map.Entry<String,​Object>> describe()

      Returns `Map` with the specific parameters the IndexWriter instance can take.
      Returns:
        The values of each row. It must have the form <KEY,<DESCRIPTION,VALUE>>.