org.apache.hc.core5.http.nio.support.classic

## Class AbstractClassicEntityProducer

- java.lang.Object
- - org.apache.hc.core5.http.nio.support.classic.AbstractClassicEntityProducer

- All Implemented Interfaces:
    EntityDetails, AsyncDataProducer, AsyncEntityProducer, ResourceHolder

      public abstract class AbstractClassicEntityProducer
      extends Object
      implements AsyncEntityProducer

  `AsyncEntityProducer` implementation that acts as a compatibility layer for classic `OutputStream` based interfaces. Blocking output processing is executed through an `Executor`.
  Since:
    5.0

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `AbstractClassicEntityProducer(int initialBufferSize, ContentType contentType, Executor executor)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `int` | `available()` Returns the number of bytes immediately available for output.
    `void` | `failed(Exception cause)` Triggered to signal a failure in data generation.
    `String` | `getContentEncoding()` Returns content encoding of the entity, if known.
    `long` | `getContentLength()` Returns length of the entity, if known.
    `String` | `getContentType()` Returns content type of the entity, if known.
    `Exception` | `getException()`
    `Set<String>` | `getTrailerNames()` Preliminary declaration of trailing headers.
    `boolean` | `isChunked()` Returns chunked transfer hint for this entity.
    `boolean` | `isRepeatable()` Determines whether the producer can consistently produce the same content after invocation of `ResourceHolder.releaseResources()`.
    `void` | `produce(DataStreamChannel channel)` Triggered to signal the ability of the underlying data channel to accept more data.
    `protected abstract void` | `produceData(ContentType contentType, OutputStream outputStream)` Writes out entity data into the given stream.
    `void` | `releaseResources()`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### AbstractClassicEntityProducer

          public AbstractClassicEntityProducer(int initialBufferSize,
                                       ContentType contentType,
                                       Executor executor)

  - ### Method Detail

    - #### produceData

          protected abstract void produceData(ContentType contentType,
                         OutputStream outputStream)
                                       throws IOException

      Writes out entity data into the given stream.
      Parameters:
        `contentType` - the entity content type
        `outputStream` - the output stream
      Throws:
        `IOException`

    - #### isRepeatable

          public final boolean isRepeatable()

      Description copied from interface: `AsyncEntityProducer`
      Determines whether the producer can consistently produce the same content after invocation of `ResourceHolder.releaseResources()`.
      Specified by:
        `isRepeatable` in interface `AsyncEntityProducer`

    - #### available

          public final int available()

      Description copied from interface: `AsyncDataProducer`
      Returns the number of bytes immediately available for output. This method can be used as a hint to control output events of the underlying I/O session.
      Specified by:
        `available` in interface `AsyncDataProducer`
      Returns:
        the number of bytes immediately available for output

    - #### produce

          public final void produce(DataStreamChannel channel)
                             throws IOException

      Description copied from interface: `AsyncDataProducer`
      Triggered to signal the ability of the underlying data channel to accept more data. The data producer can choose to write data immediately inside the call or asynchronously at some later point.
      Specified by:
        `produce` in interface `AsyncDataProducer`
      Parameters:
        `channel` - the data channel capable to accepting more data.
      Throws:
        `IOException`

    - #### getContentLength

          public final long getContentLength()

      Description copied from interface: `EntityDetails`
      Returns length of the entity, if known.
      Specified by:
        `getContentLength` in interface `EntityDetails`

    - #### getContentType

          public final String getContentType()

      Description copied from interface: `EntityDetails`
      Returns content type of the entity, if known.
      Specified by:
        `getContentType` in interface `EntityDetails`

    - #### getContentEncoding

          public String getContentEncoding()

      Description copied from interface: `EntityDetails`
      Returns content encoding of the entity, if known.
      Specified by:
        `getContentEncoding` in interface `EntityDetails`

    - #### isChunked

          public final boolean isChunked()

      Description copied from interface: `EntityDetails`
      Returns chunked transfer hint for this entity.

      The behavior of wrapping entities is implementation dependent, but should respect the primary purpose.

      Specified by:
        `isChunked` in interface `EntityDetails`

    - #### getTrailerNames

          public final Set<String> getTrailerNames()

      Description copied from interface: `EntityDetails`
      Preliminary declaration of trailing headers.
      Specified by:
        `getTrailerNames` in interface `EntityDetails`

    - #### failed

          public final void failed(Exception cause)

      Description copied from interface: `AsyncEntityProducer`
      Triggered to signal a failure in data generation.
      Specified by:
        `failed` in interface `AsyncEntityProducer`
      Parameters:
        `cause` - the cause of the failure.

    - #### getException

          public final Exception getException()

    - #### releaseResources

          public void releaseResources()

      Specified by:
        `releaseResources` in interface `ResourceHolder`

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