Module java.base
Package javax.net.ssl

## Class SSLEngineResult

- java.lang.Object
- - javax.net.ssl.SSLEngineResult

-     public class SSLEngineResult
      extends Object

  An encapsulation of the result state produced by `SSLEngine` I/O calls.

  A `SSLEngine` provides a means for establishing secure communication sessions between two peers. `SSLEngine` operations typically consume bytes from an input buffer and produce bytes in an output buffer. This class provides operational result values describing the state of the `SSLEngine`, including indications of what operations are needed to finish an ongoing handshake. Lastly, it reports the number of bytes consumed and produced as a result of this operation.

  Since:
    1.5
  See Also:
    `SSLEngine`, `SSLEngine.wrap(ByteBuffer, ByteBuffer)`, `SSLEngine.unwrap(ByteBuffer, ByteBuffer)`

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class | Description
    --- | --- | ---
    `static class` | `SSLEngineResult.HandshakeStatus` | An `SSLEngineResult` enum describing the current handshaking state of this `SSLEngine`.
    `static class` | `SSLEngineResult.Status` | An `SSLEngineResult` enum describing the overall result of the `SSLEngine` operation.

  - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `SSLEngineResult​(SSLEngineResult.Status status, SSLEngineResult.HandshakeStatus handshakeStatus, int bytesConsumed, int bytesProduced)` | Initializes a new instance of this class.
    `SSLEngineResult​(SSLEngineResult.Status status, SSLEngineResult.HandshakeStatus handshakeStatus, int bytesConsumed, int bytesProduced, long sequenceNumber)` | Initializes a new instance of this class.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `int` | `bytesConsumed()` | Returns the number of bytes consumed from the input buffer.
    `int` | `bytesProduced()` | Returns the number of bytes written to the output buffer.
    `SSLEngineResult.HandshakeStatus` | `getHandshakeStatus()` | Gets the handshake status of this `SSLEngine` operation.
    `SSLEngineResult.Status` | `getStatus()` | Gets the return value of this `SSLEngine` operation.
    `long` | `sequenceNumber()` | Returns the sequence number of the produced or consumed SSL/TLS/DTLS record (optional operation).
    `String` | `toString()` | Returns a String representation of this object.

    - ### Methods declared in class java.lang.Object

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

- - ### Constructor Detail

    - #### SSLEngineResult

          public SSLEngineResult​(SSLEngineResult.Status status,
                                 SSLEngineResult.HandshakeStatus handshakeStatus,
                                 int bytesConsumed,
                                 int bytesProduced)

      Initializes a new instance of this class.
      Parameters:
        `status` - the return value of the operation.
        `handshakeStatus` - the current handshaking status.
        `bytesConsumed` - the number of bytes consumed from the source ByteBuffer
        `bytesProduced` - the number of bytes placed into the destination ByteBuffer
      Throws:
        `IllegalArgumentException` - if the `status` or `handshakeStatus` arguments are null, or if `bytesConsumed` or `bytesProduced` is negative.

    - #### SSLEngineResult

          public SSLEngineResult​(SSLEngineResult.Status status,
                                 SSLEngineResult.HandshakeStatus handshakeStatus,
                                 int bytesConsumed,
                                 int bytesProduced,
                                 long sequenceNumber)

      Initializes a new instance of this class.
      Parameters:
        `status` - the return value of the operation.
        `handshakeStatus` - the current handshaking status.
        `bytesConsumed` - the number of bytes consumed from the source ByteBuffer
        `bytesProduced` - the number of bytes placed into the destination ByteBuffer
        `sequenceNumber` - the sequence number (unsigned long) of the produced or consumed SSL/TLS/DTLS record, or `-1L` if no record produced or consumed
      Throws:
        `IllegalArgumentException` - if the `status` or `handshakeStatus` arguments are null, or if `bytesConsumed` or `bytesProduced` is negative
      Since:
        9

  - ### Method Detail

    - #### getStatus

          public final SSLEngineResult.Status getStatus()

      Gets the return value of this `SSLEngine` operation.
      Returns:
        the return value

    - #### getHandshakeStatus

          public final SSLEngineResult.HandshakeStatus getHandshakeStatus()

      Gets the handshake status of this `SSLEngine` operation.
      Returns:
        the handshake status

    - #### bytesConsumed

          public final int bytesConsumed()

      Returns the number of bytes consumed from the input buffer.
      Returns:
        the number of bytes consumed.

    - #### bytesProduced

          public final int bytesProduced()

      Returns the number of bytes written to the output buffer.
      Returns:
        the number of bytes produced

    - #### sequenceNumber

          public final long sequenceNumber()

      Returns the sequence number of the produced or consumed SSL/TLS/DTLS record (optional operation).
      API Note:
        Note that sequence number is an unsigned long and cannot exceed `-1L`. It is desired to use the unsigned long comparing mode for comparison of unsigned long values (see also `Long.compareUnsigned()`).

        For DTLS protocols, the first 16 bits of the sequence number is a counter value (epoch) that is incremented on every cipher state change. The remaining 48 bits on the right side of the sequence number represents the sequence of the record, which is maintained separately for each epoch.

      Implementation Note:
        It is recommended that providers should never allow the sequence number incremented to `-1L`. If the sequence number is close to wrapping, renegotiate should be requested, otherwise the connection should be closed immediately. This should be carried on automatically by the underlying implementation.
      Returns:
        the sequence number of the produced or consumed SSL/TLS/DTLS record; or `-1L` if no record is produced or consumed, or this operation is not supported by the underlying provider
      Since:
        9
      See Also:
        `Long.compareUnsigned(long, long)`

    - #### toString

          public String toString()

      Returns a String representation of this object.
      Overrides:
        `toString` in class `Object`
      Returns:
        a string representation of the object.