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LNK APIs
The LNK programming interface includes language-specific methods and objects that provide common functionality across multiple environments.
C API
The C API enables applications to invoke maps and to develop adapters to use with HCL Link.
Loading, running, and controlling maps
There are various methods you can use to load, run, and control maps when you use APIs with HCL Link.
Callbacks
An API application uses callback to receive logging messages on a per-map basis or for global logging based on HCL Link initialization.

LNK APIs
The LNK programming interface includes language-specific methods and objects that provide common functionality across multiple environments.
- Link programming interface overview
  The Link programming interface is an object-oriented approach that enables applications to invoke HCL Link maps, thus removing reliance on command lines.
- C API
  The C API enables applications to invoke maps and to develop adapters to use with HCL Link.
  - C API interface methods overview
    The map, card, and adapter object properties define the properties that can be set for each object. Use the C API interface methods to GET or SET the adapter object properties.
  - Object methods
  - Loading, running, and controlling maps
    There are various methods you can use to load, run, and control maps when you use APIs with HCL Link.
    - Loading and running maps
      Use the following methods to load specific maps, refresh maps when the maps have changed, and run maps.
    - Controlling and monitoring maps
      These methods allow map execution to be controlled from another thread and to report map progress.
    - Initialization and termination methods
      The following methods initialize the environment required for running maps and clean up the environment after the map run is complete.
    - Callbacks
      An API application uses callback to receive logging messages on a per-map basis or for global logging based on HCL Link initialization.
      - MPI_TRACE_CALLBACK_PROC
        An API application can use MPI_TRACE_CALLBACK_PROC to receive logging messages such as I/O operations and Resource Manager operations on a per- map instance basis.
      - MPI_LOGFNCALLBACK
        An API application can use MPI_LOGFNCALLBACK as a global process API callback. MPI_LOGFNCALLBACK it is registered during the HIP API initialization, and includes Connection Manager and Resource Registry logging. An API application can use both MPI_TRACE_CALLBACK_PROC and MPI_LOGFNCALLBACK in order to log HCL Link I/O, Resource Manager, Connection Manager operations and Resource Registry messages to a central logging facility.
    - C API examples
      The examples included with the C API are located in the following directory: install_dir\examples\dk\dtxpi\c
  - Custom adapters
    The custom adapters interface makes it possible for users to develop adapters with as much functionality as those provided with the product.
- Python API
  Use the Python API to create, edit, and run maps and schemas from a Python program. For details, see the documentation installed in install_dir/python/api/hip/docs/html/index.html. Examples of the Python API are installed in install_dir/python/api/examples. Documentation for the Python API examples is available in install_dir/python/api/docs/html/examples.html.
- Java API
  The Java API interfaces enable you to create, edit, and run maps and schemas from a Java™ program.
- Java Tools
  The Java™ Tools provide objects and JNI utilities that you can use to get information about your map instances.

Callbacks

An API application uses callback to receive logging messages on a per-map basis or for global logging based on HCL Link initialization.