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| Oracle Solaris Cluster Data Services Developer's Guide Oracle Solaris Cluster 4.1

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## Programming Interfaces

For writing data service code, the resource management architecture provides a low-level or base API, a higher-level library that is built on top of the base API, and Oracle Solaris Cluster Agent Builder, a tool that automatically generates a data service from basic input that you provide.

### Resource Management API

The Resource Management API (RMAPI) provides a set of low-level functions that enable a data service to access information about the resource types, resources, and resource groups in the system, to request a local restart or failover, and to set the resource status. You access these functions through the `libscha.so` library. The RMAPI provides these callback methods both in the form of shell commands and in the form of C functions. See the `scha_calls`(3HA) man page and Chapter 3, Resource Management API Reference for more information about the RMAPI functions. Also see Chapter 5, Sample Data Service for examples of how to use these functions in sample data service callback methods.

### Data Service Development Library

Built on top of the RMAPI is the Data Service Development Library (DSDL), which provides a higher-level integrated framework while retaining the underlying method-callback model of the RGM. The `libdsdev.so` library contains the DSDL functions.

The DSDL brings together various facilities for data service development, including the following:

- `libscha.so`. The low-level resource management APIs.

- PMF. The Process Monitor Facility (PMF), which provides a means of monitoring processes and their descendants, and restarting them if they die. See the `pmfadm`(1M) and `rpc.pmfd`(1M) man pages.

- `/usr/cluster/bin/hatimerun`. A facility for running programs under a timeout. See the `hatimerun`(1M) man page.

For the majority of applications, the DSDL provides most or all of the functionality you need to build a data service. Note, however, that the DSDL does not replace the low-level API but encapsulates and extends it. In fact, many DSDL functions call the `libscha.so` functions. Likewise, you can directly call `libscha.so` functions while using the DSDL to code the bulk of your data service.

See Chapter 6, Data Service Development Library and the `scha_calls`(3HA) man page for more information about the DSDL.

### Oracle Solaris Cluster Agent Builder

Agent Builder is a tool that automates the creation of a data service. You input basic information about the target application and the data service to be created. Agent Builder generates a data service, which includes GDS driver scripts or source and executable code (C or Korn shell) with a customized RTR file and an Oracle Solaris SVR4 package.

For most applications, you can use Agent Builder to generate a complete data service with only minor manual changes on your part. Applications with more sophisticated requirements, such as adding validation checks for additional properties, might require work that Agent Builder cannot do. However, even in these cases, you might be able to use Agent Builder to generate the bulk of the code and manually code the rest. At a minimum, you can use Agent Builder to generate the Oracle Solaris package for you.

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