ISAMJ
The LegacyJ ISAMJ product connects Java technology with the ISAM interface. ISAM is defined for native code (primarily in C); a bridge is necessary to connect Java to the native code. Connectivity is provided through JNI (Java Native Interface), allowing Java code to access ISAM as if it were just another Java API. ISAMJ enables the original native code ISAM to execute and access the original ISAM data.
ISAMJ is distributed in two parts: the Java component and the JNI native component. The Java component is common regardless of platform. The Java interfaces and Java classes are accessed on any supported platform.
ISAMJ Java
The ISAMJ Java side has two interface layers, a low-level and a high-level interface. The low-level interface closely matches the original ISAM specification, including functions such as isaddindex and iserase. The high-level interface more closely resembles existing Java API's, encapsulating the ISAM function in a more object-oriented framework; classes such as ISAMFile extends File and ISAMRecord which may be extended by user record classes.
The low-level functionality is encompassed within the ISAM and ISAMConstants classes.
The high-level functionality is encompassed within the ISAMFile, ISAMRecord, ISAMKey, ISAMAudHead, ISAMDictInfo and ISAMConstants classes.
ISAMJ Native
The ISAMJ native component implements a JNI interface used by the Java and accesses a native code shared library which implements the ISAM functionality. Java native code must be in shared library/shared object form (.DLL in Windows). The ISAMJ native component accesses this shared library, passing requests and data from Java to the native ISAM driver.
The native ISAM drivers tested include D-ISAM and ObjecTrieve; of these two, only D-ISAM provides variable length as well as fixed length functionality.
ISAMJ Deliverables
ISAMJ includes the high- and low-level functionality .class files (Java executables). ISAMJ also includes the native isamj.dll or libisamj.so connector components. This connector component is unique to each platform, currently available for Windows and Solaris; other platforms are available upon request.
ISAMJ Dependencies
ISAMJ does not include ISAM functionality itself; this must be provided by a third party (such as Byte Designs D-ISAM). File created and accessed using ISAMJ may be created and accessed using Java programs, while the data is in the original binary datafile format.
ISAMJ includes the JavaDoc documentation of the classes, the format most used for Java class documentation and most familiar to Java programmers.
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