The Tamino API for Java, in common with the other Tamino APIs, communicates with the Tamino XML Server via an HTTP API through a web server. With this release of Tamino XML Server 4.1, a Tamino database can now also be accessed without a web server through the Tamino API for Java. This is achieved by the plug-in architecture of the API providing access the webserverless base C API.
The distinction, whether the Tamino API for Java should access the
Tamino XML Server via the web server or without the
web server, is done using the protocol tag in the URL. For example, if a
database can be accessed via http://localhost/tamino/mydb/, a URL
such as wsl:///tamino/mydb/ would access the same database without
going through the web server. When opening a connection to a Tamino database
using the webserverless mode via the call
TConnectionFactory.getInstance().newConnection( DB_URI
), the variable DB_URI must specify
the protocol wsl instead of
http, e.g. wsl:///tamino/mydb. Since all
connections via WSL have to use the eXtended Transport Services (XTS) from
Software AG, the hostname and the portnumber are left blank in the URL and the
database is accessed through its unique database name, as in the above example
mydb. This is the only change required when the
webserverless mode is to be used, i.e. to replace the protocol in all
DB_URIs by wsl and
leave out the hostname and the portnumber.
In order to use the correct XTS server, which knows about the desired
database, either set the environment variable
XTSDSURL locally or adjust the entry in the file
/etc/hosts. The latter is normally done automatically when
the XTS package is installed.
In order to use the webserverless mode of the Tamino API for Java, the following points must be considered:
The directory containing the library modwsl.dll
must be in the path. This is usually done at installation time by adding the
variable %SAG_COMMON% to the
path variable.
The directory containing the library
libmodwsl.so must be added to the environment variable
LD_LIBRARY_PATH. This is usually done by calling
the setup script /opt/sag/sagenv.new.
The option
-Djava.protocol.handler.pkgs=com.softwareag.tamino.db.protocols
must be supplied at startup to the Java application, i.e. to the JVM.
The webserverless mode requires that the Software AG product XTS is installed. It can e.g. be found on the Tamino XML Server distribution media.
In order to ensure that a particular database can only be accessed through a particular webserver (or webserverless client), one defines the webserver using the Web Server Management object in the tree-view frame of the System Management Hub. This webserver can then be assigned to a particular database via the Web Servers object in the tree-view frame.
Since the webserverless mode does not require a web server to access Tamino, the application should not use direct HTTP calls to communicate with Tamino databases; it should only use methods provided by the Tamino API for Java.
Only databases of a Tamino XML Server with a version number of 4.1 or higher can be accessed via the webserverless mode.