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For the most part, the Jasig CAS Client for Java works fine in a distributed environment without additional configuration. However, in certain scenarios, such as when PGTIOUs are involved, additional support is needed.

As of Jasig CAS Client 3.1.9, support for a distributed ProxyGrantingTicketStorage has been implemented.

Including the Dependency

Instead of configuring the "cas-client-core" as a dependency within your project, include the following:

or

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The memcached client is not available in the public repositories so it must be downloaded manually from http://code.google.com/p/spymemcached/

Configuring the Validation Filter

Configure the validation filter as usual. You'll note, that as of 3.1.9, there is one additional optional property: proxyGrantingTicketStorageClass

This property should be defined as: org.jasig.cas.client.proxy.EhcacheBackedProxyGrantingTicketStorageImpl for the Ehcache version or
org.jasig.cas.client.proxy.MemcachedBackedProxyGrantingTicketStorageImpl for the Memcached version.

That would mean:

or

In either instance, the CAS Client will use the no-arg constructor to instantiate the class. It relies on a separate configuration file. The next section will provide more details on that.

Configuring the EhCache

When loading from the web.xml, the Jasig CAS Client relies on a series of default values, one of which being that the cache must be configured in the default location (i.e. classpath:ehcache.xml). For those who need more fine-grained control, they should look at the Spring Configuration options.

Configuring the Memcached Servers

When loading from the web.xml, the Jasig CAS Client relies on a series of default values, one of which being that the list of memcached servers must be defined in "/cas/casclient_memcached_hosts.txt" on the classpath). For those who need more fine-grained control, they should look at the Spring Configuration options.

The file is a simple list of <hostname>:<ports> on separate lines. BE SURE NOT TO HAVE EXTRA LINE BREAKS.

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2 Comments

  1. What does PGTIOU stand for?

  2. I believe it's "Proxy Granting Ticket IOU"