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3.4. Dynamic Reconfiguration

Dynamically changing the configuration of some options while the cache is running is supported, by programmatically obtaining the Configuration object from the running cache and changing values. E.g., 
   Configuration liveConfig = cache.getConfiguration();
   liveConfig.setLockAcquisitionTimeout(2000);
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A complete listing of which options may be changed dynamically is in the Section 12.2, “Configuration File Quick Reference” section. An org.jboss.cache.config.ConfigurationException will be thrown if you attempt to change a setting that is not dynamic.

3.4.1. Overriding the Configuration via the Option API
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The Option API allows you to override certain behaviors of the cache on a per invocation basis. This involves creating an instance of org.jboss.cache.config.Option , setting the options you wish to override on the Option object and passing it in the InvocationContext before invoking your method on the cache.
E.g., to force a write lock when reading data (when used in a transaction, this provides semantics similar to SELECT FOR UPDATE in a database) 
      // first start a transaction
      cache.getInvocationContext().getOptionOverrides().setForceWriteLock(true);
      Node n = cache.getNode(Fqn.fromString("/a/b/c"));
      // make changes to the node
      // commit transaction
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E.g., to suppress replication of a put call in a REPL_SYNC cache: 
      Node node = cache.getChild(Fqn.fromString("/a/b/c"));
      cache.getInvocationContext().getOptionOverrides().setLocalOnly(true);
      node.put("localCounter", new Integer(2));
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See the Javadocs on the Option class for details on the options available.
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