Can any one help me in supplying a prototype or approach for a Deployer Extension in Java for SDL Tridion 2011, so that this app/process/module can consume the delta publish and index that content into Apache Solr?
Please take a look at these other questions on SO:
How can we override the existing deployer customization in Tridion 2009?
Running Custom Deployer from Eclipse
How to make a Custom Deployer to write data to MS SQL database?
Need to get the XML of a component's that version which is published
How can we integrate Microsoft FAST with SDL Tridion 2011 SP1?
The last one specifically deals with updating a search collection. If this does not help, please show us what you have tried with some code samples.