Just like all request handlers, update handlers can be mapped to a specific URL and have their own set of default or invariant parameters.
Each update handler can have it’s own Update Processor Chain that can do Document-level operations prior to indexing, or even redirect indexing to a different server or create multiple documents (or zero) from a single one.
All of the configuration is declarative, including the specification of update processor chains.
Lucene/Solr 查询插件架构
Lucene/Solr plugins
RequestHandlers – handle a request at a URL like /select
SearchComponents – part of a SearchHandler, a componentized request handler
Includes, Query, Facet, Highlight, Debug, Stats
Distributed Search capable
UpdateHandlers – handle an indexing request
Update Processor Chains – per-handler componentized chain that handle updates
Query Parser plugins
Mix and match query types in a single request
Function plugins for Function Query
Text Analysis plugins: Analyzers, Tokenizers, TokenFilters
ResponseWriters serialize & stream response to client
Lucene/Solr 请求插件架构
特性说明
Each request handler can be mapped to a different URL
SearchHandler is a componentized RequestHandler that allows search components to be chained together and also enables the framework for distributed search operations.
Each SearchHandler can have it’s own custom set of search components, along with default or invariant parameters
All of the configuration is declarative – including adding new request handlers or search components.
The QueryResponse object is very generic and can handle returning any type of data
