Package com.yahoo.search.searchchain

Class AsyncExecution

java.lang.Object
com.yahoo.search.searchchain.AsyncExecution
public class AsyncExecution extends Object
Provides asynchronous execution of searchchains.

AsyncExecution is implemented as an asynchronous wrapper around Execution that returns Future.

This is used in the following way 
 Execution execution = new Execution(searchChain, context);
 AsyncExecution asyncExecution = new AsyncExecution(execution);
 Future<Result> future = asyncExecution.search(query)
 try {
     result = future.get(timeout, TimeUnit.milliseconds);
 } catch(TimeoutException e) {
     // Handle timeout
 }

Note that the query is not a thread safe object and cannot be shared between multiple concurrent executions - a clone() must be made, or a new query created for each AsyncExecution instance.

Author:
Arne Bergene Fossaa
See Also:

  • Constructor Details

    • AsyncExecution

      public AsyncExecution(com.yahoo.component.chain.Chain<? extends Searcher> chain, Execution execution)
      Creates an async execution.
      Parameters:
      chain - the chain to execute
      execution - the execution holding the context of this

    • AsyncExecution

      public AsyncExecution(com.yahoo.component.chain.Chain<? extends Searcher> chain, Execution.Context context)
      Creates an async execution.
      Parameters:
      chain - the chain to execute
      context - the the context of this

    • AsyncExecution

      public AsyncExecution(Execution execution)

      Creates an async execution from an existing execution. This async execution will execute the chain from the given execution, starting from the next searcher in that chain. This is handy to execute multiple queries to the rest of the chain in parallel. If the Execution is freshly instantiated, the search will obviously start from the first searcher.

      The state of the given execution is read on construction of this and not used later - the argument execution can be reused for other purposes.

      Parameters:
      execution - the execution from which the state of this is created
      See Also:

  • Method Details

    • search

      public FutureResult search(Query query)
      Does an async search, note that the query argument cannot simultaneously be used to execute any other searches, a clone() must be made of the query for each async execution if the same query is to be used in more than one.
      See Also:

    • searchAndFill

      public FutureResult searchAndFill(Query query)

    • fill

      public FutureResult fill(Result result, String summaryClass)
      The future of this functions returns the original Result
      See Also:

    • waitForAll

      public static List<Result> waitForAll(Collection<FutureResult> tasks, long timeoutMs)