Package org.apache.lucene.search
Class TaskExecutor
java.lang.Object
org.apache.lucene.search.TaskExecutor
Executor wrapper responsible for the execution of concurrent tasks. Used to parallelize search
across segments as well as query rewrite in some cases. Exposes a single
invokeAll(Collection)
method that takes a collection of Callable
s and executes them
concurrently/ Once all tasks are submitted to the executor, it blocks and wait for all tasks to
be completed, and then returns a list with the obtained results. Ensures that the underlying
executor is only used for top-level invokeAll(Collection)
calls, and not for potential
invokeAll(Collection)
calls made from one of the tasks. This is to prevent deadlock with
certain types of pool based executors (e.g. ThreadPoolExecutor
).- WARNING: This API is experimental and might change in incompatible ways in the next release.
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Constructor Summary
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Method Summary
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Constructor Details
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TaskExecutor
Creates a TaskExecutor instance- Parameters:
executor
- the executor to be used for running tasks concurrently
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Method Details
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invokeAll
Execute all the callables provided as an argument, wait for them to complete and return the obtained results. If an exception is thrown by more than one callable, the subsequent ones will be added as suppressed exceptions to the first one that was caught.- Type Parameters:
T
- the return type of the task execution- Parameters:
callables
- the callables to execute- Returns:
- a list containing the results from the tasks execution
- Throws:
IOException
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toString
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