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package com.yahoo.search.searchchain;
import com.yahoo.concurrent.ThreadFactoryFactory;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
/**
* Factory of the executor passed to renderers by default.
*
* @author bratseth
*/
class RenderingExecutorFactory {
private final int maxQueuedRenderingTasksPerProcessor;
private final int availableProcessors;
public RenderingExecutorFactory() {
this.maxQueuedRenderingTasksPerProcessor = 500;
this.availableProcessors = Runtime.getRuntime().availableProcessors();
}
ThreadPoolExecutor createExecutor() {
int maxOutstandingTasks = maxQueuedRenderingTasksPerProcessor * availableProcessors;
ThreadPoolExecutor executor = new ThreadPoolExecutor(availableProcessors, availableProcessors, 1L, TimeUnit.SECONDS,
new LinkedBlockingQueue<>(maxOutstandingTasks),
ThreadFactoryFactory.getThreadFactory("common-rendering"),
(task, exec) -> renderingRejected(maxOutstandingTasks));
executor.prestartAllCoreThreads();
return executor;
}
private void renderingRejected(int maxOutstandingTasks) {
throw new RejectedExecutionException("More than " + maxOutstandingTasks + " rendering tasks queued, rejecting this");
}
}
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