Github user dick-twocows commented on a diff in the pull request:
https://github.com/apache/jena/pull/233#discussion_r110253625
--- Diff:
jena-arq/src/main/java/org/apache/jena/sparql/core/mosaic/ThreadProxy.java ---
@@ -0,0 +1,100 @@
+package org.apache.jena.sparql.core.mosaic;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Future;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * A Thread proxy which performs actions using one thread (the proxy).
+ * Internally an ExecutorService with one Thread is used with the action
methods execute/submit(Runnable) and submit(Callable<T>).
+ * Calls to the action methods are FIFO actioned through the
LinkedBlockingQueue of the ExecutorService.
+ * Useful where Thread affinity is required in a parallel processing
environment, e.g. .parallelStream().flatMap(...)
+ *
+ * @author dick
+ *
+ */
+public class ThreadProxy {
--- End diff --
What it was might have got lost in the iterations to is current form, let
me check...
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