Changeset 7423 in josm for trunk/src/org/openstreetmap/josm/tools

Timestamp:

2014-08-16T20:14:24+02:00 (10 years ago)

Author:

Don-vip

Message:

see #9680, see #4626 - multithreaded multipolygon creation

File:

• trunk/src/org/openstreetmap/josm/tools/Utils.java (modified) (2 diffs)

trunk/src/org/openstreetmap/josm/tools/Utils.java

@@ -42 +42 @@
 import java.util.Iterator;
 import java.util.List;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -1064 +1066 @@
         return true;
     }
+
+    /**
+     * Returns a pair containing the number of threads (n), and a thread pool (if n > 1) to perform
+     * multi-thread computation in the context of the given preference key.
+     * @param pref The preference key
+     * @return a pair containing the number of threads (n), and a thread pool (if n > 1, null otherwise)
+     * @since 7423
+     */
+    public static Pair<Integer, ExecutorService> newThreadPool(String pref) {
+        int noThreads = Main.pref.getInteger(pref, Runtime.getRuntime().availableProcessors());
+        ExecutorService pool = noThreads <= 1 ? null : Executors.newFixedThreadPool(noThreads);
+        return new Pair<>(noThreads, pool);
+    }
 }