[CPython] prevent repeated package caching

bytedeco · Aug 20, 2021 · 2816d66 · 2816d66
1 parent 6451db0
commit 2816d66
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/cpython/src/main/java/org/bytedeco/cpython/presets/python.java b/cpython/src/main/java/org/bytedeco/cpython/presets/python.java
@@ -208,8 +208,13 @@
 public class python implements InfoMapper {
     static { Loader.checkVersion("org.bytedeco", "cpython"); }
 
+    private static volatile File packageFile = null;
+
     /** Returns {@code Loader.cacheResource("/org/bytedeco/cpython/" + Loader.getPlatform())} and monkey patches files accordingly. */
     public static File cachePackage() throws IOException {
+        if (packageFile != null) {
+            return packageFile;
+        }
         File pythonFile = Loader.cacheResource("/org/bytedeco/cpython/" + Loader.getPlatform());
         File configDir = new File(pythonFile, "lib/python3.9/");
         if (configDir.exists()) {
@@ -246,7 +251,7 @@ public static File cachePackage() throws IOException {
                 }
             }
         }
-        return pythonFile;
+        return packageFile = pythonFile;
     }
 
     /** Returns {@code {f, new File(f, "site-packages"), new File(f, "python3.9"), new File(f, "python3.9/lib-dynload"), new File(f, "python3.9/site-packages")}} where {@code File f = new File(cachePackage(), "lib")}. */