public void close()

in src/main/java/org/apache/cassandra/distributed/shared/InstanceClassLoader.java [219:248]

20 lines of code
2 McCabe index (conditional complexity)


    public void close() throws IOException
    {
        isClosed = true;
        super.close();
        try
        {
            // The JVM really wants to prevent Class instances from being GCed until the
            // classloader which loaded them is GCed. It therefore maintains a list
            // of Class instances for the sole purpose of providing a GC root for them.
            // Here, we actually want the class instances to be GCed even if this classloader
            // somehow gets stuck with a GC root, so we clear the class list via reflection.
            // The current features implemented technically work without this, but the Garbage
            // Collector works more efficiently with it here, and it may provide value to new
            // feature developers.
            Field f = getField(ClassLoader.class, "classes");
            f.setAccessible(true);
            List<Class<?>> classes = (List<Class<?>>) f.get(this);
            classes.clear();
            // Same problem with packages - without clearing this,
            // the instance classloader can't unload
            f = getField(ClassLoader.class, "packages");
            f.setAccessible(true);
            Map<?,?> packageMap = (Map<?, ?>) f.get(this);
            packageMap.clear();
        }
        catch (Throwable e)
        {
            throw new RuntimeException(e);
        }
    }