public MatrixAggregator createAggregator(MatrixBuild build, Launcher launcher, BuildListener listener) {
        return new MatrixAggregator(build, launcher, listener) {

            @Override
            public boolean endRun(MatrixRun run) throws InterruptedException, IOException {
                boolean result = _perform(run, launcher, listener);
                run.save(); //it is important !!
                return result;
            }
        };
    }