return s.get();
        } else {
            return cache.computeIfAbsent(groupId, artifactId, version, tag, s);
        }
    }

    private static <T> T cache(ModelCache cache, Source source, String tag, Callable<T> supplier) {
        Supplier<T> s = asSupplier(supplier);
        if (cache == null) {
            return s.get();
        } else {

                File file = new File(path);
                if (file.isAbsolute()) {
                    path = file.getAbsolutePath();
                } else if (".".equals(path)) {
                    path = getBasedir().getAbsolutePath();
                } else {
                    path = new File(getBasedir(), path).getAbsolutePath();
                }

                if (!paths.contains(path)) {

            if ("maven-resources-plugin".equals(plugin.getArtifactId())) {
                assertThat(resourcesPlugin, lessThan(0));
                resourcesPlugin = i;
            } else if ("maven-it-plugin-log-file".equals(plugin.getArtifactId())) {
                assertThat(customPlugin, lessThan(0));
                customPlugin = i;
            }
        }

        if (modelSource instanceof FileModelSource fms) {
            return ModelSource.fromPath(fms.getPath());
        } else if (modelSource instanceof ArtifactModelSource ams) {
            return ModelSource.fromPath(ams.getPath(), ams.toString());
        } else {
            return new ModelSource() {
                @Override
                public ModelSource resolve(ModelLocator modelLocator, String relative) {

                        null,
                        "must be unique but found duplicate declaration of plugin " + key,
                        plugin);
            } else {
                index.put(key, plugin);
            }

            Set<String> executionIds = new HashSet<>();

            for (PluginExecution exec : plugin.getExecutions()) {