assertUniqueKey(key);

        CacheRecord record = new CacheRecord(Collections.unmodifiableList(new ArrayList<>(pluginArtifacts)));

        cache.put(key, record);

        return record;
    }

    protected void assertUniqueKey(Key key) {
        if (cache.containsKey(key)) {
            throw new IllegalStateException("Duplicate artifact resolution result for plugin " + key);
        }
    }