private boolean parallel;

    /**
     * Plugin context keyed by project ({@link MavenProject#getId()}) and by plugin lookup key
     * ({@link PluginDescriptor#getPluginLookupKey()}). Plugin contexts itself are mappings of {@link String} keys to
     * {@link Object} values.
     */
    private final ConcurrentMap<String, ConcurrentMap<String, ConcurrentMap<String, Object>>>

    public static String constructPluginKey(String groupId, String artifactId, String version) {
        return groupId + ":" + artifactId + ":" + version;
    }

    public String getPluginLookupKey() {
        return groupId + ":" + artifactId;
    }

    public String getId() {
        return constructPluginKey(groupId, artifactId, version);
    }