// ===================================================================================
    //                                                                         Aggregation
    //                                                                         ===========
    public BsFileConfigCA aggregation() {
        assertAggregationPurpose();
        return doGetConditionAggregation();
    }

    // ===================================================================================
    //                                                                         Aggregation
    //                                                                         ===========
    public BsSearchLogCA aggregation() {
        assertAggregationPurpose();
        return doGetConditionAggregation();
    }

    protected BsSearchLogCA doGetConditionAggregation() {

    //                                                                         Aggregation
    //                                                                         ===========
    public BsDuplicateHostCA aggregation() {
        assertAggregationPurpose();
        return doGetConditionAggregation();
    }

    //                                                                         Aggregation
    //                                                                         ===========
    public BsRelatedQueryCA aggregation() {
        assertAggregationPurpose();
        return doGetConditionAggregation();
    }

    // ===================================================================================
    //                                                                         Aggregation
    //                                                                         ===========
    public BsDataConfigCA aggregation() {
        assertAggregationPurpose();
        return doGetConditionAggregation();
    }

    // ===================================================================================
    //                                                                         Aggregation
    //                                                                         ===========
    public BsUserCA aggregation() {
        assertAggregationPurpose();
        return doGetConditionAggregation();
    }

    protected BsUserCA doGetConditionAggregation() {

        public NoLock() {}

        @Override
        public void close() {}
    }

    /**
     * Aggregating mojo executions (possibly) modify all MavenProjects, including those that are currently in use
     * by concurrently running mojo executions. To prevent race conditions, an aggregating execution will block
     * all other executions until finished.

            logger.debug("Tasks:   " + projectBuild.getTaskSegment().getTasks());
            logger.debug("Style:   " + (projectBuild.getTaskSegment().isAggregating() ? "Aggregating" : "Regular"));

            if (it.hasNext()) {
                logger.debug("-----------------------------------------------------------------------");
            }
        }

ProjectDependencyGraphStub

Since they define the primary structure of the project/build.

The stubs define three top-level targets that are defined in  LifecycleTaskSegmentCalculatorStub;
clean, aggr and install. "aggr" is an aggregating task while clean and install are lifecyclephases.
There will be three items in the task list for this dataset.

The stubs also exist at different "levels", where one test might wire stubs into a specific live implementation.

        }
    }

    Key createKey(
            MavenProject project,
            Collection<String> scopesToCollect,
            Collection<String> scopesToResolve,
            boolean aggregating,
            RepositorySystemSession session);

    CacheRecord get(Key key) throws LifecycleExecutionException;

    CacheRecord put(Key key, Set<Artifact> pluginArtifacts);