replace notification handlers with event listeners

[Artem Koshelev]

https://docs.atlassian.com/bitbucket-server/javadoc/5.8.0/api/reference/com/atlassian/bitbucket/event/pull/package-summary.html

[Artem Koshelev]

@Component
public class PullRequestListener {

    private final CommitService commitService;
    private final CoverageManager coverageManager;
    private final SecurityService securityService;

    public PullRequestListener(CommitService commitService, CoverageManager coverageManager,
                               SecurityService securityService) {
        this.commitService = commitService;
        this.coverageManager = coverageManager;
        this.securityService = securityService;
    }

    @EventListener
    public void onPullRequestDeclined(PullRequestDeclinedEvent event) {
        cleanupCoverage(event.getPullRequest());
    }

    @EventListener
    public void onPullRequestDeleted(PullRequestDeletedEvent event) {
        cleanupCoverage(event.getPullRequest());
    }

    @EventListener
    public void onPullRequestMerged(PullRequestMergedEvent event) {
        cleanupCoverage(event.getPullRequest());
    }

    private void cleanupCoverage(PullRequest pullRequest) {
        securityService.escalate("Clean up coverage")
                .withPermission(pullRequest.getFromRef().getRepository(), Permission.REPO_READ)
                .withPermission(pullRequest.getToRef().getRepository(), Permission.REPO_READ)
                .call(() -> {
                    commitService.streamCommitsBetween(new CommitsBetweenRequest.Builder(pullRequest).build(),
                            commit -> {
                                coverageManager.deleteCoverage(commit.getId());
                                return true;
                            });
                    return null;
                });
    }
}