Issue-1140 - cancel running jobs on merge request update when source branch is same

Author: remigiuszd

src/main/java/com/dabsquared/gitlabjenkins/trigger/handler/PendingBuildsHandler.java

@@ -8,10 +8,7 @@
 import com.dabsquared.gitlabjenkins.gitlab.api.model.BuildState;
 import com.dabsquared.gitlabjenkins.publisher.GitLabCommitStatusPublisher;
 import com.dabsquared.gitlabjenkins.util.LoggerUtil;
-import hudson.model.AbstractProject;
-import hudson.model.Cause;
-import hudson.model.Job;
-import hudson.model.Queue;
+import hudson.model.*;
 import jenkins.model.Jenkins;
 import org.apache.commons.lang.StringUtils;
 import org.jenkinsci.plugins.displayurlapi.DisplayURLProvider;
@@ -24,7 +21,7 @@ public class PendingBuildsHandler {
 
     private static final Logger LOGGER = Logger.getLogger(PendingBuildsHandler.class.getName());
 
-    public void cancelPendingBuilds(Job<?, ?> job, Integer projectId, String branch) {
+    public void cancelPendingBuilds(Job<?, ?> job, Integer projectId, String sourceBranch) {
         Queue queue = Jenkins.getInstance().getQueue();
         for (Queue.Item item : queue.getItems()) {
             if (!job.getName().equals(item.task.getName())) {
@@ -38,11 +35,29 @@ public void cancelPendingBuilds(Job<?, ?> job, Integer projectId, String branch)
             if (!projectId.equals(queueItemCauseData.getSourceProjectId())) {
                 continue;
             }
-            if (branch.equals(queueItemCauseData.getBranch())) {
-                cancel(item, queue, branch);
+            if (sourceBranch.equals(queueItemCauseData.getBranch())) {
+                cancel(item, queue, sourceBranch);
                 setCommitStatusCancelledIfNecessary(queueItemCauseData, job);
             }
         }
+        stopRunningBuilds(job, sourceBranch);
+    }
+
+    private void stopRunningBuilds(Job<?, ?> job, String sourceBranch) {
+        for (Run<?, ?> build : job.getBuilds()) {
+            if (build.isBuilding() && runsCausedByMergeToSourceBranch(build, sourceBranch)) {
+                LOGGER.log(Level.INFO, "Stopping build {0} of job {1} caused by commit to branch {2}", LoggerUtil.toArray(build.getDisplayName(), job.getName(), sourceBranch));
+                Executor executor = build.getExecutor();
+                if (executor != null) executor.doStop();
+                GitLabWebHookCause cause = build.getCause(GitLabWebHookCause.class);
+                if (cause != null) setCommitStatusCancelledIfNecessary(cause.getData(), job);
+            }
+        }
+    }
+
+    private boolean runsCausedByMergeToSourceBranch(Run<?, ?> build, String sourceBranch) {
+        GitLabWebHookCause cause = build.getCause(GitLabWebHookCause.class);
+        return cause != null && cause.getData().getSourceBranch().equals(sourceBranch);
     }
 
     private GitLabWebHookCause getGitLabWebHookCauseData(Queue.Item item) {