Adding RemainingActivityListener for diagnosis

src/main/java/org/jvnet/hudson/test/RemainingActivityListener.java

@@ -0,0 +1,84 @@
+/*
+ * The MIT License
+ *
+ * Copyright 2023 CloudBees, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package org.jvnet.hudson.test;
+
+import hudson.Extension;
+import hudson.model.Computer;
+import hudson.model.Executor;
+import hudson.model.Queue;
+import java.util.logging.Logger;
+import jenkins.model.Jenkins;
+
+/**
+ * Checks for any ongoing activity (queue, builds) that might interfere with {@link TemporaryDirectoryAllocator#dispose}.
+ */
+@Extension
+public final class RemainingActivityListener implements EndOfTestListener {
+
+    /**
+     * Set to true if you wish for warnings to be treated as fatal test errors.
+     */
+    private static final boolean fatal = Boolean.getBoolean(RemainingActivityListener.class.getName() + ".fatal");
+
+    /**
+     * Set to true if you wish for test shutdown to just wait for activity to cease (not always appropriate).
+     */
+    private static final boolean wait = Boolean.getBoolean(RemainingActivityListener.class.getName() + ".wait");
+
+    @Override
+    public void onTearDown() throws Exception {
+        if (wait) {
+            String problem;
+            while ((problem = problem()) != null) {
+                Logger.getLogger(RemainingActivityListener.class.getName()).warning(problem);
+                Thread.sleep(5_000);
+            }
+        } else {
+            String problem = problem();
+            if (problem != null) {
+                if (fatal) {
+                    throw new AssertionError(problem);
+                } else {
+                    Logger.getLogger(RemainingActivityListener.class.getName()).warning(problem);
+                }
+            }
+        }
+    }
+
+    private static String problem() {
+        for (Computer c : Jenkins.get().getComputers()) {
+            for (Executor x : c.getAllExecutors()) {
+                if (!x.isIdle()) {
+                    return x.getCurrentExecutable() + " still seems to be running, which could break deletion of log files or metadata";
+                }
+            }
+        }
+        for (Queue.Item q : Queue.getInstance().getItems()) {
+            return q + " is still scheduled, which if it ever runs, could break deletion of log files or metadata";
+        }
+        return null;
+    }
+
+}