[ISSUE-36] Temp directories are not being cleaned up properly (#37)

* [ISSUE-36] Temp directories are not being cleaned up properly

* bump release version to 3.1.2

* update changelog

* resolve checkstyle violations

Author: Crim

CHANGELOG.md

@@ -2,6 +2,9 @@
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## 3.1.2 (11/08/2019)
+- [ISSUE-36](https://github.com/salesforce/kafka-junit/issues/36) Temporary directories should now be cleaned up properly on JVM shutdown.
+
 ## 3.1.1 (03/22/2019)
 - Replace internal uses of Guava with JDK-comparable methods so that if a transitive dependency on Curator resolves to a more recent version that shades Guava this library will not break.
 

kafka-junit-core/pom.xml

@@ -5,12 +5,12 @@
     <parent>
         <artifactId>kafka-junit</artifactId>
         <groupId>com.salesforce.kafka.test</groupId>
-        <version>3.1.1</version>
+        <version>3.1.2</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
     <artifactId>kafka-junit-core</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2</version>
 
     <!-- defined properties -->
     <properties>

kafka-junit-core/src/main/java/com/salesforce/kafka/test/Utils.java

@@ -27,7 +27,11 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.nio.file.FileVisitResult;
 import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.SimpleFileVisitor;
+import java.nio.file.attribute.BasicFileAttributes;
 
 /**
  * Collection of Utilities.
@@ -39,16 +43,49 @@ class Utils {
      */
     static File createTempDirectory() {
         // Create temp path to store logs
-        final File logDir;
+        final Path logDir;
         try {
-            logDir = Files.createTempDirectory("kafka-unit").toFile();
-        } catch (IOException e) {
+            logDir = Files.createTempDirectory("kafka-unit");
+        } catch (final IOException e) {
             throw new RuntimeException(e);
         }
 
-        // Ensure its removed on termination.
-        logDir.deleteOnExit();
+        // Ensure its removed on termination by recursively removing all files under the temp directory.
+        Utils.recursiveDeleteOnShutdownHook(logDir);
 
-        return logDir;
+        // Return as a File
+        return logDir.toFile();
+    }
+
+    /**
+     * Registers a shutdown hook to recursively cleanup/delete a directory and all of it's contents.
+     * @param path the Path to remove.
+     */
+    private static void recursiveDeleteOnShutdownHook(final Path path) {
+        Runtime.getRuntime().addShutdownHook(new Thread(
+            () -> {
+                try {
+                    Files.walkFileTree(path, new SimpleFileVisitor<Path>() {
+                        @Override
+                        public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) throws IOException {
+                            Files.delete(file);
+                            return FileVisitResult.CONTINUE;
+                        }
+
+                        @Override
+                        public FileVisitResult postVisitDirectory(final Path dir, final IOException exception) throws IOException {
+                            if (exception == null) {
+                                Files.delete(dir);
+                                return FileVisitResult.CONTINUE;
+                            }
+                            // directory iteration failed
+                            throw exception;
+                        }
+                    });
+                } catch (final IOException exception) {
+                    throw new RuntimeException("Failed to delete " + path, exception);
+                }
+            }
+        ));
     }
 }

kafka-junit4/README.md

@@ -20,7 +20,7 @@ Include this library in your project's POM with test scope.  **You'll also need
 <dependency>
     <groupId>com.salesforce.kafka.test</groupId>
     <artifactId>kafka-junit4</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2</version>
     <scope>test</scope>
 </dependency>
 ```
@@ -32,7 +32,7 @@ Include this library in your project's POM with test scope.  **You'll also need
 <dependency>
     <groupId>com.salesforce.kafka.test</groupId>
     <artifactId>kafka-junit4</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2</version>
     <scope>test</scope>
 </dependency>
 
@@ -58,7 +58,7 @@ Include this library in your project's POM with test scope.  **You'll also need
 <dependency>
     <groupId>com.salesforce.kafka.test</groupId>
     <artifactId>kafka-junit4</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2</version>
     <scope>test</scope>
 </dependency>
 
@@ -84,7 +84,7 @@ Include this library in your project's POM with test scope.  **You'll also need
 <dependency>
     <groupId>com.salesforce.kafka.test</groupId>
     <artifactId>kafka-junit4</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2</version>
     <scope>test</scope>
 </dependency>
 
@@ -110,7 +110,7 @@ Include this library in your project's POM with test scope.  **You'll also need
 <dependency>
     <groupId>com.salesforce.kafka.test</groupId>
     <artifactId>kafka-junit4</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2</version>
     <scope>test</scope>
 </dependency>
 

kafka-junit4/pom.xml

@@ -32,13 +32,13 @@
     <parent>
         <artifactId>kafka-junit</artifactId>
         <groupId>com.salesforce.kafka.test</groupId>
-        <version>3.1.1</version>
+        <version>3.1.2</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
     <!-- Module Definition & Version -->
     <artifactId>kafka-junit4</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2</version>
 
     <!-- defined properties -->
     <properties>
@@ -50,7 +50,7 @@
         <dependency>
             <groupId>com.salesforce.kafka.test</groupId>
             <artifactId>kafka-junit-core</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2</version>
         </dependency>
 
         <!-- JUnit is Required -->

kafka-junit5/README.md

@@ -20,7 +20,7 @@ Include this library in your project's POM with test scope.  **You'll also need
 <dependency>
     <groupId>com.salesforce.kafka.test</groupId>
     <artifactId>kafka-junit5</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2</version>
     <scope>test</scope>
 </dependency>
 ```
@@ -31,7 +31,7 @@ Include this library in your project's POM with test scope.  **You'll also need
 <dependency>
     <groupId>com.salesforce.kafka.test</groupId>
     <artifactId>kafka-junit5</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2</version>
     <scope>test</scope>
 </dependency>
 
@@ -57,7 +57,7 @@ Include this library in your project's POM with test scope.  **You'll also need
 <dependency>
     <groupId>com.salesforce.kafka.test</groupId>
     <artifactId>kafka-junit5</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2</version>
     <scope>test</scope>
 </dependency>
 
@@ -83,7 +83,7 @@ Include this library in your project's POM with test scope.  **You'll also need
 <dependency>
     <groupId>com.salesforce.kafka.test</groupId>
     <artifactId>kafka-junit5</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2</version>
     <scope>test</scope>
 </dependency>
 
@@ -109,7 +109,7 @@ Include this library in your project's POM with test scope.  **You'll also need
 <dependency>
     <groupId>com.salesforce.kafka.test</groupId>
     <artifactId>kafka-junit5</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2</version>
     <scope>test</scope>
 </dependency>
 

kafka-junit5/pom.xml

@@ -31,12 +31,12 @@
     <parent>
         <artifactId>kafka-junit</artifactId>
         <groupId>com.salesforce.kafka.test</groupId>
-        <version>3.1.1</version>
+        <version>3.1.2</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
     <artifactId>kafka-junit5</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2</version>
 
     <!-- defined properties -->
     <properties>
@@ -48,7 +48,7 @@
         <dependency>
             <groupId>com.salesforce.kafka.test</groupId>
             <artifactId>kafka-junit-core</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2</version>
         </dependency>
 
         <!-- JUnit is Required -->

pom.xml

@@ -32,7 +32,7 @@
 
     <groupId>com.salesforce.kafka.test</groupId>
     <artifactId>kafka-junit</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2</version>
 
     <!-- Submodules -->
     <modules>