Move static ContextCache to DefaultCacheAwareContextLoaderDelegate

Issue: SPR-12683

spring-test/src/main/java/org/springframework/test/context/DefaultCacheAwareContextLoaderDelegate.java

 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -40,9 +40,30 @@ class DefaultCacheAwareContextLoaderDelegate implements CacheAwareContextLoaderD
 
 	private static final Log statsLogger = LogFactory.getLog("org.springframework.test.context.cache");
 
+	/**
+	 * Default cache of Spring application contexts.
+	 *
+	 * <p>This default cache is static, so that each context can be cached
+	 * and reused for all subsequent tests that declare the same unique
+	 * context configuration within the same JVM process.
+	 */
+	static final ContextCache defaultContextCache = new ContextCache();
+
 	private final ContextCache contextCache;
 
 
+	/**
+	 * Construct a new {@code DefaultCacheAwareContextLoaderDelegate} that
+	 * uses the default, static {@code ContextCache}.
+	 */
+	DefaultCacheAwareContextLoaderDelegate() {
+		this(defaultContextCache);
+	}
+
+	/**
+	 * Construct a new {@code DefaultCacheAwareContextLoaderDelegate} with
+	 * the supplied {@code ContextCache}.
+	 */
 	DefaultCacheAwareContextLoaderDelegate(ContextCache contextCache) {
 		Assert.notNull(contextCache, "ContextCache must not be null");
 		this.contextCache = contextCache;

spring-test/src/main/java/org/springframework/test/context/TestContextManager.java

@@ -73,14 +73,6 @@ public class TestContextManager {
 
 	private static final Log logger = LogFactory.getLog(TestContextManager.class);
 
-	/**
-	 * Cache of Spring application contexts.
-	 * <p>This needs to be static, since test instances may be destroyed and
-	 * recreated between invocations of individual test methods, as is the case
-	 * with JUnit.
-	 */
-	static final ContextCache contextCache = new ContextCache();
-
 	private final TestContext testContext;
 
 	private final List<TestExecutionListener> testExecutionListeners = new ArrayList<TestExecutionListener>();
@@ -88,14 +80,14 @@ public class TestContextManager {
 
 	/**
 	 * Construct a new {@code TestContextManager} for the specified {@linkplain Class test class}
-	 * and automatically {@link #registerTestExecutionListeners register} the
+	 * and automatically {@linkplain #registerTestExecutionListeners register} the
 	 * {@link TestExecutionListener TestExecutionListeners} configured for the test class
 	 * via the {@link TestExecutionListeners @TestExecutionListeners} annotation.
 	 * @param testClass the test class to be managed
 	 * @see #registerTestExecutionListeners
 	 */
 	public TestContextManager(Class<?> testClass) {
-		CacheAwareContextLoaderDelegate cacheAwareContextLoaderDelegate = new DefaultCacheAwareContextLoaderDelegate(contextCache);
+		CacheAwareContextLoaderDelegate cacheAwareContextLoaderDelegate = new DefaultCacheAwareContextLoaderDelegate();
 		BootstrapContext bootstrapContext = new DefaultBootstrapContext(testClass, cacheAwareContextLoaderDelegate);
 		TestContextBootstrapper testContextBootstrapper = BootstrapUtils.resolveTestContextBootstrapper(bootstrapContext);
 		this.testContext = new DefaultTestContext(testContextBootstrapper);

spring-test/src/test/java/org/springframework/test/context/ContextCacheTestUtils.java

@@ -28,14 +28,14 @@ import static org.junit.Assert.*;
 public class ContextCacheTestUtils {
 
 	/**
-	 * Reset the state of the context cache.
+	 * Reset the state of the static context cache in {@link DefaultCacheAwareContextLoaderDelegate}.
 	 */
 	public static final void resetContextCache() {
-		TestContextManager.contextCache.reset();
+		DefaultCacheAwareContextLoaderDelegate.defaultContextCache.reset();
 	}
 
 	/**
-	 * Assert the statistics of the context cache in {@link TestContextManager}.
+	 * Assert the statistics of the static context cache in {@link DefaultCacheAwareContextLoaderDelegate}.
 	 *
 	 * @param usageScenario the scenario in which the statistics are used
 	 * @param expectedSize the expected number of contexts in the cache
@@ -44,8 +44,8 @@ public class ContextCacheTestUtils {
 	 */
 	public static final void assertContextCacheStatistics(String usageScenario, int expectedSize, int expectedHitCount,
 			int expectedMissCount) {
-		assertContextCacheStatistics(TestContextManager.contextCache, usageScenario, expectedSize, expectedHitCount,
-			expectedMissCount);
+		assertContextCacheStatistics(DefaultCacheAwareContextLoaderDelegate.defaultContextCache, usageScenario,
+			expectedSize, expectedHitCount, expectedMissCount);
 	}
 
 	/**