Merge changes I578a2676,I4b37c2d0,Id1e2d638,I1ebe37da,I6135799c am: b6446bec0a am: fcd81b3e3f am: c7a6d4ec7d am: a9a7715d84

Original change: https://android-review.googlesource.com/c/platform/external/junit/+/1613132

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I56f45d05317bd1060b5838f1ada3a90bb2985d55

1 files changed, 77 insertions, 0 deletions

diff --git a/src/main/java/org/junit/internal/management/ManagementFactory.java b/src/main/java/org/junit/internal/management/ManagementFactory.java
new file mode 100644
index 0000000..5be1447
--- /dev/null
+++ b/src/main/java/org/junit/internal/management/ManagementFactory.java
@@ -0,0 +1,77 @@
+package org.junit.internal.management;
+
+import org.junit.internal.Classes;
+
+import java.lang.reflect.InvocationTargetException;
+
+/**
+ * Reflective wrapper around {@link java.lang.management.ManagementFactory}
+ */
+public class ManagementFactory {
+  private static final class FactoryHolder {
+    private static final Class<?> MANAGEMENT_FACTORY_CLASS;
+
+    static {
+      Class<?> managementFactoryClass = null;
+      try {
+        managementFactoryClass = Classes.getClass("java.lang.management.ManagementFactory");
+      } catch (ClassNotFoundException e) {
+        // do nothing, managementFactoryClass will be none on failure
+      }
+      MANAGEMENT_FACTORY_CLASS = managementFactoryClass;
+    }
+
+    static Object getBeanObject(String methodName) {
+      if (MANAGEMENT_FACTORY_CLASS != null) {
+        try {
+          return MANAGEMENT_FACTORY_CLASS.getMethod(methodName).invoke(null);
+        } catch (IllegalAccessException e) {
+          // fallthrough
+        } catch (IllegalArgumentException e) {
+          // fallthrough
+        } catch (InvocationTargetException e) {
+          // fallthrough
+        } catch (NoSuchMethodException e) {
+          // fallthrough
+        } catch (SecurityException e) {
+          // fallthrough
+        }
+      }
+      return null;
+    }
+  }
+
+  private static final class RuntimeHolder {
+    private static final RuntimeMXBean RUNTIME_MX_BEAN =
+        getBean(FactoryHolder.getBeanObject("getRuntimeMXBean"));
+
+    private static final RuntimeMXBean getBean(Object runtimeMxBean) {
+      return runtimeMxBean != null
+          ? new ReflectiveRuntimeMXBean(runtimeMxBean) : new FakeRuntimeMXBean();
+    }
+  }
+
+  private static final class ThreadHolder {
+    private static final ThreadMXBean THREAD_MX_BEAN =
+        getBean(FactoryHolder.getBeanObject("getThreadMXBean"));
+
+    private static final ThreadMXBean getBean(Object threadMxBean) {
+      return threadMxBean != null
+          ? new ReflectiveThreadMXBean(threadMxBean) : new FakeThreadMXBean();
+    }
+  }
+
+  /**
+   * @see java.lang.management.ManagementFactory#getRuntimeMXBean()
+   */
+  public static RuntimeMXBean getRuntimeMXBean() {
+    return RuntimeHolder.RUNTIME_MX_BEAN;
+  }
+
+  /**
+   * @see java.lang.management.ManagementFactory#getThreadMXBean()
+   */
+  public static ThreadMXBean getThreadMXBean() {
+    return ThreadHolder.THREAD_MX_BEAN;
+  }
+}