changeset 211:6162f1945f88

singletons: add SafeLocal and Synchronized variants.
author shade
date Sat, 27 Sep 2014 21:46:24 +0400
parents 31dbc6275b2d
children 9270b927e00f
files tests-custom/src/main/java/org/openjdk/jcstress/tests/singletons/SafeLocalDCL.java tests-custom/src/main/java/org/openjdk/jcstress/tests/singletons/SynchronizedCL.java
diffstat 2 files changed, 173 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests-custom/src/main/java/org/openjdk/jcstress/tests/singletons/SafeLocalDCL.java	Sat Sep 27 21:46:24 2014 +0400
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package org.openjdk.jcstress.tests.singletons;
+
+import org.openjdk.jcstress.annotations.Actor;
+import org.openjdk.jcstress.annotations.JCStressMeta;
+import org.openjdk.jcstress.annotations.JCStressTest;
+import org.openjdk.jcstress.annotations.State;
+import org.openjdk.jcstress.infra.results.IntResult1;
+
+import java.util.function.Supplier;
+
+/**
+ * Tests the safe double-checked locking singleton.
+ *
+ * @author Aleksey Shipilev (aleksey.shipilev@oracle.com)
+ */
+public class SafeLocalDCL {
+
+    @JCStressTest
+    @JCStressMeta(GradingSafe.class)
+    public static class Unsafe {
+        @Actor
+        public final void actor1(SafeSingletonFactory s) {
+            s.getInstance(SingletonUnsafe::new);
+        }
+
+        @Actor
+        public final void actor2(SafeSingletonFactory s, IntResult1 r) {
+            r.r1 = Singleton.map(s.getInstance(SingletonUnsafe::new));
+        }
+    }
+
+    @JCStressTest
+    @JCStressMeta(GradingSafe.class)
+    public static class Safe {
+        @Actor
+        public final void actor1(SafeSingletonFactory s) {
+            s.getInstance(SingletonSafe::new);
+        }
+
+        @Actor
+        public final void actor2(SafeSingletonFactory s, IntResult1 r) {
+            r.r1 = Singleton.map(s.getInstance(SingletonSafe::new));
+        }
+    }
+
+    @State
+    public static class SafeSingletonFactory {
+        private volatile Singleton instance;
+
+        public Singleton getInstance(Supplier<Singleton> s) {
+            Singleton i = instance;
+            if (i == null) {
+                synchronized (this) {
+                    i = instance;
+                    if (i == null) {
+                        i = s.get();
+                        instance = i;
+                    }
+                }
+            }
+            return i;
+        }
+    }
+
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests-custom/src/main/java/org/openjdk/jcstress/tests/singletons/SynchronizedCL.java	Sat Sep 27 21:46:24 2014 +0400
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package org.openjdk.jcstress.tests.singletons;
+
+import org.openjdk.jcstress.annotations.Actor;
+import org.openjdk.jcstress.annotations.JCStressMeta;
+import org.openjdk.jcstress.annotations.JCStressTest;
+import org.openjdk.jcstress.annotations.State;
+import org.openjdk.jcstress.infra.results.IntResult1;
+
+import java.util.function.Supplier;
+
+/**
+ * Tests the safe double-checked locking singleton.
+ *
+ * @author Aleksey Shipilev (aleksey.shipilev@oracle.com)
+ */
+public class SynchronizedCL {
+
+    @JCStressTest
+    @JCStressMeta(GradingSafe.class)
+    public static class Unsafe {
+        @Actor
+        public final void actor1(SafeSingletonFactory s) {
+            s.getInstance(SingletonUnsafe::new);
+        }
+
+        @Actor
+        public final void actor2(SafeSingletonFactory s, IntResult1 r) {
+            r.r1 = Singleton.map(s.getInstance(SingletonUnsafe::new));
+        }
+    }
+
+    @JCStressTest
+    @JCStressMeta(GradingSafe.class)
+    public static class Safe {
+        @Actor
+        public final void actor1(SafeSingletonFactory s) {
+            s.getInstance(SingletonSafe::new);
+        }
+
+        @Actor
+        public final void actor2(SafeSingletonFactory s, IntResult1 r) {
+            r.r1 = Singleton.map(s.getInstance(SingletonSafe::new));
+        }
+    }
+
+    @State
+    public static class SafeSingletonFactory {
+        private Singleton instance;
+
+        public Singleton getInstance(Supplier<Singleton> s) {
+            synchronized (this) {
+                if (instance == null) {
+                    instance = s.get();
+                }
+                return instance;
+            }
+        }
+    }
+
+}