8152432: Implement setting jtreg @requires properties vm.flavor, vm.bits, vm.compMode

Reviewed-by: iignatyev

test/jtreg-ext/requires/VMProps.java

@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2016, 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.
+ *
+ * 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 requires;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.Callable;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * The Class to be invoked by jtreg prior Test Suite execution to
+ * collect information about VM.
+ * Properties set by this Class will be available in the @requires expressions.
+ */
+public class VMProps implements Callable<Map<String, String>> {
+
+    /**
+     * Collects information about VM properties.
+     * This method will be invoked by jtreg.
+     *
+     * @return Map of property-value pairs.
+     */
+    @Override
+    public Map<String, String> call() {
+        Map<String, String> map = new HashMap<>();
+        map.put("vm.flavor", vmFlavor());
+        map.put("vm.compMode", vmCompMode());
+        map.put("vm.bits", vmBits());
+        dump(map);
+        return map;
+    }
+
+    /**
+     * @return VM type value extracted from the "java.vm.name" property.
+     */
+    protected String vmFlavor() {
+        // E.g. "Java HotSpot(TM) 64-Bit Server VM"
+        String vmName = System.getProperty("java.vm.name");
+        if (vmName == null) {
+            return null;
+        }
+
+        Pattern startP = Pattern.compile(".* (\\S+) VM");
+        Matcher m = startP.matcher(vmName);
+        if (m.matches()) {
+            return m.group(1).toLowerCase();
+        }
+        return null;
+    }
+
+    /**
+     * @return VM compilation mode extracted from the "java.vm.info" property.
+     */
+    protected String vmCompMode() {
+        // E.g. "mixed mode"
+        String vmInfo = System.getProperty("java.vm.info");
+        if (vmInfo == null) {
+            return null;
+        }
+        int k = vmInfo.toLowerCase().indexOf(" mode");
+        if (k < 0) {
+            return null;
+        }
+        vmInfo = vmInfo.substring(0, k);
+        switch (vmInfo) {
+            case "mixed" : return "Xmixed";
+            case "compiled" : return "Xcomp";
+            case "interpreted" : return "Xint";
+            default: return null;
+        }
+    }
+
+    /**
+     * @return VM bitness, the value of the "sun.arch.data.model" property.
+     */
+    protected String vmBits() {
+        return System.getProperty("sun.arch.data.model");
+    }
+
+    /**
+     * Dumps the map to the file if the file name is given as the property.
+     * This functionality could be helpful to know context in the real
+     * execution.
+     *
+     * @param map
+     */
+    protected void dump(Map<String, String> map) {
+        String dumpFileName = System.getProperty("vmprops.dump");
+        if (dumpFileName == null) {
+            return;
+        }
+        List<String> lines = new ArrayList<>();
+        map.forEach((k,v) -> lines.add(k + ":" + v));
+        try {
+             Files.write(Paths.get(dumpFileName), lines);
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to dump properties into '"
+                    + dumpFileName + "'", e);
+        }
+    }
+
+    /**
+     * This method is for the testing purpose only.
+     * @param args
+     */
+    public static void main(String args[]) {
+        Map<String, String> map = new VMProps().call();
+        map.forEach((k,v) -> System.out.println(k + ": '" + v + "'"));
+    }
+}