1 /*
   2  * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 package org.graalvm.compiler.debug;
  26 
  27 import java.util.ArrayList;
  28 import java.util.List;
  29 
  30 import jdk.internal.vm.compiler.collections.EconomicMap;
  31 
  32 /**
  33  * Registry for allocating a globally unique integer id to each {@link AbstractKey}.
  34  */
  35 public class KeyRegistry {
  36 
  37     private static final EconomicMap<String, Integer> keyMap = EconomicMap.create();
  38     private static final List<AbstractKey> keys = new ArrayList<>();
  39 
  40     /**
  41      * Ensures a given metric key is registered.
  42      *
  43      * @return the globally unique id for {@code value}
  44      */
  45     static synchronized int register(AbstractKey key) {
  46         String name = key.getName();
  47         if (!keyMap.containsKey(name)) {
  48             keyMap.put(name, keys.size());
  49             keys.add(key);
  50         }
  51         return keyMap.get(name);
  52     }
  53 
  54     /**
  55      * Gets a copy of the registered keys.
  56      *
  57      * @return a list where {@code get(i).getIndex() == i}
  58      */
  59     public static synchronized List<MetricKey> getKeys() {
  60         return new ArrayList<>(keys);
  61     }
  62 }