author | egahlin |
Mon, 16 Sep 2019 09:45:22 +0200 | |
branch | JEP-349-branch |
changeset 58145 | bc54ed8d908a |
parent 57467 | src/jdk.jfr/share/classes/jdk/jfr/consumer/ConstantMap.java@de154169948b |
child 58197 | 0ef79bd7fb5c |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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||
58145
bc54ed8d908a
Move implementation into jdk.jfr.internal.consumer
egahlin
parents:
57467
diff
changeset
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package jdk.jfr.internal.consumer; |
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import jdk.jfr.internal.LongMap; |
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/** |
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* Holds mapping between a set of keys and their corresponding object. |
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* |
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* If the type is a known type, i.e. {@link RecordedThread}, an |
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* {@link ObjectFactory} can be supplied which will instantiate a typed object. |
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*/ |
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final class ConstantMap { |
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private static final int RESOLUTION_FINISHED = 0; |
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private static final int RESOLUTION_STARTED = 1; |
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public static final ConstantMap EMPTY = new ConstantMap(); |
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// A temporary placeholder, so objects can |
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// reference themselves (directly, or indirectly), |
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// when making a transition from numeric id references |
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// to normal Java references. |
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private final static class Reference { |
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private final long key; |
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private final ConstantMap pool; |
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Reference(ConstantMap pool, long key) { |
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this.pool = pool; |
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this.key = key; |
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} |
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Object resolve() { |
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return pool.get(key); |
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} |
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public String toString() { |
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return "ref: " + pool.name + "[" + key + "]"; |
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} |
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} |
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final ObjectFactory<?> factory; |
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final String name; |
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private final LongMap<Object> objects; |
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private boolean resolving; |
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private boolean allResolved; |
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private ConstantMap() { |
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this(null, "<empty>"); |
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allResolved = true; |
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} |
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ConstantMap(ObjectFactory<?> factory, String name) { |
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this.name = name; |
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this.objects = new LongMap<>(2); |
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this.factory = factory; |
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} |
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Object get(long id) { |
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// fast path, all objects in pool resolved |
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if (allResolved) { |
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return objects.get(id); |
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} |
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// referenced from a pool, deal with this later |
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if (!resolving) { |
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return new Reference(this, id); |
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} |
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// should always have a value |
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Object value = objects.get(id); |
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if (value == null) { |
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// unless is 0 which is used to represent null |
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if (id == 0) { |
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return null; |
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} |
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throw new InternalError("Missing object id=" + id + " in pool " + name + ". All ids should reference object"); |
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} |
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// id is resolved (but not the whole pool) |
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if (objects.isSetId(id, RESOLUTION_FINISHED)) { |
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return value; |
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} |
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// resolving ourself, abort to avoid infinite recursion |
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if (objects.isSetId(id, RESOLUTION_STARTED)) { |
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return null; |
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} |
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// mark id as STARTED if we should |
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// come back during object resolution |
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objects.setId(id, RESOLUTION_STARTED); |
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// resolve object! |
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Object resolved = resolve(value); |
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// mark id as FINISHED |
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objects.setId(id, RESOLUTION_FINISHED); |
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// if a factory exists, convert to RecordedThread. |
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// RecordedClass etc. and store back results |
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if (factory != null) { |
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Object factorized = factory.createObject(id, resolved); |
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objects.put(id, factorized); |
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return factorized; |
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} else { |
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objects.put(id, resolved); |
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return resolved; |
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} |
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} |
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private static Object resolve(Object o) { |
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if (o instanceof Reference) { |
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return resolve(((Reference) o).resolve()); |
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} |
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if (o != null && o.getClass().isArray()) { |
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final Object[] array = (Object[]) o; |
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for (int i = 0; i < array.length; i++) { |
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Object element = array[i]; |
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array[i] = resolve(element); |
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} |
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return array; |
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} |
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return o; |
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} |
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public void resolve() { |
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objects.forEachKey(k -> get(k)); |
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} |
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public void put(long key, Object value) { |
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objects.put(key, value); |
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} |
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public void setResolving() { |
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resolving = true; |
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allResolved = false; |
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} |
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public void setResolved() { |
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allResolved = true; |
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resolving = false; |
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} |
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public String getName() { |
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return name; |
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} |
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public Object getResolved(long id) { |
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return objects.get(id); |
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} |
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public void putResolved(long id, Object object) { |
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objects.put(id, object); |
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objects.setId(id, RESOLUTION_FINISHED); |
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} |
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public void setAllResolved(boolean allResolved) { |
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this.allResolved = allResolved; |
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} |
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public boolean isResolved(long id) { |
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if (objects.hasKey(id)) { |
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return objects.isSetId(id, RESOLUTION_FINISHED); |
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} |
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return false; |
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} |
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} |