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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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package jdk.jfr.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.setId(id, RESOLUTION_FINISHED);
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objects.put(id, object);
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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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}
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