--- a/src/jdk.jfr/share/classes/jdk/jfr/consumer/ConstantMap.java Fri May 17 15:53:21 2019 +0200
+++ b/src/jdk.jfr/share/classes/jdk/jfr/consumer/ConstantMap.java Fri May 17 16:02:27 2019 +0200
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2019, 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
@@ -25,9 +25,6 @@
package jdk.jfr.consumer;
-import java.util.ArrayList;
-import java.util.List;
-
/**
* Holds mapping between a set of keys and their corresponding object.
*
@@ -35,6 +32,15 @@
* {@link ObjectFactory} can be supplied which will instantiate a typed object.
*/
final class ConstantMap {
+
+ private static final int RESOLUTION_FINISHED = 0;
+ private static final int RESOLUTION_STARTED = 1;
+ public static final ConstantMap EMPTY = new ConstantMap();
+
+ // A temporary placeholder, so objects can
+ // reference themselves (directly, or indirectly),
+ // when making a transition from numeric id references
+ // to normal Java references.
private final static class Reference {
private final long key;
private final ConstantMap pool;
@@ -47,18 +53,28 @@
Object resolve() {
return pool.get(key);
}
+
+ public String toString() {
+ return "ref: " + pool.name + "[" + key + "]";
+ }
}
- private final ObjectFactory<?> factory;
+ final ObjectFactory<?> factory;
+ final String name;
+
private final LongMap<Object> objects;
- private LongMap<Boolean> isResolving;
+ private boolean resolving;
private boolean allResolved;
- private String name;
+
+ private ConstantMap() {
+ this(null, "<empty>");
+ allResolved = true;
+ }
ConstantMap(ObjectFactory<?> factory, String name) {
this.name = name;
- this.objects = new LongMap<>();
+ this.objects = new LongMap<>(2);
this.factory = factory;
}
@@ -68,26 +84,42 @@
return objects.get(id);
}
// referenced from a pool, deal with this later
- if (isResolving == null) {
+ if (!resolving) {
return new Reference(this, id);
}
- Boolean beingResolved = isResolving.get(id);
+ // should always have a value
+ Object value = objects.get(id);
+ if (value == null) {
+ // unless is 0 which is used to represent null
+ if (id == 0) {
+ return null;
+ }
+ throw new InternalError("Missing object id=" + id + " in pool " + name + ". All ids should reference object");
+ }
- // we are resolved (but not the whole pool)
- if (Boolean.FALSE.equals(beingResolved)) {
- return objects.get(id);
+ // id is resolved (but not the whole pool)
+ if (objects.isSetId(id, RESOLUTION_FINISHED)) {
+ return value;
}
// resolving ourself, abort to avoid infinite recursion
- if (Boolean.TRUE.equals(beingResolved)) {
+ if (objects.isSetId(id, RESOLUTION_STARTED)) {
return null;
}
- // resolve me!
- isResolving.put(id, Boolean.TRUE);
- Object resolved = resolve(objects.get(id));
- isResolving.put(id, Boolean.FALSE);
+ // mark id as STARTED if we should
+ // come back during object resolution
+ objects.setId(id, RESOLUTION_STARTED);
+
+ // resolve object!
+ Object resolved = resolve(value);
+
+ // mark id as FINISHED
+ objects.setId(id, RESOLUTION_FINISHED);
+
+ // if a factory exists, convert to RecordedThread.
+ // RecordedClass etc. and store back results
if (factory != null) {
Object factorized = factory.createObject(id, resolved);
objects.put(id, factorized);
@@ -105,7 +137,8 @@
if (o != null && o.getClass().isArray()) {
final Object[] array = (Object[]) o;
for (int i = 0; i < array.length; i++) {
- array[i] = resolve(array[i]);
+ Object element = array[i];
+ array[i] = resolve(element);
}
return array;
}
@@ -113,27 +146,44 @@
}
public void resolve() {
- List<Long> keyList = new ArrayList<>();
- objects.keys().forEachRemaining(keyList::add);
- for (Long l : keyList) {
- get(l);
- }
+ objects.forEachKey(k -> get(k));
}
public void put(long key, Object value) {
objects.put(key, value);
}
- public void setIsResolving() {
- isResolving = new LongMap<>();
+ public void setResolving() {
+ resolving = true;
+ allResolved = false;
}
public void setResolved() {
allResolved = true;
- isResolving = null; // pool finished, release memory
+ resolving = false;
}
public String getName() {
return name;
}
+
+ public Object getResolved(long id) {
+ return objects.get(id);
+ }
+
+ public void putResolved(long id, Object object) {
+ objects.setId(id, RESOLUTION_FINISHED);
+ objects.put(id, object);
+ }
+
+ public void setAllResolved(boolean allResolved) {
+ this.allResolved = allResolved;
+ }
+
+ public boolean isResolved(long id) {
+ if (objects.hasKey(id)) {
+ return objects.isSetId(id, RESOLUTION_FINISHED);
+ }
+ return false;
+ }
}