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[Truffle] volatile and thread-safe global constants
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19 changes: 19 additions & 0 deletions
19
truffle/src/main/java/org/jruby/truffle/language/globals/GlobalVariableStorage.java
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/* | ||
* Copyright (c) 2015, 2016 Oracle and/or its affiliates. All rights reserved. This | ||
* code is released under a tri EPL/GPL/LGPL license. You can use it, | ||
* redistribute it and/or modify it under the terms of the: | ||
* | ||
* Eclipse Public License version 1.0 | ||
* GNU General Public License version 2 | ||
* GNU Lesser General Public License version 2.1 | ||
*/ | ||
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package org.jruby.truffle.language.globals; | ||
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public class GlobalVariableStorage { | ||
public volatile Object value; | ||
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GlobalVariableStorage(Object value) { | ||
this.value = value; | ||
} | ||
} |
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69
truffle/src/main/java/org/jruby/truffle/language/globals/GlobalVariables.java
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/* | ||
* Copyright (c) 2015, 2016 Oracle and/or its affiliates. All rights reserved. This | ||
* code is released under a tri EPL/GPL/LGPL license. You can use it, | ||
* redistribute it and/or modify it under the terms of the: | ||
* | ||
* Eclipse Public License version 1.0 | ||
* GNU General Public License version 2 | ||
* GNU Lesser General Public License version 2.1 | ||
*/ | ||
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package org.jruby.truffle.language.globals; | ||
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import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary; | ||
import com.oracle.truffle.api.object.DynamicObject; | ||
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import java.util.ArrayList; | ||
import java.util.Collection; | ||
import java.util.concurrent.ConcurrentHashMap; | ||
import java.util.concurrent.ConcurrentMap; | ||
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public class GlobalVariables { | ||
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private final DynamicObject defaultValue; | ||
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ConcurrentMap<String, GlobalVariableStorage> variables; | ||
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public GlobalVariables(DynamicObject defaultValue) { | ||
this.defaultValue = defaultValue; | ||
this.variables = new ConcurrentHashMap<>(); | ||
} | ||
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public Object getOrDefault(String key, Object defaultValue) { | ||
final Object v; | ||
return ((v = get(key)) != null) ? v : defaultValue; | ||
} | ||
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public Object get(String key) { | ||
return getStorage(key).value; | ||
} | ||
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@TruffleBoundary | ||
public GlobalVariableStorage getStorage(String key) { | ||
final GlobalVariableStorage currentStorage = variables.get(key); | ||
if (currentStorage == null) { | ||
final GlobalVariableStorage newStorage = new GlobalVariableStorage(defaultValue); | ||
final GlobalVariableStorage wasStorage = variables.putIfAbsent(key, newStorage); | ||
return (wasStorage == null) ? newStorage : wasStorage; | ||
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} else { | ||
return currentStorage; | ||
} | ||
} | ||
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public void put(String key, Object value) { | ||
getStorage(key).value = value; | ||
} | ||
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public Collection<DynamicObject> dynamicObjectValues() { | ||
final Collection<GlobalVariableStorage> storages = variables.values(); | ||
final ArrayList<DynamicObject> values = new ArrayList<>(storages.size()); | ||
for (GlobalVariableStorage storage : storages) { | ||
final Object value = storage.value; | ||
if (value instanceof DynamicObject) { | ||
values.add((DynamicObject) value); | ||
} | ||
} | ||
return values; | ||
} | ||
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} |
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oldStorage
orpreviousStorage
would be better I think.