/
Capacity.java
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/
Capacity.java
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/*
* $Id$
*
* SARL is an general-purpose agent programming language.
* More details on http://www.sarl.io
*
* Copyright (C) 2014-2017 the original authors or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.sarl.lang.core;
/** Root type for all the capacities in the SARL language.
*
* @author $Author: srodriguez$
* @version $FullVersion$
* @mavengroupid $GroupId$
* @mavenartifactid $ArtifactId$
*/
public interface Capacity {
/** Wrapper to a capacity that enable to manage and provide the caller to the capacity function.
*
* @param <C> the type of the wrapper capacity.
* @author $Author: sgalland$
* @version $FullVersion$
* @mavengroupid $GroupId$
* @mavenartifactid $ArtifactId$
* @since 0.5
*/
abstract class ContextAwareCapacityWrapper<C extends Capacity> implements Capacity {
private static final ThreadLocal<Object> CALLER = new ThreadLocal<>();
/** The wrapped capacity.
*/
protected final C capacity;
private final Object caller;
/** Constructor.
*
* @param capacity the wrapped capacity.
* @param caller the owner of the wrapper, that should be the caller of the capacity's function.
*/
public ContextAwareCapacityWrapper(C capacity, Object caller) {
assert capacity != null;
this.capacity = capacity;
this.caller = caller;
}
/** Ensure that the local-thread variable stores the caller.
*/
protected final void ensureCallerInLocalThread() {
CALLER.set(this.caller);
}
/** Reset the local-thread variable storing the caller.
*/
@SuppressWarnings("static-method")
protected final void resetCallerInLocalThread() {
CALLER.remove();
}
/** Replies the caller of the capacity functions.
*
* @return the caller, or {@code null} if no caller is registered.
*/
public static final Object getCaller() {
return CALLER.get();
}
}
}