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AbstractInvoker.java
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AbstractInvoker.java
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/***** BEGIN LICENSE BLOCK *****
* Version: CPL 1.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Common Public
* License Version 1.0 (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.eclipse.org/legal/cpl-v10.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Copyright (C) 2008 JRuby project
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the CPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the CPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****/
package org.jruby.ext.ffi;
import java.util.Collections;
import java.util.Map;
import java.util.WeakHashMap;
import org.jruby.Ruby;
import org.jruby.RubyClass;
import org.jruby.RubyModule;
import org.jruby.anno.JRubyClass;
import org.jruby.anno.JRubyMethod;
import org.jruby.internal.runtime.methods.DynamicMethod;
import org.jruby.runtime.Arity;
import org.jruby.runtime.ObjectAllocator;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
/**
* A native function invoker
*/
@JRubyClass(name = "FFI::" + AbstractInvoker.CLASS_NAME, parent = "Object")
public abstract class AbstractInvoker extends Pointer {
static final String CLASS_NAME = "AbstractInvoker";
/**
* Reference map to keep libraries open for as long as there is a method mapped
* to that library.
*/
private static final Map<DynamicMethod, AbstractInvoker> refmap
= Collections.synchronizedMap(new WeakHashMap<DynamicMethod, AbstractInvoker>());
/**
* The arity of this function.
*/
protected final Arity arity;
public static RubyClass createAbstractInvokerClass(Ruby runtime, RubyModule module) {
RubyClass result = module.defineClassUnder(CLASS_NAME,
module.fastGetClass("Pointer"),
ObjectAllocator.NOT_ALLOCATABLE_ALLOCATOR);
result.defineAnnotatedMethods(AbstractInvoker.class);
result.defineAnnotatedConstants(AbstractInvoker.class);
return result;
}
/**
* Creates a new <tt>AbstractInvoker</tt> instance.
* @param arity
*/
protected AbstractInvoker(Ruby runtime, RubyClass klass, int arity, DirectMemoryIO io) {
super(runtime, klass, io, 0);
this.arity = Arity.fixed(arity);
}
/**
* Attaches this function to a ruby module or class.
*
* @param module The module or class to attach the function to.
* @param methodName The ruby name to attach the function as.
*/
@JRubyMethod(name="attach")
public IRubyObject attach(ThreadContext context, IRubyObject obj, IRubyObject methodName) {
DynamicMethod m = createDynamicMethod(obj.getSingletonClass());
obj.getSingletonClass().addMethod(methodName.asJavaString(), m);
if (obj instanceof RubyModule) {
((RubyModule) obj).addMethod(methodName.asJavaString(), m);
}
refmap.put(m, this);
return this;
}
protected abstract DynamicMethod createDynamicMethod(RubyModule module);
/**
* Returns the {@link org.jruby.runtime.Arity} of this function.
*
* @return The <tt>Arity</tt> of the native function.
*/
public final Arity getArity() {
return arity;
}
}