001/* 002 * BridJ - Dynamic and blazing-fast native interop for Java. 003 * http://bridj.googlecode.com/ 004 * 005 * Copyright (c) 2010-2013, Olivier Chafik (http://ochafik.com/) 006 * All rights reserved. 007 * 008 * Redistribution and use in source and binary forms, with or without 009 * modification, are permitted provided that the following conditions are met: 010 * 011 * * Redistributions of source code must retain the above copyright 012 * notice, this list of conditions and the following disclaimer. 013 * * Redistributions in binary form must reproduce the above copyright 014 * notice, this list of conditions and the following disclaimer in the 015 * documentation and/or other materials provided with the distribution. 016 * * Neither the name of Olivier Chafik nor the 017 * names of its contributors may be used to endorse or promote products 018 * derived from this software without specific prior written permission. 019 * 020 * THIS SOFTWARE IS PROVIDED BY OLIVIER CHAFIK AND CONTRIBUTORS ``AS IS'' AND ANY 021 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 022 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 023 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY 024 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 025 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 026 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 027 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 028 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 029 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 030 */ 031package org.bridj; 032 033import org.bridj.CRuntime.MethodCallInfoBuilder; 034import org.bridj.ann.Convention; 035import java.lang.reflect.Constructor; 036import java.lang.reflect.Method; 037 038import static org.bridj.Pointer.*; 039 040/** 041 * Factory that is able to create dynamic functions bindings with a given 042 * signature 043 */ 044public class DynamicFunctionFactory { 045 046 final Constructor<? extends DynamicFunction> constructor; 047 final Method method; 048 final long callbackHandle; 049 050 DynamicFunctionFactory(Class<? extends DynamicFunction> callbackClass, Method method, /*Convention.Style style,*/ MethodCallInfoBuilder methodCallInfoBuilder) { 051 try { 052 this.constructor = callbackClass.getConstructor(); 053 this.method = method; 054 055 MethodCallInfo mci = methodCallInfoBuilder.apply(method); 056 callbackHandle = JNI.bindJavaToCCallbacks(mci); 057 } catch (Throwable th) { 058 th.printStackTrace(); 059 throw new RuntimeException("Failed to instantiate callback" + " : " + th, th); 060 } 061 } 062 063 @Override 064 protected void finalize() throws Throwable { 065 if (BridJ.debugNeverFree) { 066 return; 067 } 068 069 JNI.freeJavaToCCallbacks(callbackHandle, 1); 070 } 071 072 public DynamicFunction newInstance(Pointer<?> functionPointer) { 073 if (functionPointer == null) { 074 return null; 075 } 076 077 try { 078 DynamicFunction dcb = constructor.newInstance(); 079 dcb.peer = (Pointer) functionPointer; 080 dcb.method = method; 081 dcb.factory = this; 082 083 return dcb; 084 } catch (Throwable th) { 085 th.printStackTrace(); 086 throw new RuntimeException("Failed to instantiate callback" + " : " + th, th); 087 } 088 } 089 090 @Override 091 public String toString() { 092 return getClass().getSimpleName() + "(" + method + ")"; 093 } 094}