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package org.boretti.drools.integration.drools5.implementation; |
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import java.lang.annotation.Annotation; |
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import java.lang.reflect.InvocationHandler; |
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import java.lang.reflect.Method; |
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import java.util.ArrayList; |
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import java.util.Collection; |
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import java.util.Iterator; |
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import java.util.List; |
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import java.util.Map; |
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import java.util.concurrent.ExecutorService; |
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import java.util.concurrent.Executors; |
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import java.util.concurrent.Future; |
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import org.apache.log4j.Logger; |
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import org.boretti.drools.integration.drools5.DroolsInterface; |
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import org.boretti.drools.integration.drools5.DroolsParameterHandling; |
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import org.boretti.drools.integration.drools5.DroolsSessionType; |
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import org.boretti.drools.integration.drools5.annotations.DroolsMethod; |
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import org.boretti.drools.integration.drools5.annotations.DroolsParameter; |
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import org.boretti.drools.integration.drools5.annotations.DroolsVariable; |
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import org.boretti.drools.integration.drools5.exceptions.IncompatibleAnnotationDroolsError; |
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class DroolsProxy<T> implements InvocationHandler { |
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49 | 110 | private final Logger logger = Logger.getLogger(this.getClass()); |
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51 | 288 | private static class ProductFactResult { |
52 | 144 | private List<Object> fact= new ArrayList<Object>(); |
53 | 144 | private Class<?> returnType=null; |
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public List<Object> getFact() { |
59 | 236 | return fact; |
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} |
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public void setFact(List<Object> fact) { |
65 | 0 | this.fact = fact; |
66 | 0 | } |
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public Class<?> getReturnType() { |
71 | 154 | return returnType; |
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} |
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public void setReturnType(Class<?> returnType) { |
77 | 6 | this.returnType = returnType; |
78 | 6 | } |
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} |
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private ProductFactResult produceFact(Method m,Object[] args) { |
82 | 144 | ProductFactResult pfr = new ProductFactResult(); |
83 | 144 | if (args==null) return pfr; |
84 | 84 | if (args.length==0) return pfr; |
85 | 84 | Annotation[][] ass = m.getParameterAnnotations(); |
86 | 178 | for(int i=0;i<args.length;i++) { |
87 | 94 | Annotation[] as = ass[i]; |
88 | 94 | DroolsParameterHandling handling = DroolsParameterHandling.NONE; |
89 | 94 | for(Annotation a:as) { |
90 | 20 | if (a.annotationType().equals(DroolsParameter.class)) { |
91 | 20 | handling = ((DroolsParameter)a).handling(); |
92 | 20 | break; |
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} |
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} |
95 | 94 | if (handling==null) handling = DroolsParameterHandling.NONE; |
96 | 94 | if (DroolsParameterHandling.NONE.equals(handling)) { |
97 | 74 | pfr.getFact().add(args[i]); |
98 | 20 | } else if (DroolsParameterHandling.IGNORED.equals(handling)) { |
99 | 18 | } else if (DroolsParameterHandling.GENERICDEFINITION.equals(handling)) { |
100 | 6 | if (args[i] instanceof Class) pfr.setReturnType((Class<?>)args[i]); |
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else { |
102 | 0 | String msg = "GenericDefinition can only be used on Class parameter"; |
103 | 0 | logger.error(msg); |
104 | 0 | throw new IncompatibleAnnotationDroolsError(msg); |
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} |
106 | 12 | } else if (DroolsParameterHandling.TOFLAT1.equals(handling)) { |
107 | 8 | if (args[i] instanceof Object[]) for(Object o:(Object[])args[i]) pfr.getFact().add(o); |
108 | 4 | else if (args[i] instanceof Collection) for(Object o:(Collection<?>)args[i]) pfr.getFact().add(o); |
109 | 2 | else pfr.getFact().add(args[i]); |
110 | 4 | } else if (DroolsParameterHandling.TOFLATALL.equals(handling)) { |
111 | 4 | addFlat(pfr.getFact(),args[i]); |
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} |
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} |
114 | 84 | return pfr; |
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} |
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private void addFlat(List<Object> fact,Object args) { |
118 | 20 | if (args instanceof Object[]) for(Object o:(Object[])args) addFlat(fact,o); |
119 | 14 | else if (args instanceof Collection) for(Object o:(Collection<?>)args) addFlat(fact,o); |
120 | 10 | else fact.add(args); |
121 | 20 | } |
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@Override |
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public Object invoke(final Object proxy, final Method method, final Object[] args) |
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throws Throwable { |
132 | 174 | if (method.getDeclaringClass().equals(clazz)) { |
133 | 172 | DroolsMethod annotation = null; |
134 | 172 | DroolsVariable variable = null; |
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try { |
136 | 172 | annotation = method.getAnnotation(DroolsMethod.class); |
137 | 172 | } catch (NullPointerException ex) {} |
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try { |
139 | 172 | variable = method.getAnnotation(DroolsVariable.class); |
140 | 172 | } catch (NullPointerException ex) {} |
141 | 172 | if (annotation!=null && variable!=null) { |
142 | 2 | String msg ="Method is annotated with both @DroolsMethod and @DroolsVariable."; |
143 | 2 | logger.error(msg); |
144 | 2 | throw new IncompatibleAnnotationDroolsError(msg); |
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} |
146 | 170 | if (variable!=null) { |
147 | 26 | String methodName = method.getName(); |
148 | 26 | if (!methodName.startsWith("set")) { |
149 | 2 | String msg ="Method is annotated with @DroolsVariable and name is not set<something>."; |
150 | 2 | logger.error(msg); |
151 | 2 | throw new IncompatibleAnnotationDroolsError(msg); |
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} |
153 | 24 | if (method.getParameterTypes().length!=1) { |
154 | 2 | String msg ="Method is annotated with @DroolsVariable and name is set<something>, but number of parameter is not 1."; |
155 | 2 | logger.error(msg); |
156 | 2 | throw new IncompatibleAnnotationDroolsError(msg); |
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} |
158 | 22 | if (!method.getReturnType().equals(Void.TYPE)) { |
159 | 2 | String msg ="Method is annotated with @DroolsVariable and name is set<something> and number of parameter is 1, but return type is not void."; |
160 | 2 | logger.error(msg); |
161 | 2 | throw new IncompatibleAnnotationDroolsError(msg); |
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} |
163 | 20 | String fieldName = methodName.substring(3,4).toLowerCase()+methodName.substring(4); |
164 | 20 | Object data = args[0]; |
165 | 20 | Map<String,DroolsVariableImplementation> fields = inter.getFields(); |
166 | 20 | if (data==null) { |
167 | 4 | if (logger.isDebugEnabled()) logger.debug("Received parameter is null. Retracting field for next call"); |
168 | 4 | if (fields.containsKey(fieldName)) fields.remove(fieldName); |
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} else { |
170 | 16 | fields.put(fieldName, new DroolsVariableImplementation(variable.global(), data)); |
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} |
172 | 20 | return null; |
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} else { |
174 | 144 | Class<?> c = method.getReturnType(); |
175 | 144 | DroolsSessionType session = DroolsSessionType.NONE; |
176 | 144 | if (annotation!=null && annotation.session()!=null) session = annotation.session(); |
177 | 144 | ProductFactResult facts = produceFact(method,args); |
178 | 144 | List<Object> fact = facts.getFact(); |
179 | 144 | if (c.equals(Future.class)) { |
180 | 4 | if (facts.getReturnType()!=null) c=facts.getReturnType(); |
181 | 4 | DroolsFutureTask<T> dft = new DroolsFutureTask<T>(this, proxy,(facts.getReturnType()!=null)?c:null, method, session, args,fact); |
182 | 4 | executors.execute(dft); |
183 | 4 | return dft; |
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} |
185 | 140 | if (facts.getReturnType()!=null) c=facts.getReturnType(); |
186 | 140 | return invokeInternal(proxy,method,c,session,args,fact); |
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} |
188 | 2 | } else if (method.getDeclaringClass().equals(DroolsInterface.class)) { |
189 | 2 | return method.invoke(inter, args); |
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} |
191 | 0 | String msg = "Unable to handle the received parameter"; |
192 | 0 | logger.error(msg); |
193 | 0 | throw new IllegalArgumentException(msg); |
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} |
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public Object invokeInternal(Object proxy, Method method, Class<?> returnType,DroolsSessionType session, Object[] args,List<Object> fact) |
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throws Throwable { |
198 | 144 | Iterator<?> result=null; |
199 | 144 | if (DroolsSessionType.NONE.equals(session)) { |
200 | 80 | result = inter.runStatelessSession(fact); |
201 | 64 | } else if (DroolsSessionType.NEW.equals(session)) { |
202 | 16 | if (inter.getCurrentSession()!=null) { |
203 | 2 | inter.getCurrentSession().halt(); |
204 | 2 | inter.setCurrentSession(null); |
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} |
206 | 16 | result=inter.runStatefulSession(fact, false); |
207 | 48 | } else if (DroolsSessionType.END.equals(session)) { |
208 | 10 | result=inter.runStatefulSession(fact, true); |
209 | 8 | inter.getCurrentSession().halt(); |
210 | 8 | inter.setCurrentSession(null); |
211 | 38 | } else if (DroolsSessionType.JOIN.equals(session)) { |
212 | 16 | if (inter.getCurrentSession()==null) result = inter.runStatelessSession(fact); |
213 | 10 | else result = inter.runStatefulSession(fact, true); |
214 | 22 | } else if (DroolsSessionType.REQUIRE.equals(session)) { |
215 | 22 | result = inter.runStatefulSession(fact, true); |
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} |
217 | 138 | return inter.getResult(returnType, result); |
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} |
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private Class<T> clazz; |
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private DroolsInterfaceImplementation<T> inter; |
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224 | 110 | public DroolsProxy(Class<T> clazz,DroolsInterfaceImplementation<T> inter) { |
225 | 110 | this.clazz=clazz; |
226 | 110 | this.inter=inter; |
227 | 110 | } |
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229 | 2 | private static final ExecutorService executors = Executors.newCachedThreadPool(); |
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} |