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package org.apache.hivemind.service.impl;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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import java.util.Iterator;
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import java.util.List;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hivemind.InterceptorStack;
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import org.apache.hivemind.methodmatch.MethodMatcher;
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import org.apache.hivemind.service.BodyBuilder;
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import org.apache.hivemind.service.ClassFab;
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import org.apache.hivemind.service.ClassFabUtils;
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import org.apache.hivemind.service.MethodContribution;
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import org.apache.hivemind.service.MethodFab;
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import org.apache.hivemind.service.MethodSignature;
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public class LoggingInterceptorFactory extends AbstractServiceInterceptorFactory
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{
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protected void createInfrastructure(InterceptorStack stack, ClassFab classFab, List parameters)
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{
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Class topClass = stack.peek().getClass();
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classFab.addField("_inner", topClass);
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classFab.addConstructor(
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new Class[] { Log.class, topClass },
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null,
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"{ super($1); _inner = $2; }");
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}
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protected Object instantiateInterceptor(
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InterceptorStack stack,
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Class interceptorClass,
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List parameters)
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throws Exception
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{
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Object stackTop = stack.peek();
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Log log = LogFactory.getLog(stack.getServiceExtensionPointId());
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Constructor c = interceptorClass.getConstructors()[0];
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return c.newInstance(new Object[] { log, stackTop });
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}
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private void addPassThruMethodImplementation(ClassFab classFab, MethodSignature sig)
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{
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BodyBuilder builder = new BodyBuilder();
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builder.begin();
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if (sig.getReturnType() != void.class)
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builder.add("return ");
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builder.add("_inner.");
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builder.add(sig.getName());
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builder.addln("($$);");
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builder.end();
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classFab.addMethod(Modifier.PUBLIC, sig, builder.toString());
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}
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protected void addServiceMethodImplementation(ClassFab classFab, MethodSignature sig)
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{
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Class returnType = sig.getReturnType();
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String methodName = sig.getName();
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boolean isVoid = (returnType == void.class);
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BodyBuilder builder = new BodyBuilder();
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builder.begin();
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builder.addln("boolean debug = _isDebugEnabled();");
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builder.addln("if (debug)");
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builder.add(" _logEntry(");
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builder.addQuoted(methodName);
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builder.addln(", $args);");
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if (!isVoid)
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{
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builder.add(ClassFabUtils.getJavaClassName(returnType));
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builder.add(" result = ");
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}
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builder.add("_inner.");
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builder.add(methodName);
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builder.addln("($$);");
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if (isVoid)
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{
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builder.addln("if (debug)");
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builder.add(" _logVoidExit(");
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builder.addQuoted(methodName);
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builder.addln(");");
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}
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else
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{
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builder.addln("if (debug)");
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builder.add(" _logExit(");
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builder.addQuoted(methodName);
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builder.addln(", ($w)result);");
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builder.addln("return result;");
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}
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builder.end();
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MethodFab methodFab = classFab.addMethod(Modifier.PUBLIC, sig, builder.toString());
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builder.clear();
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builder.begin();
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builder.add("_logException(");
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builder.addQuoted(methodName);
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builder.addln(", $e);");
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builder.addln("throw $e;");
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builder.end();
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String body = builder.toString();
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Class[] exceptions = sig.getExceptionTypes();
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int count = exceptions.length;
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for (int i = 0; i < count; i++)
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{
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methodFab.addCatch(exceptions[i], body);
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}
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methodFab.addCatch(RuntimeException.class, body);
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}
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protected Class getInterceptorSuperclass()
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{
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return AbstractLoggingInterceptor.class;
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}
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protected void addServiceMethods(InterceptorStack stack, ClassFab fab, List parameters)
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{
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boolean toString = false;
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Method[] methods = stack.getServiceInterface().getMethods();
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MethodMatcher matcher = buildMethodMatcher(parameters);
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for (int i = 0; i < methods.length; i++)
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{
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Method m = methods[i];
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MethodSignature sig = new MethodSignature(m);
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if (includeMethod(matcher, sig))
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addServiceMethodImplementation(fab, sig);
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else
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1
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addPassThruMethodImplementation(fab, sig);
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toString |= ClassFabUtils.isToString(m);
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}
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if (!toString)
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addToStringMethod(stack, fab);
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}
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7
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private MethodMatcher buildMethodMatcher(List parameters)
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{
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MethodMatcher result = null;
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201
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7
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Iterator i = parameters.iterator();
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7
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while (i.hasNext())
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{
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2
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MethodContribution mc = (MethodContribution) i.next();
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206
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2
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if (result == null)
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1
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result = new MethodMatcher();
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result.put(mc.getMethodPattern(), mc);
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}
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7
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return result;
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}
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215
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14
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private boolean includeMethod(MethodMatcher matcher, MethodSignature sig)
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{
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14
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if (matcher == null)
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11
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return true;
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220
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3
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MethodContribution mc = (MethodContribution) matcher.get(sig);
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222
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3
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return mc == null || mc.getInclude();
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}
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224
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}
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