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package org.apache.hivemind.lib.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.rmi.RemoteException;
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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.hivemind.ApplicationRuntimeException;
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import org.apache.hivemind.ServiceImplementationFactory;
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import org.apache.hivemind.impl.BaseLocatable;
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import org.apache.hivemind.internal.Module;
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import org.apache.hivemind.lib.NameLookup;
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import org.apache.hivemind.lib.RemoteExceptionCoordinator;
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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.ClassFactory;
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import org.apache.hivemind.service.MethodSignature;
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public class EJBProxyFactory extends BaseLocatable implements ServiceImplementationFactory
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{
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private NameLookup _nameLookup;
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private RemoteExceptionCoordinator _coordinator;
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private ClassFactory _classFactory;
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3
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public Object createCoreServiceImplementation(
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String serviceId,
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Class serviceInterface,
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Log serviceLog,
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Module invokingModule,
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List parameters)
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{
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EJBProxyParameters proxyParameters = (EJBProxyParameters) parameters.get(0);
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3
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String jndiName = proxyParameters.getJndiName();
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String homeInterfaceClassName = proxyParameters.getHomeInterfaceClassName();
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Class homeInterface = invokingModule.getClassResolver().findClass(homeInterfaceClassName);
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String proxyClassName = ClassFabUtils.generateClassName("EJBProxy");
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ClassFab classFab =
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_classFactory.newClass(proxyClassName, AbstractEJBProxy.class, invokingModule);
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classFab.addInterface(serviceInterface);
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classFab.addField("_remote", serviceInterface);
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addClearCachedMethod(classFab);
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addLookupMethod(classFab, homeInterface, serviceInterface, jndiName);
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addServiceMethods(classFab, serviceInterface, serviceId, jndiName);
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addConstructor(classFab);
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Class proxyClass = classFab.createClass();
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return invokeConstructor(proxyClass, proxyParameters.getNameLookup(_nameLookup));
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}
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private void addClearCachedMethod(ClassFab classFab)
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{
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classFab.addMethod(
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Modifier.PROTECTED,
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new MethodSignature(void.class, "_clearCachedReferences", null, null),
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"_remote = null;");
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}
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private void addLookupMethod(
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ClassFab classFab,
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Class homeInterface,
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Class remoteInterface,
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String jndiName)
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{
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String homeInterfaceName = homeInterface.getName();
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BodyBuilder builder = new BodyBuilder();
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builder.begin();
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builder.addln("if (_remote != null)");
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builder.addln(" return _remote;");
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builder.add(homeInterfaceName);
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builder.add(" home = (");
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builder.add(homeInterfaceName);
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builder.add(") _lookup(");
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builder.addQuoted(jndiName);
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builder.addln(");");
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builder.add("try");
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builder.begin();
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builder.add("_remote = home.create();");
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builder.end();
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builder.add("catch (javax.ejb.CreateException ex)");
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builder.begin();
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builder.add("throw new java.rmi.RemoteException(ex.getMessage(), ex);");
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builder.end();
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builder.add("return _remote;");
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builder.end();
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classFab.addMethod(
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Modifier.SYNCHRONIZED + Modifier.PRIVATE,
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new MethodSignature(
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remoteInterface,
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"_lookupRemote",
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null,
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new Class[] { RemoteException.class }),
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builder.toString());
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}
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private void addServiceMethods(
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ClassFab classFab,
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Class serviceInterface,
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String serviceId,
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String jndiName)
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{
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Method[] methods = serviceInterface.getMethods();
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boolean toString = false;
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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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addServiceMethod(classFab, m);
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toString |= ClassFabUtils.isToString(m);
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}
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if (!toString)
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addToStringMethod(classFab, serviceInterface, serviceId, jndiName);
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}
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private void addServiceMethod(ClassFab classFab, Method m)
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{
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String methodName = m.getName();
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boolean isVoid = m.getReturnType().equals(Void.TYPE);
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BodyBuilder builder = new BodyBuilder();
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builder.begin();
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builder.addln("boolean first = true;");
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builder.add("while (true)");
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builder.begin();
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builder.add("try");
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builder.begin();
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if (!isVoid)
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builder.add("return ");
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builder.add("_lookupRemote().");
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builder.add(methodName);
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builder.addln("($$);");
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if (isVoid)
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builder.addln("return;");
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builder.end();
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builder.add("catch (java.rmi.RemoteException ex)");
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builder.begin();
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200
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builder.addln("if (first)");
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builder.begin();
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203
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builder.addln("_handleRemoteException(ex);");
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builder.addln("first = false;");
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builder.end();
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builder.addln("else");
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builder.add(" throw ex;");
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builder.end();
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builder.end();
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builder.end();
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213
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classFab.addMethod(Modifier.PUBLIC, new MethodSignature(m), builder.toString());
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}
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216
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3
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private void addToStringMethod(
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ClassFab classFab,
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Class serviceInterface,
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String serviceId,
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String jndiName)
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{
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3
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ClassFabUtils.addToStringMethod(
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classFab,
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ImplMessages.ejbProxyDescription(serviceId, serviceInterface, jndiName));
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225
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}
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226
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227
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3
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private void addConstructor(ClassFab classFab)
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{
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229
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3
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classFab.addConstructor(
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new Class[] { NameLookup.class, RemoteExceptionCoordinator.class },
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231
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null,
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232
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"super($1, $2);");
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233
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}
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234
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|
235
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3
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private Object invokeConstructor(Class proxyClass, NameLookup nameLookup)
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236
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{
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237
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3
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try
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238
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{
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239
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3
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Constructor c =
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240
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proxyClass.getConstructor(
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241
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new Class[] { NameLookup.class, RemoteExceptionCoordinator.class });
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242
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243
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3
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return c.newInstance(new Object[] { nameLookup, _coordinator });
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244
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}
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245
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catch (Exception ex)
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246
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{
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247
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0
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throw new ApplicationRuntimeException(ex);
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248
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}
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249
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}
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250
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|
251
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3
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public void setClassFactory(ClassFactory factory)
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252
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{
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253
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3
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_classFactory = factory;
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254
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}
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255
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|
256
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3
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public void setCoordinator(RemoteExceptionCoordinator coordinator)
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257
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{
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258
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3
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_coordinator = coordinator;
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259
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}
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260
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|
261
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3
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public void setNameLookup(NameLookup lookup)
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262
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{
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263
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3
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_nameLookup = lookup;
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264
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}
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265
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266
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}
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267
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