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Provides Database/XML Replication through JPA
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package de.tsl2.nano.replication;
import java.io.Serializable;
import java.lang.reflect.InvocationTargetException;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import de.tsl2.nano.replication.util.ULog;
import de.tsl2.nano.replication.util.Util;
public class JndiLookup {
private static final String JNDI_PROPERTIES = "jndi.properties";
private InitialContext initialContext;
private String prefix;
private InitialContext initialContext() {
if (initialContext == null) {
prefix = Util.getProperty("jndi.prefix", null, "(example: ejb:/myapplication/) in your system properties!");
initialContext = createInitialContext();
}
return initialContext;
}
private static InitialContext createInitialContext() {
ClassLoader origin = null;
try {
origin = Util.linkResourcePath(JNDI_PROPERTIES, EntityReplication.CONFIG_DIR + JNDI_PROPERTIES);
return new InitialContext();
} catch (NamingException e) {
throw new RuntimeException(e);
} finally {
if (origin != null)
Thread.currentThread().setContextClassLoader(origin);
}
}
public T lookup(Class bean, Class interfaze) {
return lookup(bean.getSimpleName() + "!" + interfaze.getCanonicalName());
}
public T lookup(Class clazz) {
return lookup(clazz.getCanonicalName());
}
@SuppressWarnings("unchecked")
public T lookup(String name) {
try {
return (T) ULog.call(name, () -> initialContext().lookup(prefix + name));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
@SuppressWarnings({ "rawtypes", "unchecked" })
public static FindByIdAccess createSessionBeanFromJndi() {
ULog.log("creating EJBSession-Bean through jndi...", false);
String jndiBean = Util.getProperty("jndi.sessionbean", null, "for a jndi lookup");
String jndiInterface = Util.getProperty("jndi.sessioninterface", null, " for a jndi lookup");
JndiLookup jndiLookup = new JndiLookup();
Class beanCls, beanInterface;
try {
beanCls = Thread.currentThread().getContextClassLoader().loadClass(jndiBean);
beanInterface = Thread.currentThread().getContextClassLoader().loadClass(jndiInterface);
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
Serializable ejbBean = (Serializable) jndiLookup.lookup(beanCls, beanInterface);
String jndiFinder = Util.getProperty("jndi.find.method", null, " for a jndi lookup");
return jndiLookup.new FindByIdAccess(ejbBean, jndiFinder);
}
public class FindByIdAccess {
private Serializable bean;
private String methodName;
public FindByIdAccess(Serializable bean, String methodName) {
ULog.log("defining jndi-session-call: " + bean + "." + methodName);
this.bean = bean;
this.methodName = methodName;
}
@SuppressWarnings("unchecked")
public T call(Class cls, Serializable id) {
long start = System.currentTimeMillis();
try {
ULog.log("remote jndi call on " + methodName + "() with id: " + id, false);
return (T) bean.getClass().getMethod(methodName, new Class[] {String.class}).invoke(bean, id);
} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException
| NoSuchMethodException | SecurityException e) {
ULog.log("\n" + e.toString());
return (T) Util.handleException(e);
} finally {
ULog.log(" " + (System.currentTimeMillis() - start) + " ms");
}
}
}
}
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