/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache license, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the license for the specific language governing permissions and
* limitations under the license.
*/
package org.apache.logging.log4j.samples.app;
import org.apache.logging.log4j.EventLogger;
import org.apache.logging.log4j.message.StructuredDataMessage;
import org.apache.logging.log4j.samples.dto.AuditEvent;
import org.apache.logging.log4j.samples.dto.Constraint;
import org.apache.logging.log4j.samples.util.NamingUtils;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
/**
*
*/
public class LogEventFactory {
@SuppressWarnings("unchecked")
public static <T extends AuditEvent> T getEvent(final Class<T> intrface) {
final String eventId = NamingUtils.lowerFirst(intrface.getSimpleName());
final StructuredDataMessage msg = new StructuredDataMessage(eventId, null, "Audit");
return (T)Proxy.newProxyInstance(intrface
.getClassLoader(), new Class<?>[]{intrface}, new AuditProxy(msg, intrface));
}
private static class AuditProxy implements InvocationHandler {
private final StructuredDataMessage msg;
private final Class intrface;
public AuditProxy(final StructuredDataMessage msg, final Class intrface) {
this.msg = msg;
this.intrface = intrface;
}
@Override
public Object invoke(final Object o, final Method method, final Object[] objects)
throws Throwable {
if (method.getName().equals("logEvent")) {
final StringBuilder missing = new StringBuilder();
final Method[] methods = intrface.getMethods();
for (final Method _method : methods) {
final String name = NamingUtils.lowerFirst(NamingUtils
.getMethodShortName(_method.getName()));
final Annotation[] annotations = _method.getDeclaredAnnotations();
for (final Annotation annotation : annotations) {
final Constraint constraint = (Constraint) annotation;
if (constraint.required() && msg.get(name) == null) {
if (missing.length() > 0) {
missing.append(", ");
}
missing.append(name);
}
}
}
if (missing.length() > 0) {
throw new IllegalStateException("Event " + msg.getId().getName() +
" is missing required attributes " + missing);
}
EventLogger.logEvent(msg);
}
if (method.getName().equals("setCompletionStatus")) {
final String name = NamingUtils.lowerFirst(NamingUtils.getMethodShortName(method.getName()));
msg.put(name, objects[0].toString());
}
if (method.getName().startsWith("set")) {
final String name = NamingUtils.lowerFirst(NamingUtils.getMethodShortName(method.getName()));
/*
* Perform any validation here. Currently the catalog doesn't
* contain any information on validation rules.
*/
msg.put(name, objects[0].toString());
}
return null;
}
}
}