org.mayanjun.mybatisx.dal.handler.AnnotationBasedAutoDiscoveryProcessor Maven / Gradle / Ivy

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/*
 * Copyright 2016-2018 mayanjun.org
 *
 * Licensed 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.mayanjun.mybatisx.dal.handler;

import org.mayanjun.mybatisx.dal.util.ClassUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.annotation.Annotation;
import java.util.*;

/**
 * AnnotationBasedAutoDiscoveryProcessor
 *
 * @author mayanjun(9/20/16)
 */
public abstract class AnnotationBasedAutoDiscoveryProcessor extends SpringAutoDiscoveryProcessor {

	private static final Logger LOG = LoggerFactory.getLogger(AnnotationBasedAutoDiscoveryProcessor.class);

	@Override
	protected List findHandlers(Class type) {
		Set ps = packageSet();
		List handlers = new ArrayList();

		Map beans = this.applicationContext.getBeansWithAnnotation(type);

		if(beans != null && !beans.isEmpty()) {
			Iterator> iterator = beans.entrySet().iterator();
			while (iterator.hasNext()) {
				Map.Entry entry = iterator.next();
				Object bean = entry.getValue();
				if(ps != null) {
					String pkg = bean.getClass().getPackage().getName();
					if(!ps.contains(pkg)) {
						LOG.info("Handler is not in the specified packages so that it will be ignored:this={} beanId={}, handler={}", this.getClass().getSimpleName(), entry.getKey(),  bean.getClass().getSimpleName());
						continue;
					}
				}
				T handler;
				try {
					handler = (T) bean;
					Class realHandlerType = ClassUtils.getFirstParameterizedType(this.getClass());
					if(realHandlerType.isAssignableFrom(handler.getClass())) {
						handlers.add(handler);
						LOG.info("Handler found: this={}, beanId={}, handler={}", this.getClass().getSimpleName(), entry.getKey(), bean.getClass().getSimpleName());
					} else {
						LOG.warn("Handler type mismatch: this={}, beanId={}, handler={}", this.getClass().getSimpleName(), entry.getKey(), bean.getClass().getSimpleName());
					}
				} catch (ClassCastException e) {
					LOG.warn("Handler type mismatch and this handler({}) will be discarded: {}", bean.getClass().getSimpleName(), e.getMessage());
				}
			}
		}
		return handlers;
	}
}