com.newtranx.util.mysql.fabric.SpringMybatisSetQueryTablesAspect.java Source code

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Here is the source code for com.newtranx.util.mysql.fabric.SpringMybatisSetQueryTablesAspect.java

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/*
 * Copyright 2016 NewTranx Co. Ltd.
 *
 * 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 com.newtranx.util.mysql.fabric;

import java.lang.reflect.Method;
import java.util.Arrays;

import org.apache.ibatis.session.SqlSession;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.mysql.fabric.jdbc.FabricMySQLConnection;
import com.newtranx.util.aop.AspectJUtils;

@Component
@Aspect
public class SpringMybatisSetQueryTablesAspect {

    private static final Logger log = LogManager.getLogger(SpringMybatisSetQueryTablesAspect.class);

    @Autowired
    private SqlSession sqlSession;

    @Around("@annotation(com.newtranx.util.mysql.fabric.QueryTables)")
    public Object setQueryTables(ProceedingJoinPoint pjp) throws Throwable {
        try {
            Method method = AspectJUtils.getMethod(pjp);
            QueryTables qtAnnotation = method.getAnnotation(QueryTables.class);
            FabricMySQLConnection connection = (FabricMySQLConnection) sqlSession.getConnection();
            if ((connection.getQueryTables().isEmpty() && connection.getShardTable() == null)
                    || qtAnnotation.reset()) {
                connection.clearServerSelectionCriteria();
                String[] tables = qtAnnotation.value();
                log.debug("Setting queryTables=" + Arrays.toString(tables));
                log.debug("Thread=" + Thread.currentThread() + ", conn=" + connection);
                if (qtAnnotation.useFirst()) {
                    log.debug("Use setShardTable with first query table instead");
                    connection.setShardTable(tables[0]);
                    log.debug("New shardTable set");
                } else {
                    for (String table : tables)
                        connection.addQueryTable(table);
                    log.debug("New queryTables set");
                }
            } else {
                log.debug("Keep original queryTables");
            }
            log.debug("QueryTables=" + connection.getQueryTables() + ", shardTable=" + connection.getShardTable());
        } catch (Exception e) {
            e.printStackTrace(System.err);
            throw e;
        }
        return pjp.proceed();
    }

}