PreparedStatementExecutorWrapper.java

/*
 * Copyright 1999-2015 dangdang.com.
 * <p>
 * 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.
 * </p>
 */

package com.dangdang.ddframe.rdb.sharding.executor.wrapper;

import com.dangdang.ddframe.rdb.sharding.executor.event.DMLExecutionEvent;
import com.dangdang.ddframe.rdb.sharding.executor.event.DQLExecutionEvent;
import com.dangdang.ddframe.rdb.sharding.router.SQLExecutionUnit;
import com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import lombok.Getter;

import java.sql.PreparedStatement;
import java.util.ArrayList;
import java.util.List;

/**
 * 预编译语句对象的执行上下文.
 * 
 * @author zhangliang
 */
public class PreparedStatementExecutorWrapper extends AbstractExecutorWrapper {
    
    @Getter
    private final PreparedStatement preparedStatement;
    
    private final Optional<DMLExecutionEvent> dmlExecutionEvent;
    
    private final Optional<DQLExecutionEvent> dqlExecutionEvent;
    
    @Getter
    private final List<Integer[]> batchIndices = new ArrayList<>();
    
    private int batchIndex;
    
    public PreparedStatementExecutorWrapper(final PreparedStatement preparedStatement, final List<Object> parameters,
                                            final SQLExecutionUnit sqlExecutionUnit) {
        super(sqlExecutionUnit);
        this.preparedStatement = preparedStatement;
        if (isDML()) {
            dmlExecutionEvent = Optional.of(new DMLExecutionEvent(getSqlExecutionUnit().getDataSource(), getSqlExecutionUnit().getSql(), Lists.newArrayList(parameters)));
            dqlExecutionEvent = Optional.absent();
        } else if (isDQL()) {
            dqlExecutionEvent = Optional.of(new DQLExecutionEvent(getSqlExecutionUnit().getDataSource(), getSqlExecutionUnit().getSql(), Lists.newArrayList(parameters)));
            dmlExecutionEvent = Optional.absent();
        } else {
            dmlExecutionEvent = Optional.absent();
            dqlExecutionEvent = Optional.absent();
        }
    }
    
    @Override
    public Optional<DMLExecutionEvent> getDMLExecutionEvent() {
        return dmlExecutionEvent;
    }
    
    @Override
    public Optional<DQLExecutionEvent> getDQLExecutionEvent() {
        return dqlExecutionEvent;
    }
    
    /**
     * 增加批量参数.
     * 
     * @param parameters 参数列表
     */
    public void addBatchParameters(final List<Object> parameters) {
        Preconditions.checkArgument(isDML() && dmlExecutionEvent.isPresent());
        dmlExecutionEvent.get().addBatchParameters(Lists.newArrayList(parameters));
    }
    
    /**
     * 映射批量执行索引.
     * 将{@linkplain com.dangdang.ddframe.rdb.sharding.jdbc.ShardingPreparedStatement}批量执行索引映射为真实的{@linkplain PreparedStatement}批量执行索引.
     * 
     * @param shardingBatchIndex 分片批量执行索引
     */
    public void mapBatchIndex(final int shardingBatchIndex) {
        batchIndices.add(new Integer[]{shardingBatchIndex, this.batchIndex++});
    }
}