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/*
* 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.camel.component.mybatis;
import java.util.Iterator;
import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.support.DefaultProducer;
import org.apache.camel.support.ExchangeHelper;
import org.apache.camel.support.ObjectHelper;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.session.ExecutorType;
import org.apache.ibatis.session.SqlSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class MyBatisProducer extends DefaultProducer {
private static final Logger LOG = LoggerFactory.getLogger(MyBatisProducer.class);
private String statement;
private MyBatisEndpoint endpoint;
public MyBatisProducer(MyBatisEndpoint endpoint) {
super(endpoint);
this.endpoint = endpoint;
this.statement = endpoint.getStatement();
}
public void process(Exchange exchange) throws Exception {
SqlSession session;
ExecutorType executorType = endpoint.getExecutorType();
if (executorType == null) {
session = endpoint.getSqlSessionFactory().openSession();
} else {
session = endpoint.getSqlSessionFactory().openSession(executorType);
}
try {
switch (endpoint.getStatementType()) {
case SelectOne:
doSelectOne(exchange, session);
break;
case SelectList:
doSelectList(exchange, session);
break;
case Insert:
doInsert(exchange, session);
break;
case InsertList:
doInsertList(exchange, session);
break;
case Update:
doUpdate(exchange, session);
break;
case UpdateList:
doUpdateList(exchange, session);
break;
case Delete:
doDelete(exchange, session);
break;
case DeleteList:
doDeleteList(exchange, session);
break;
default:
throw new IllegalArgumentException("Unsupported statementType: " + endpoint.getStatementType());
}
// flush the batch statements and commit the database connection
session.commit();
} catch (Exception e) {
// discard the pending batch statements and roll the database connection back
session.rollback();
throw e;
} finally {
// and finally close the session as we're done
session.close();
}
}
private void doSelectOne(Exchange exchange, SqlSession session) throws Exception {
Object result;
Object in = getInput(exchange);
if (in != null) {
LOG.trace("SelectOne: {} using statement: {}", in, statement);
result = session.selectOne(statement, in);
} else {
LOG.trace("SelectOne using statement: {}", statement);
result = session.selectOne(statement);
}
doProcessResult(exchange, result, session);
}
private void doSelectList(Exchange exchange, SqlSession session) throws Exception {
Object result;
Object in = getInput(exchange);
if (in != null) {
LOG.trace("SelectList: {} using statement: {}", in, statement);
result = session.selectList(statement, in);
} else {
LOG.trace("SelectList using statement: {}", statement);
result = session.selectList(statement);
}
doProcessResult(exchange, result, session);
}
private void doInsert(Exchange exchange, SqlSession session) throws Exception {
Object result;
Object in = getInput(exchange);
if (in != null) {
// lets handle arrays or collections of objects
Iterator iter = ObjectHelper.createIterator(in);
while (iter.hasNext()) {
Object value = iter.next();
LOG.trace("Inserting: {} using statement: {}", value, statement);
result = session.insert(statement, value);
doProcessResult(exchange, result, session);
}
} else {
LOG.trace("Inserting using statement: {}", statement);
result = session.insert(statement);
doProcessResult(exchange, result, session);
}
}
private void doInsertList(Exchange exchange, SqlSession session) throws Exception {
Object result;
Object in = getInput(exchange);
if (in != null) {
// just pass in the body as Object and allow MyBatis to iterate using its own foreach statement
LOG.trace("Inserting: {} using statement: {}", in, statement);
result = session.insert(statement, in);
doProcessResult(exchange, result, session);
} else {
LOG.trace("Inserting using statement: {}", statement);
result = session.insert(statement);
doProcessResult(exchange, result, session);
}
}
private void doUpdate(Exchange exchange, SqlSession session) throws Exception {
Object result;
Object in = getInput(exchange);
if (in != null) {
// lets handle arrays or collections of objects
Iterator iter = ObjectHelper.createIterator(in);
while (iter.hasNext()) {
Object value = iter.next();
LOG.trace("Updating: {} using statement: {}", value, statement);
result = session.update(statement, value);
doProcessResult(exchange, result, session);
}
} else {
LOG.trace("Updating using statement: {}", statement);
result = session.update(statement);
doProcessResult(exchange, result, session);
}
}
private void doUpdateList(Exchange exchange, SqlSession session) throws Exception {
Object result;
Object in = getInput(exchange);
if (in != null) {
// just pass in the body as Object and allow MyBatis to iterate using its own foreach statement
LOG.trace("Updating: {} using statement: {}", in, statement);
result = session.update(statement, in);
doProcessResult(exchange, result, session);
} else {
LOG.trace("Updating using statement: {}", statement);
result = session.update(statement);
doProcessResult(exchange, result, session);
}
}
private void doDelete(Exchange exchange, SqlSession session) throws Exception {
Object result;
Object in = getInput(exchange);
if (in != null) {
// lets handle arrays or collections of objects
Iterator iter = ObjectHelper.createIterator(in);
while (iter.hasNext()) {
Object value = iter.next();
LOG.trace("Deleting: {} using statement: {}", value, statement);
result = session.delete(statement, value);
doProcessResult(exchange, result, session);
}
} else {
LOG.trace("Deleting using statement: {}", statement);
result = session.delete(statement);
doProcessResult(exchange, result, session);
}
}
private void doDeleteList(Exchange exchange, SqlSession session) throws Exception {
Object result;
Object in = getInput(exchange);
if (in != null) {
// just pass in the body as Object and allow MyBatis to iterate using its own foreach statement
LOG.trace("Deleting: {} using statement: {}", in, statement);
result = session.delete(statement, in);
doProcessResult(exchange, result, session);
} else {
LOG.trace("Deleting using statement: {}", statement);
result = session.delete(statement);
doProcessResult(exchange, result, session);
}
}
private void doProcessResult(Exchange exchange, Object result, SqlSession session) {
final String outputHeader = getEndpoint().getOutputHeader();
Message answer = exchange.getIn();
if (ExchangeHelper.isOutCapable(exchange)) {
answer = exchange.getOut();
// preserve headers
answer.getHeaders().putAll(exchange.getIn().getHeaders());
if (outputHeader != null) {
//if we put the MyBatis result into a header we should preserve the body as well
answer.setBody(exchange.getIn().getBody());
}
}
if (endpoint.getStatementType() == StatementType.SelectList || endpoint.getStatementType() == StatementType.SelectOne) {
// we should not set the body if its a stored procedure as the result is already in its OUT parameter
MappedStatement ms = session.getConfiguration().getMappedStatement(statement);
if (ms != null && ms.getStatementType() == org.apache.ibatis.mapping.StatementType.CALLABLE) {
if (result == null) {
LOG.trace("Setting result as existing body as MyBatis statement type is Callable, and there was no result.");
answer.setBody(exchange.getIn().getBody());
} else {
if (outputHeader != null) {
// set the result as header for insert
LOG.trace("Setting result as header [{}]: {}", outputHeader, result);
answer.setHeader(outputHeader, result);
} else {
// set the result as body for insert
LOG.trace("Setting result as body: {}", result);
answer.setBody(result);
answer.setHeader(MyBatisConstants.MYBATIS_RESULT, result);
}
}
} else {
if (outputHeader != null) {
LOG.trace("Setting result as header [{}]: {}", outputHeader, result);
answer.setHeader(outputHeader, result);
} else {
// set the result as body for insert
LOG.trace("Setting result as body: {}", result);
answer.setBody(result);
answer.setHeader(MyBatisConstants.MYBATIS_RESULT, result);
}
}
} else {
final String headerName = (outputHeader != null) ? outputHeader : MyBatisConstants.MYBATIS_RESULT;
answer.setHeader(headerName, result);
}
answer.setHeader(MyBatisConstants.MYBATIS_STATEMENT_NAME, statement);
}
@Override
public MyBatisEndpoint getEndpoint() {
return (MyBatisEndpoint) super.getEndpoint();
}
private Object getInput(final Exchange exchange) {
final String inputHeader = getEndpoint().getInputHeader();
if (inputHeader != null) {
return exchange.getIn().getHeader(inputHeader);
} else {
return exchange.getIn().getBody();
}
}
}
