/*
* Copyright 2011 The Apache Software Foundation
*
* 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.lealone.command;
import java.io.IOException;
import java.util.ArrayList;
import org.lealone.engine.SessionRemote;
import org.lealone.expression.ParameterInterface;
import org.lealone.message.DbException;
import org.lealone.result.ResultInterface;
import org.lealone.value.Transfer;
import org.lealone.value.Value;
public class FrontendBatchCommand implements CommandInterface {
private SessionRemote session;
private ArrayList<Transfer> transferList;
private ArrayList<String> batchCommands; //对应JdbcStatement.executeBatch()
private ArrayList<Value[]> batchParameters; //对应JdbcPreparedStatement.executeBatch()
private int id = -1;
private int[] result;
public FrontendBatchCommand(SessionRemote session, ArrayList<Transfer> transferList, ArrayList<String> batchCommands) {
this.session = session;
this.transferList = transferList;
this.batchCommands = batchCommands;
}
public FrontendBatchCommand(SessionRemote session, ArrayList<Transfer> transferList, CommandInterface preparedCommand,
ArrayList<Value[]> batchParameters) {
this.session = session;
this.transferList = transferList;
this.batchParameters = batchParameters;
if (preparedCommand instanceof CommandRemote)
id = ((CommandRemote) preparedCommand).getId();
}
@Override
public int getCommandType() {
return UNKNOWN;
}
@Override
public boolean isQuery() {
return false;
}
@Override
public ArrayList<? extends ParameterInterface> getParameters() {
throw DbException.throwInternalError();
}
@Override
public ResultInterface executeQuery(int maxRows, boolean scrollable) {
throw DbException.throwInternalError();
}
@Override
public int executeUpdate() {
if (id == -1)
id = session.getNextId();
for (int i = 0, count = 0; i < transferList.size(); i++) {
try {
Transfer transfer = transferList.get(i);
if (batchCommands != null) {
session.traceOperation("COMMAND_EXECUTE_BATCH_UPDATE_STATEMENT", id);
transfer.writeInt(SessionRemote.COMMAND_EXECUTE_BATCH_UPDATE_STATEMENT);
int size = batchCommands.size();
result = new int[size];
transfer.writeInt(size);
for (int j = 0; j < size; j++)
transfer.writeString(batchCommands.get(j));
session.done(transfer);
for (int j = 0; j < size; j++)
result[j] = transfer.readInt();
} else {
session.traceOperation("COMMAND_EXECUTE_BATCH_UPDATE_PREPAREDSTATEMENT", id);
transfer.writeInt(SessionRemote.COMMAND_EXECUTE_BATCH_UPDATE_PREPAREDSTATEMENT).writeInt(id);
int size = batchParameters.size();
result = new int[size];
transfer.writeInt(size);
Value[] values;
int len;
for (int j = 0; j < size; j++) {
values = batchParameters.get(j);
len = values.length;
for (int m = 0; m < len; m++)
transfer.writeValue(values[m]);
}
session.done(transfer);
for (int j = 0; j < size; j++)
result[j] = transfer.readInt();
}
} catch (IOException e) {
session.removeServer(e, i--, ++count);
}
}
return 0;
}
@Override
public void close() {
if (session == null || session.isClosed()) {
return;
}
session = null;
//不能clear，否则把SessionRemote中的transferList也clear了，
//会导致JdbcSQLException: Database is already closed
//transferList.clear();
transferList = null;
if (batchCommands != null) {
batchCommands.clear();
batchCommands = null;
}
if (batchParameters != null) {
batchParameters.clear();
batchParameters = null;
}
result = null;
}
@Override
public void cancel() {
session.cancelStatement(id);
}
@Override
public ResultInterface getMetaData() {
throw DbException.throwInternalError();
}
public int[] getResult() {
return result;
}
}