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ConnectionProxy.java
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ConnectionProxy.java
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/*
* Copyright 1999-2019 Seata.io Group.
*
* 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 io.seata.rm.datasource;
import com.alibaba.druid.util.JdbcConstants;
import java.sql.Connection;
import java.sql.SQLException;
import io.seata.config.ConfigurationFactory;
import io.seata.core.constants.ConfigurationKeys;
import io.seata.core.exception.TransactionException;
import io.seata.core.exception.TransactionExceptionCode;
import io.seata.core.model.BranchStatus;
import io.seata.core.model.BranchType;
import io.seata.rm.DefaultResourceManager;
import io.seata.rm.datasource.exec.LockConflictException;
import io.seata.rm.datasource.undo.SQLUndoLog;
import io.seata.rm.datasource.undo.UndoLogManager;
import io.seata.rm.datasource.undo.UndoLogManagerOracle;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* The type Connection proxy.
*
* @author sharajava
*/
public class ConnectionProxy extends AbstractConnectionProxy {
private static final Logger LOGGER = LoggerFactory.getLogger(ConnectionProxy.class);
private ConnectionContext context = new ConnectionContext();
private static final int DEFAULT_REPORT_RETRY_COUNT = 5;
private static int REPORT_RETRY_COUNT = ConfigurationFactory.getInstance().getInt(
ConfigurationKeys.CLIENT_REPORT_RETRY_COUNT, DEFAULT_REPORT_RETRY_COUNT);
/**
* Instantiates a new Connection proxy.
*
* @param dataSourceProxy the data source proxy
* @param targetConnection the target connection
*/
public ConnectionProxy(DataSourceProxy dataSourceProxy, Connection targetConnection) {
super(dataSourceProxy, targetConnection);
}
/**
* Gets context.
*
* @return the context
*/
public ConnectionContext getContext() {
return context;
}
/**
* Bind.
*
* @param xid the xid
*/
public void bind(String xid) {
context.bind(xid);
}
/**
* set global lock requires flag
*
* @param isLock whether to lock
*/
public void setGlobalLockRequire(boolean isLock) {
context.setGlobalLockRequire(isLock);
}
/**
* get global lock requires flag
*/
public boolean isGlobalLockRequire() {
return context.isGlobalLockRequire();
}
/**
* Check lock.
*
* @param lockKeys the lockKeys
* @throws SQLException the sql exception
*/
public void checkLock(String lockKeys) throws SQLException {
// Just check lock without requiring lock by now.
try {
boolean lockable = DefaultResourceManager.get().lockQuery(BranchType.AT,
getDataSourceProxy().getResourceId(), context.getXid(), lockKeys);
if (!lockable) {
throw new LockConflictException();
}
} catch (TransactionException e) {
recognizeLockKeyConflictException(e);
}
}
/**
* Register.
*
* @param lockKeys the lockKeys
* @throws SQLException the sql exception
*/
public void register(String lockKeys) throws SQLException {
// Just check lock without requiring lock by now.
try {
DefaultResourceManager.get().branchRegister(BranchType.AT, getDataSourceProxy().getResourceId(), null,
context.getXid(), null, lockKeys);
} catch (TransactionException e) {
recognizeLockKeyConflictException(e);
}
}
private void recognizeLockKeyConflictException(TransactionException te) throws SQLException {
if (te.getCode() == TransactionExceptionCode.LockKeyConflict) {
throw new LockConflictException();
} else {
throw new SQLException(te);
}
}
/**
* append sqlUndoLog
*
* @param sqlUndoLog the sql undo log
*/
public void appendUndoLog(SQLUndoLog sqlUndoLog) {
context.appendUndoItem(sqlUndoLog);
}
/**
* append lockKey
*
* @param lockKey the lock key
*/
public void appendLockKey(String lockKey) {
context.appendLockKey(lockKey);
}
@Override
public void commit() throws SQLException {
if (context.inGlobalTransaction()) {
processGlobalTransactionCommit();
} else if (context.isGlobalLockRequire()) {
processLocalCommitWithGlobalLocks();
} else {
targetConnection.commit();
}
}
private void processLocalCommitWithGlobalLocks() throws SQLException {
checkLock(context.buildLockKeys());
try {
targetConnection.commit();
} catch (Throwable ex) {
throw new SQLException(ex);
}
context.reset();
}
private void processGlobalTransactionCommit() throws SQLException {
try {
register();
} catch (TransactionException e) {
recognizeLockKeyConflictException(e);
}
try {
if (context.hasUndoLog()) {
if(JdbcConstants.ORACLE.equalsIgnoreCase(this.getDbType())) {
UndoLogManagerOracle.flushUndoLogs(this);
} else {
UndoLogManager.flushUndoLogs(this);
}
}
targetConnection.commit();
} catch (Throwable ex) {
report(false);
if (ex instanceof SQLException) {
throw new SQLException(ex);
}
}
report(true);
context.reset();
}
private void register() throws TransactionException {
Long branchId = DefaultResourceManager.get().branchRegister(BranchType.AT, getDataSourceProxy().getResourceId(),
null, context.getXid(), null, context.buildLockKeys());
context.setBranchId(branchId);
}
@Override
public void rollback() throws SQLException {
targetConnection.rollback();
if (context.inGlobalTransaction()) {
if (context.isBranchRegistered()) {
report(false);
}
}
context.reset();
}
@Override
public void setAutoCommit(boolean autoCommit) throws SQLException {
if ((autoCommit) && !getAutoCommit()) {
// change autocommit from false to true, we should commit() first according to JDBC spec.
commit();
}
targetConnection.setAutoCommit(autoCommit);
}
private void report(boolean commitDone) throws SQLException {
int retry = REPORT_RETRY_COUNT;
while (retry > 0) {
try {
DefaultResourceManager.get().branchReport(BranchType.AT, context.getXid(), context.getBranchId(),
(commitDone ? BranchStatus.PhaseOne_Done : BranchStatus.PhaseOne_Failed), null);
return;
} catch (Throwable ex) {
LOGGER.error("Failed to report [" + context.getBranchId() + "/" + context.getXid() + "] commit done ["
+ commitDone + "] Retry Countdown: " + retry);
retry--;
if (retry == 0) {
throw new SQLException("Failed to report branch status " + commitDone, ex);
}
}
}
}
}