/*
* Licensed to Crate under one or more contributor license agreements.
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership. Crate 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial
* agreement.
*/
package io.crate.metadata;
import io.crate.action.sql.SessionContext;
import org.joda.time.DateTimeUtils;
/**
* TransactionContext is a context that is used to keep state which is valid during a transaction.
*
* In Crate a transaction is always bound to the lifecycle of a single query/statement execution as there is no
* transaction support.
*/
public class TransactionContext {
private final SessionContext sessionContext;
private Long currentTimeMillis = null;
public TransactionContext(SessionContext sessionContext) {
this.sessionContext = sessionContext;
}
/**
* @return current timestamp in ms. Subsequent calls will always return the same value. (Not thread-safe)
*/
public long currentTimeMillis() {
if (currentTimeMillis == null) {
// no synchronization because StmtCtx is mostly used during single-threaded analysis phase
currentTimeMillis = DateTimeUtils.currentTimeMillis();
}
return currentTimeMillis;
}
public SessionContext sessionContext() {
return sessionContext;
}
}