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FLocal/Patcher/Data/Patch/AtomicPatch.cs

69 lines
2.0 KiB

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
using System.Xml.Schema;
using Patcher.Data.Command;
using Patcher.DB;
namespace Patcher.Data.Patch
{
class AtomicPatch : AbstractPatch
{
private readonly AbstractCommand[] commands;
private readonly bool isStrictCommandSet;
public AtomicPatch(AbstractCommand[] commands, bool isStrictCommandSet, HashSet<string> restrictToEnvironments, Context context) : base(restrictToEnvironments, context)
{
this.commands = commands;
this.isStrictCommandSet = isStrictCommandSet;
}
private void CheckDbDriver()
{
if(!this.isStrictCommandSet)
{
if(!context.DbDriver.IsDDLTransactional)
{
throw new ApplicationException("You should use strictCommandSet when working with non-DDL-transactional DB");
}
}
}
public override XDocument Apply(Transaction transaction)
{
this.CheckDbDriver();
List<XElement> rollbackInfos = new List<XElement>();
for(int i=0; i<this.commands.Length; i++)
{
IEnumerable<XElement> commandRollbackInfoContent;
if (commands[i] is AbstractPersistentCommand)
{
commandRollbackInfoContent = ((AbstractPersistentCommand)commands[i]).Apply(transaction, true);
} else
{
commandRollbackInfoContent = commands[i].Apply(transaction);
}
rollbackInfos.Add(new XElement("command", new XAttribute("num", i), commandRollbackInfoContent));
}
return new XDocument(new XElement("rollbackInfo", rollbackInfos.ToArray()));
}
public override void Rollback(Transaction transaction, XDocument rollbackInfo)
{
this.CheckDbDriver();
for(int i=this.commands.Length-1; i>=0; i--)
{
commands[i].Rollback(transaction, (from commandRollbackInfo in rollbackInfo.Root.Elements("command") where commandRollbackInfo.Attribute("num").Value == i.ToString() select commandRollbackInfo).Single());
}
}
}
}