|
public GetLeaseAndRead ( bool shouldexist = false ) : Task |
||
| shouldexist | bool | |
| return | Task |
|
public async Task GetIndexAndLock()
{
var filelock = new FileIndexLock(CloudStorageAccount.Parse(this.connection), this.container, "lock.txt");
var filelock2 = new FileIndexLock(CloudStorageAccount.Parse(this.connection), this.container, "lock.txt");
await filelock.CreateIfNotExist();
await filelock.GetLeaseAndRead();
await filelock2.GetLeaseAndRead();
await Task.Delay(2000);
await filelock.Release();
}
public async Task WriteContent(string name, byte[] content, long expectedStreamVersion, int retry = 0)
{
this.index = new FileIndexLock(storage, container, options.NamingPolicy.GetIndexPath(name));
try
{
//if (expectedStreamVersion == 0)
//{
// await this.index.CreateIfNotExist();
// await this.masterindex.CreateIfNotExist();
//}
var canWrite = await index.GetLeaseAndRead(expectedStreamVersion != 0);
if (!canWrite)
{
if (retry < options.RetryPolicy.Length)
{
await Task.Delay(retry);
await this.WriteContent(name, content, expectedStreamVersion, retry ++);
return;
}
await this.index.CreateIfNotExist();
await this.index.ReadIndex();
throw new AppendOnlyTimeoutException(expectedStreamVersion, index.OrderedIndex.Any() ? this.index.ReadLast().Version : 0, name);
}
await this.index.ReadIndex();
var last = index.ReadLast();
if ((last == null && expectedStreamVersion != 0) || (last != null && expectedStreamVersion != last.Version) || (last != null && last.Version != expectedStreamVersion))
{
throw new AppendOnlyStoreConcurrencyException(expectedStreamVersion, last?.Version ?? 0, name);
}
var blobcache = GetStreamCache(name);
if (last == null)
{
//no file, create the stream to append to...
await blobcache.CreateOrReplaceAsync();
}
var master = this.GetMasterCache();
using (var memstream = new MemoryStream())
{
var record = new FileRecord(content, name, expectedStreamVersion + 1);
record.WriteContentToStream(memstream);
var mybytes = memstream.ToArray();
var appendmaster = Task.Run(async() =>
{
using (var masterstream = new MemoryStream(memstream.ToArray()))
{
await master.AppendBlockAsync(masterstream);
}
});
var up1 = blobcache.AppendFromByteArrayAsync(mybytes, 0, mybytes.Length);
var up3 = index.AppendWrite(record, blobcache.Name);
var up4 = masterindex.AppendWrite(record, blobcache.Name);
await index.EnsureLease();
if (!options.DisableMasterIndex)
{
await Task.WhenAll(up1, appendmaster, up3);
}
else
{
await Task.WhenAll(up4, up1, appendmaster, up3);
}
}
}
finally
{
await index.Release();
}
}
public async Task WriteContent(string name, byte[] content, long expectedStreamVersion, int retry = 0)
{
this.index = new FileIndexLock(storage, container, options.NamingPolicy.GetIndexPath(name));
try
{
//if (expectedStreamVersion == 0)
//{
// await this.index.CreateIfNotExist();
// await this.masterindex.CreateIfNotExist();
//}
var canWrite = await index.GetLeaseAndRead(expectedStreamVersion != 0);
if (!canWrite)
{
if (retry < options.RetryPolicy.Length)
{
await Task.Delay(retry);
await this.WriteContent(name, content, expectedStreamVersion, retry++);
return;
}
await this.index.CreateIfNotExist();
await this.index.ReadIndex();
throw new AppendOnlyTimeoutException(expectedStreamVersion, index.OrderedIndex.Any() ? this.index.ReadLast().Version : 0, name);
}
await this.index.ReadIndex();
var last = index.ReadLast();
if ((last == null && expectedStreamVersion != 0) || (last != null && expectedStreamVersion != last.Version) || (last != null && last.Version != expectedStreamVersion ))
{
throw new AppendOnlyStoreConcurrencyException(expectedStreamVersion, last?.Version ?? 0, name);
}
var blobcache = GetStreamCache(name);
if (last == null)
{
//no file, create the stream to append to...
await blobcache.CreateOrReplaceAsync();
}
var master = this.GetMasterCache();
using (var memstream = new MemoryStream())
{
var record = new FileRecord(content, name, expectedStreamVersion + 1);
record.WriteContentToStream(memstream);
var mybytes = memstream.ToArray();
var appendmaster = Task.Run(async () =>
{
using (var masterstream = new MemoryStream(memstream.ToArray()))
{
await master.AppendBlockAsync(masterstream);
}
});
var up1 = blobcache.AppendFromByteArrayAsync(mybytes, 0, mybytes.Length);
var up3 = index.AppendWrite(record, blobcache.Name);
var up4 = masterindex.AppendWrite(record, blobcache.Name);
await index.EnsureLease();
if (!options.DisableMasterIndex)
{
await Task.WhenAll(up1, appendmaster, up3);
}
else
{
await Task.WhenAll(up4, up1, appendmaster, up3);
}
}
}
finally
{
await index.Release();
}
}
