public async Task RemoveFromStart(ITransaction tx, string key, int countToRemove = 1)
{
var metadata = await GetMetadataAsync(tx, key).ConfigureAwait(false);
var from = metadata.From;
var count = metadata.Count;
if (countToRemove > count)
{
throw new InvalidOperationException($"Trying to remove {countToRemove} entries from {_name} with only {count} messages");
}
for (var i = 0; i < countToRemove; i++)
{
var listKey = new ReliableListKey {
Key = key, Id = from
};
await _valueStore.TryRemoveAsync(tx, listKey).ConfigureAwait(false);
from++;
count--;
}
var updatedMetadata = new ReliableListMetaData {
From = from, Count = count
};
await UpdateMetadataAsync(tx, key, updatedMetadata).ConfigureAwait(false);
}
public AsyncEnumerable(ITransaction tx, string key, ReliableListMetaData metadata, ReliableLists <TValue> list)
{
_tx = tx;
_key = key;
_metadata = metadata;
_list = list;
}
public async Task AddAsync(ITransaction tx, string key, TValue value)
{
var metadata = await GetMetadataAsync(tx, key).ConfigureAwait(false);
var index = metadata.From + metadata.Count;
var listKey = new ReliableListKey {
Key = key, Id = index
};
await _valueStore.SetAsync(tx, listKey, value).ConfigureAwait(false);
var updatedMetadata = new ReliableListMetaData {
From = metadata.From, Count = metadata.Count + 1
};
await UpdateMetadataAsync(tx, key, updatedMetadata).ConfigureAwait(false);
}
public async Task AddRangeAsync(ITransaction tx, string key, IEnumerable <TValue> values)
{
var metadata = await GetMetadataAsync(tx, key).ConfigureAwait(false);
var from = metadata.From;
var count = metadata.Count;
foreach (var value in values)
{
var listKey = new ReliableListKey {
Key = key, Id = from + count
};
await _valueStore.SetAsync(tx, listKey, value).ConfigureAwait(false);
count++;
}
var updatedMetadata = new ReliableListMetaData {
From = from, Count = count
};
await UpdateMetadataAsync(tx, key, updatedMetadata).ConfigureAwait(false);
}
private Task UpdateMetadataAsync(ITransaction tx, string key, ReliableListMetaData updatedMetadata) => _metadataStore.SetAsync(tx, MakeMetadataKey(key), updatedMetadata);