//Generic query method returning a IList<KeyValuePair<Guid, T>>
public static async Task <IList <KeyValuePair <Guid, T> > > QueryReliableDictionaryKeyValuePairList <T>(Microsoft.ServiceFabric.Data.IReliableStateManager stateManager,
string reliableDictionaryName,
Func <T, bool> filter)
{
var result = new List <KeyValuePair <Guid, T> >();
IReliableDictionary <Guid, T> reliableDictionary =
await stateManager.GetOrAddAsync <IReliableDictionary <Guid, T> >(reliableDictionaryName);
using (var tx = stateManager.CreateTransaction())
{
Microsoft.ServiceFabric.Data.IAsyncEnumerable <KeyValuePair <Guid, T> > asyncEnumerable =
await reliableDictionary.CreateEnumerableAsync(tx);
using (Microsoft.ServiceFabric.Data.IAsyncEnumerator <KeyValuePair <Guid, T> > asyncEnumerator = asyncEnumerable.GetAsyncEnumerator())
{
while (await asyncEnumerator.MoveNextAsync(CancellationToken.None))
{
if (filter(asyncEnumerator.Current.Value))
{
result.Add(asyncEnumerator.Current);
}
}
}
}
return(result);
}
public async Task InfiniteLoop_Issue91()
{
var sut = new MockReliableStateManager();
var collection = await sut.GetOrAddAsync <IReliableDictionary2 <Guid, long> >("Collection");
using (var tx = sut.CreateTransaction())
{
var query = await collection.CreateEnumerableAsync(tx, key => false, EnumerationMode.Unordered);
var list = new List <Guid>();
//This goes into infinite loop if the query returns an empty collection with a key value pair of null for both the key and the value.
Microsoft.ServiceFabric.Data.IAsyncEnumerator <KeyValuePair <Guid, long> > asyncEnumerator = query.GetAsyncEnumerator();
while (await asyncEnumerator.MoveNextAsync(CancellationToken.None))
{
list.Add(asyncEnumerator.Current.Key);
}
await tx.CommitAsync();
}
Assert.IsTrue(true, "Seems to work.");
//Assert.Fail("Shouldn't reach here.");
}
public static async Task ForEach <T>(
[NotNull] this Microsoft.ServiceFabric.Data.IAsyncEnumerable <T> enumerable,
CancellationToken token,
[NotNull][InstantHandle] Action <T> block)
{
if (enumerable == null)
{
throw new ArgumentNullException(nameof(enumerable));
}
if (block == null)
{
throw new ArgumentNullException(nameof(block));
}
using (Microsoft.ServiceFabric.Data.IAsyncEnumerator <T> enumerator = enumerable.GetAsyncEnumerator())
{
while (await enumerator.MoveNextAsync(token))
{
block(enumerator.Current);
}
}
}
public async Task <IEnumerable <Product.Model.Product> > GetAllProducts()
{
IReliableDictionary <Guid, Product.Model.Product> products = await
_stateManager.GetOrAddAsync <IReliableDictionary <Guid, Product.Model.Product> >("products");
var result = new List <Product.Model.Product>();
using (ITransaction tx = _stateManager.CreateTransaction())
{
Microsoft.ServiceFabric.Data.IAsyncEnumerable <KeyValuePair <Guid, Product.Model.Product> > allProducts = await
products.CreateEnumerableAsync(tx, EnumerationMode.Unordered);
using (Microsoft.ServiceFabric.Data.IAsyncEnumerator <KeyValuePair <Guid, Product.Model.Product> > enumerator = allProducts.GetAsyncEnumerator())
{
while (await enumerator.MoveNextAsync(CancellationToken.None))
{
KeyValuePair <Guid, Product.Model.Product> current = enumerator.Current;
result.Add(current.Value);
}
}
}
return(result);
}
public static async Task ForEach <TKey, TValue>(
[NotNull] this Microsoft.ServiceFabric.Data.IAsyncEnumerable <KeyValuePair <TKey, TValue> > enumerable,
CancellationToken token,
[NotNull][InstantHandle] Func <TKey, TValue, Task> block)
{
if (enumerable == null)
{
throw new ArgumentNullException(nameof(enumerable));
}
if (block == null)
{
throw new ArgumentNullException(nameof(block));
}
using (Microsoft.ServiceFabric.Data.IAsyncEnumerator <KeyValuePair <TKey, TValue> > enumerator = enumerable.GetAsyncEnumerator())
{
while (await enumerator.MoveNextAsync(token))
{
KeyValuePair <TKey, TValue> pair = enumerator.Current;
await block(pair.Key, pair.Value);
}
}
}