public void TestCursor()
{
var cache0 = Cache().WithAsync();
cache0.WithAsync().Put(1, new QueryPerson("Ivanov", 30));
IFuture <object> res = cache0.GetFuture <object>();
res.Get();
Cache().Put(1, new QueryPerson("Ivanov", 30));
Cache().Put(1, new QueryPerson("Petrov", 40));
Cache().Put(1, new QueryPerson("Sidorov", 50));
SqlQuery qry = new SqlQuery(typeof(QueryPerson), "age >= 20");
// 1. Test GetAll().
using (IQueryCursor <ICacheEntry <int, QueryPerson> > cursor = Cache().Query(qry))
{
cursor.GetAll();
Assert.Throws <InvalidOperationException>(() => { cursor.GetAll(); });
Assert.Throws <InvalidOperationException>(() => { cursor.GetEnumerator(); });
}
// 2. Test GetEnumerator.
using (IQueryCursor <ICacheEntry <int, QueryPerson> > cursor = Cache().Query(qry))
{
cursor.GetEnumerator();
Assert.Throws <InvalidOperationException>(() => { cursor.GetAll(); });
Assert.Throws <InvalidOperationException>(() => { cursor.GetEnumerator(); });
}
}
/// <summary>
/// Invokes <see cref="IFuture{T}.Get()"/> uninterruptibly.
/// </summary>
/// <param name="future">
/// The future whose value should be get uninterruptibly.</param>
/// <returns>The result of the future computation.</returns>
/// <exception cref="ExecutionException">
/// if the computation threw an exception.
/// </exception>
/// <exception cref="OperationCanceledException">
/// If the current thread was interrupted while waiting.
/// </exception>
/// <seealso cref="IFuture{T}"/>
/// <seealso cref="IFuture{T}.Get()"/>
public static T GetUninterruptibly <T>(IFuture <T> future)
{
bool interrupted = false;
try {
while (true)
{
try {
return(future.Get());
} catch (ThreadInterruptedException) {
interrupted = true;
}
}
} finally {
if (interrupted)
{
Thread.CurrentThread.Interrupt();
}
}
}
/// <summary>
/// Refreshes the value associated with <paramref name="key"/>, unless
/// another thread is already doing so.
/// </summary>
/// <param name="key">
/// The key associated with the value to refresh.
/// </param>
/// <param name="loader">
/// A <see cref="CacheLoader{T}"/> that is used to refresh the value.
/// </param>
/// <param name="value">
/// The newly refreshed value associated with <paramref name="key"/> if
/// the value was refreshed inline, or the default value of
/// <typeparamref name="T"/> if another thread is performing the refresh or
/// if a error occurs during refresh.
/// </param>
/// <returns>
/// <c>true</c> if the value was refreshed and <c>false</c> if another
/// thread is performing the refresh or if a error has been occured during
/// the refresh.
/// </returns>
bool Refresh(string key, CacheLoader <T> loader, out T value)
{
LoadingValueReference <T> loading_value_reference =
InsertLoadingValueReference(key);
value = default(T);
if (loading_value_reference == null)
{
return(false);
}
IFuture <T> result = LoadAsync(key, loading_value_reference, loader);
if (result.IsCompleted)
{
try {
value = result.Get();
} catch {
// don't let refresh exceptions propagate; error was already logged.
}
}
return(false);
}
public static Task <TResult?> AsTask <TResult>(this IFuture future, CancellationToken cancellationToken = default)
where TResult : Java.Lang.Object
{
cancellationToken.Register(() => future.Cancel(true));
return(Task.Run(() =>
{
try
{
var obj = future.Get();
if (future.IsCancelled || cancellationToken.IsCancellationRequested)
{
throw new OperationCanceledException();
}
return (TResult?)obj;
}
catch (CancellationException)
{
throw new OperationCanceledException();
}
}));
}