public async Task WaitForChange()
{
const string newValue = "foo";
string key = _fixture.GenerateCustomKey();
await _fixture.UpdateMetadataAsync($"instance/attributes/{key}", "initial value");
var task = Task.Run(async() =>
{
await Task.Delay(TimeSpan.FromSeconds(2));
await _fixture.UpdateMetadataAsync($"instance/attributes/{key}", newValue);
});
// TODO: This pattern to get the original ETag seems messy. Maybe add something to get an ETag.
// Snippet: WaitForChange
MetadataClient client = MetadataClient.Create();
// Get the original ETag so we know when the metadata changes.
string lastETag = client.WaitForChange("instance/attributes", timeout: TimeSpan.FromMilliseconds(1)).ETag;
WaitForChangeResult result;
while (true)
{
// Wait in 30 second blocks until the value actually changes.
result = client.WaitForChange("instance/attributes", lastETag, TimeSpan.FromSeconds(30));
if (result.ETag != lastETag)
{
JObject currentCustomMetadata = JObject.Parse(result.Content);
foreach (JProperty customMetadata in currentCustomMetadata.Properties())
{
Console.WriteLine(customMetadata.Name + " = " + customMetadata.Value);
}
break;
}
}
// End snippet
dynamic obj = JsonConvert.DeserializeObject(result.Content);
Assert.Equal(newValue, obj[key].Value);
await task;
}
public async Task WaitForChange()
{
const string newValue = "foo";
string key = _fixture.GenerateCustomKey();
await _fixture.UpdateMetadataAsync($"instance/attributes/{key}", "initial value");
var task = Task.Run(async() =>
{
await Task.Delay(TimeSpan.FromSeconds(2));
await _fixture.UpdateMetadataAsync($"instance/attributes/{key}", newValue);
});
// Snippet: WaitForChange
MetadataClient client = MetadataClient.Create();
// Get the original metadata and its ETag so we know when the metadata changes.
MetadataResult initialResult = client.GetMetadata("instance/attributes");
Console.WriteLine("Initial Metadata:");
JObject initialMetadata = JObject.Parse(initialResult.Content);
foreach (JProperty property in initialMetadata.Properties())
{
Console.WriteLine(property.Name + " = " + property.Value);
}
string lastETag = initialResult.ETag;
MetadataResult changeResult;
while (true)
{
// Wait in 30 second blocks until the value actually changes.
changeResult = client.WaitForChange("instance/attributes", lastETag, TimeSpan.FromSeconds(30));
if (changeResult.ETag != lastETag)
{
Console.WriteLine("Changed Metadata:");
JObject currentMetadata = JObject.Parse(changeResult.Content);
foreach (JProperty property in currentMetadata.Properties())
{
Console.WriteLine(property.Name + " = " + property.Value);
}
break;
}
}
// End snippet
dynamic obj = JsonConvert.DeserializeObject(changeResult.Content);
Assert.Equal(newValue, obj[key].Value);
await task;
}