private void SaveCacheEntryFailSafe(DiscoveryCacheEntry entry)
{
Task.Run(() => {
try {
_PersistentCache.SaveEntry(entry);
}
catch {
}
});
}
public bool AnnounceServiceUrl(string serviceUrl, string contractFullName, int contractMajorVersion, string infrastructureScopeName, int initialLoadMetric, DateTime timestampUtc, string legitimationHash)
{
DiscoveryCacheEntry entry = this.PickCacheEntry(contractFullName, contractMajorVersion, infrastructureScopeName, true);
//invalidate the cache to force a reload (because we dont know the sort-order)
entry.LastUpdateUtc = DateTime.MinValue;
//just for the case that the reload fails -> append as last entry (but only if available when load >=0)
if (initialLoadMetric >= 0 && !entry.UrlEntries.Contains(serviceUrl))
{
entry.UrlEntries = entry.UrlEntries.Union(new string[] { serviceUrl }).ToArray();
}
this.SaveCacheEntryFailSafe(entry);
return(_PrimaryRegistry.AnnounceServiceUrl(serviceUrl, contractFullName, contractMajorVersion, infrastructureScopeName, initialLoadMetric, timestampUtc, legitimationHash));
}
public string[] GetServiceUrls(string contractFullName, int contractMajorVersion, string infrastructureScopeName)
{
DiscoveryCacheEntry entry = this.PickCacheEntry(contractFullName, contractMajorVersion, infrastructureScopeName, true);
if (entry.LastUpdateUtc.AddMinutes(_CacheRefreshIntervalMinutes) < DateTime.UtcNow)
{
try {
entry.UrlEntries = _PrimaryRegistry.GetServiceUrls(contractFullName, contractMajorVersion, infrastructureScopeName);
}
catch {
//cache should be used as long as registry is not available
}
//this will always be set to avoid retries
entry.LastUpdateUtc = DateTime.UtcNow;
this.SaveCacheEntryFailSafe(entry);
}
return(entry.UrlEntries);
}
private DiscoveryCacheEntry PickCacheEntry(string contractFullName, int contractMajorVersion, string infrastructureScopeName, bool createIfNotEists)
{
DiscoveryCacheEntry entry;
lock (_CacheEntries) {
entry = _CacheEntries.Where((e) => e.ContractFullName == contractFullName && e.ContractMajorVersion == contractMajorVersion && e.InfrastructureScopeName == infrastructureScopeName).SingleOrDefault();
if (entry is null && createIfNotEists)
{
entry = new DiscoveryCacheEntry();
entry.ContractFullName = contractFullName;
entry.ContractMajorVersion = contractMajorVersion;
entry.InfrastructureScopeName = infrastructureScopeName;
entry.LastUpdateUtc = DateTime.MinValue;
entry.UrlEntries = new string[] { };
_CacheEntries.Add(entry);
}
}
return(entry);
}
