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In BrowserUriHelper, change URI caching logic to be more defensive in case OnLocationChanged isn't being used

This commit is contained in:
Steve Sanderson 2018-02-23 11:05:29 +00:00
parent f684203721
commit 8e57261167
1 changed files with 19 additions and 6 deletions
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25
src/Microsoft.AspNetCore.Blazor.Browser/Services/BrowserUriHelper.cs
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@ -20,7 +20,7 @@ namespace Microsoft.AspNetCore.Blazor.Browser.Services
// safety concerns due to the static state.
static readonly string _functionPrefix = typeof(BrowserUriHelper).FullName;
static bool _hasEnabledNavigationInterception;
static string _currentAbsoluteUri;
static string _cachedAbsoluteUri;
static EventHandler<string> _onLocationChanged;
static string _baseUriString;
static Uri _baseUri;
@ -37,6 +37,8 @@ namespace Microsoft.AspNetCore.Blazor.Browser.Services
{
// We could consider deactivating the JS-side enableNavigationInteception
// if there are no remaining listeners, but we don't need that currently.
// If we ever do that, will also need to change the logic inside GetAbsoluteUri
// so it knows not to continue using the cached URI.
_onLocationChanged -= value;
}
}
@ -51,13 +53,24 @@ namespace Microsoft.AspNetCore.Blazor.Browser.Services
/// <inheritdoc />
public string GetAbsoluteUri()
{
if (_currentAbsoluteUri == null)
if (_cachedAbsoluteUri == null)
{
_currentAbsoluteUri = RegisteredFunction.InvokeUnmarshalled<string>(
var newUri = RegisteredFunction.InvokeUnmarshalled<string>(
$"{_functionPrefix}.getLocationHref");
}
return _currentAbsoluteUri;
if (_hasEnabledNavigationInterception)
{
// Once we turn on navigation interception, we no longer have to query
// the browser for its URI each time (because we'd know if it had changed)
_cachedAbsoluteUri = newUri;
}
return newUri;
}
else
{
return _cachedAbsoluteUri;
}
}
/// <inheritdoc />
@ -105,7 +118,7 @@ namespace Microsoft.AspNetCore.Blazor.Browser.Services
private static void NotifyLocationChanged(string newAbsoluteUri)
{
_currentAbsoluteUri = newAbsoluteUri;
_cachedAbsoluteUri = newAbsoluteUri;
_onLocationChanged?.Invoke(null, newAbsoluteUri);
}