/// <summary>
/// 尝试获取指定表达式的缓存。
/// </summary>
/// <param name="expression"></param>
/// <param name="func">当缓存不存在时，创建缓存数据的函数。</param>
/// <returns></returns>
internal static Delegate TryGetDelegate(Expression expression, Func <LambdaExpression> func)
{
if (!CachaebleChecker.Check(expression))
{
return(func().Compile());
}
var section = ConfigurationUnity.GetSection <TranslatorConfigurationSection>();
var option = section == null ? TranslateOptions.Default : section.Options;
if (!option.ParseCacheEnabled)
{
return(func().Compile());
}
var lazy = new Lazy <Delegate>(() =>
{
//将表达式内的 Segment 替换成参数
var segParExp = Expression.Parameter(typeof(IDataSegment), "g");
var lambdaExp = func() as LambdaExpression;
var newExp = SegmentReplacer.Repalce(lambdaExp.Body, segParExp);
lambdaExp = Expression.Lambda(newExp, lambdaExp.Parameters[0], segParExp);
return(lambdaExp.Compile());
});
var cacheKey = ExpressionKeyGenerator.GetKey(expression, "Trans");
return(MemoryCacheManager.Instance.TryGet(cacheKey, () => lazy.Value, () => new RelativeTime(TimeSpan.FromSeconds(option.ParseCacheExpired))));
}
/// <summary>
/// 尝试获取指定表达式的缓存。
/// </summary>
/// <param name="expression"></param>
/// <param name="func">当缓存不存在时，创建缓存数据的函数。</param>
/// <returns></returns>
internal static Delegate TryGetDelegate(Expression expression, Func <LambdaExpression> func)
{
var section = ConfigurationUnity.GetSection <TranslatorConfigurationSection>();
var option = section == null ? TranslateOptions.Default : section.Options;
var result = CacheableChecker.Check(expression);
if (!result.Required || (result.Enabled == null && !option.CacheParsing) || result.Enabled == false)
{
return(func().Compile());
}
var cacheKey = ExpressionKeyGenerator.GetKey(expression, "Trans");
cacheKey = NativeCacheKeyContext.GetKey(cacheKey);
return(MemoryCacheManager.Instance.TryGet(cacheKey, () =>
{
var lambdaExp = func() as LambdaExpression;
var segment = SegmentFinder.Find(expression);
if (segment != null)
{
//将表达式内的 Segment 替换成参数
var segParExp = Expression.Parameter(typeof(IDataSegment), "g");
var newExp = SegmentReplacer.Repalce(lambdaExp.Body, segParExp);
var parameters = new List <ParameterExpression>(lambdaExp.Parameters);
parameters.Insert(1, segParExp);
lambdaExp = Expression.Lambda(newExp, parameters.ToArray());
}
return lambdaExp.Compile();
},
() => new RelativeTime(result.Expired ?? TimeSpan.FromSeconds(option.CacheParsingTimes))));
}
/// <summary>
/// 尝试通过表达式获取执行后的结果缓存。
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="expression"></param>
/// <param name="func"></param>
/// <returns></returns>
internal static T TryGet <T>(Expression expression, Func <T> func)
{
var section = ConfigurationUnity.GetSection <TranslatorConfigurationSection>();
var option = section == null ? TranslateOptions.Default : section.Options;
var result = CacheableChecker.Check(expression);
//没有开启数据缓存
if ((result.Enabled == null && !option.CacheExecution) || result.Enabled == false)
{
return(func());
}
var cacheMgr = CacheManagerFactory.CreateManager();
if (cacheMgr == null)
{
return(func());
}
var cacheKey = ExpressionKeyGenerator.GetKey(expression, "Exec");
cacheKey = NativeCacheKeyContext.GetKey(cacheKey);
Reference(cacheKey, expression);
var segment = SegmentFinder.Find(expression);
var pager = segment as DataPager;
var cacheFunc = new Func <CacheItem <T> >(() =>
{
var data = EnumerateData(func());
var isEnumerable = typeof(T).IsGenericType && typeof(T).GetGenericTypeDefinition() == typeof(IEnumerable <>);
if (isEnumerable)
{
var elementType = typeof(T).GetEnumerableElementType();
var method = typeof(Enumerable).GetMethod(nameof(Enumerable.ToList)).MakeGenericMethod(elementType);
data = (T)method.Invoke(null, new object[] { data });
}
var total = 0;
if (pager != null)
{
total = pager.RecordCount;
}
return(new CacheItem <T> {
Data = data, Total = total
});
});
var cacheItem = cacheMgr.TryGet(cacheKey, cacheFunc, () => new RelativeTime(result.Expired ?? TimeSpan.FromSeconds(option.CacheExecutionTimes)));
if (pager != null)
{
pager.RecordCount = cacheItem.Total;
}
return(cacheItem.Data);
}
/// <summary>
/// 尝试通过表达式获取执行后的结果缓存。
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="expression"></param>
/// <param name="func"></param>
/// <returns></returns>
internal static T TryGet <T>(Expression expression, Func <T> func)
{
var section = ConfigurationUnity.GetSection <TranslatorConfigurationSection>();
var option = section == null ? TranslateOptions.Default : section.Options;
//没有开启数据缓存
if (!option.DataCacheEnabled)
{
return(func());
}
var cacheMgr = CacheManagerFactory.CreateManager();
if (cacheMgr == null)
{
return(func());
}
var cacheKey = ExpressionKeyGenerator.GetKey(expression, "Exec");
Reference(cacheKey, expression);
var segment = SegmentFinder.Find(expression);
var pager = segment as DataPager;
var cacheFunc = new Func <CacheItem <T> >(() =>
{
var data = func();
var total = 0;
if (pager != null)
{
total = pager.RecordCount;
}
return(new CacheItem <T> {
Data = data, Total = total
});
});
var cacheItem = cacheMgr.TryGet(cacheKey, cacheFunc, () => new RelativeTime(TimeSpan.FromSeconds(option.DataCacheExpired)));
if (pager != null)
{
pager.RecordCount = cacheItem.Total;
}
return(cacheItem.Data);
}