private static CompiledExpression getCompiledExpression(string expression)
{
lock (_cacheLock)
{
bool success = _cache.TryGetValue(expression, out CompiledExpression ce);
if (!success)
{
var compiler = new FhirPathCompiler();
ce = compiler.Compile(expression);
if (_cache.Count >= MAX_FP_EXPRESSION_CACHE_SIZE)
{
var lruExpression = _mruList.First();
_cache.Remove(lruExpression);
_mruList.Remove(lruExpression);
}
_cache.Add(expression, ce);
}
_mruList.Remove(expression);
_mruList.Add(expression);
return(ce);
}
}
private static CompiledExpression Compile(string expression)
{
var compiler = new FhirPathCompiler();
return(compiler.Compile(expression));
}
