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// This file is part of dpdk. It is subject to the license terms in the COPYRIGHT file found in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/dpdk/master/COPYRIGHT. No part of dpdk, including this file, may be copied, modified, propagated, or distributed except according to the terms contained in the COPYRIGHT file.
// Copyright © 2016-2017 The developers of dpdk. See the COPYRIGHT file in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/dpdk/master/COPYRIGHT.


/// Represents a set of resource limits.
#[derive(Debug)]
#[derive(Serialize, Deserialize)]
pub struct ResourceLimitsSet(HashMap<ResourceName, SoftAndHardResourceLimit>);

impl ResourceLimitsSet
{
	/// A generous default for resource limits suitable for a modern server.
	///
	/// Obtain `maximum_number_of_open_file_descriptors` from `ResourceLimit::maximum_number_of_open_file_descriptors()`.
	#[inline(always)]
	pub fn defaultish(maximum_number_of_open_file_descriptors: ResourceLimit) -> Self
	{
		// Ideally, these should be constants, but Rust's const fn is too limited and does not allow assert! or if.
		let _64_000: SoftAndHardResourceLimit = SoftAndHardResourceLimit::both(ResourceLimit::Finite(64_000));
		let _262_144: SoftAndHardResourceLimit = SoftAndHardResourceLimit::both(ResourceLimit::Finite(262_144));
		
		let mut map = HashMap::with_capacity(16);
		
		use self::ResourceName::*;
		
		map.insert(MaximumSizeOfFilesThatProcessCanCreateInBytes, SoftAndHardResourceLimit::BothInfinite);
		map.insert(MaximumSizeOfVirtualMemoryAddressSpaceInBytes, SoftAndHardResourceLimit::BothInfinite);
		map.insert(CpuTimeLimitInSeconds, SoftAndHardResourceLimit::BothInfinite);
		map.insert(MaximumNumberOfFileDescriptors, SoftAndHardResourceLimit::both(maximum_number_of_open_file_descriptors));
		map.insert(MaximumSizeOfProcessResidentSetSizeInBytes, SoftAndHardResourceLimit::BothInfinite); // Ignored on Linux kernels after 2.4.30.
		map.insert(MaximumNumberOfProcessAndThreads, _64_000);
		map.insert(MaximumSizeOfACoreDumpFileInBytes, SoftAndHardResourceLimit::BothZero);
		
		map.insert(MaximumNumberOfBytesForPosixMessageQueues, SoftAndHardResourceLimit::BothZero);
		map.insert(MaximumNumberOfBytesThatProcessCanMemLock, SoftAndHardResourceLimit::BothInfinite);
		map.insert(MaximumSizeOfProcessStackInBytes, _262_144); // 256Kb stacks!
		
		ResourceLimitsSet(map)
	}
	
	/// Applies the resource limits.
	#[inline(always)]
	pub fn change(&self)
	{
		for (resource_name, soft_and_hard_resource_limit) in &self.0
		{
			resource_name.set(soft_and_hard_resource_limit);
		}
	}
}