mirror of
https://github.com/zaphar/ucg.git
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85 lines
2.6 KiB
Rust
85 lines
2.6 KiB
Rust
// Copyright 2017 Jeremy Wall <jeremy@marzhillstudios.com>
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! The asset cache for the ucg compiler.
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use std::collections::HashMap;
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use std::io;
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use std::path::PathBuf;
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use std::rc::Rc;
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use std::result;
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use super::Val;
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pub type Result<T> = result::Result<T, io::Error>;
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/// Defines the cach interface for a UCG build. It has functions to retrieve
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/// An asset for a referenced ucg file if it exists as well as to stash
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/// an asset for a built ucg file.
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///
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/// All methods with a path do path canonicalization. As a result the path
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/// is expected to exist on the filesystem. If the path does not exist on
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/// the local filesystem then the Cache may return an error.
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pub trait Cache {
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fn has_path(&self, path: &PathBuf) -> Result<bool>;
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fn get(&self, path: &PathBuf) -> Result<Option<Rc<Val>>>;
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fn stash(&mut self, path: PathBuf, asset: Rc<Val>, modkey: u64) -> Result<()>;
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fn evict(&mut self, path: &PathBuf) -> Result<()>;
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fn check_mod_key(&self, path: &PathBuf, modkey: u64) -> Result<bool>;
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}
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pub struct MemoryCache {
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map: HashMap<PathBuf, Rc<Val>>,
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mod_key_map: HashMap<PathBuf, u64>,
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}
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impl MemoryCache {
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pub fn new() -> Self {
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MemoryCache {
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map: HashMap::new(),
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mod_key_map: HashMap::new(),
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}
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}
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}
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impl Cache for MemoryCache {
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fn has_path(&self, path: &PathBuf) -> Result<bool> {
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Ok(self.map.contains_key(path))
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}
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fn get(&self, path: &PathBuf) -> Result<Option<Rc<Val>>> {
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Ok(self.map.get(path).map(|v| v.clone()))
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}
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fn stash(&mut self, path: PathBuf, asset: Rc<Val>, modkey: u64) -> Result<()> {
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self.map.insert(path.clone(), asset);
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self.mod_key_map.insert(path, modkey);
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Ok(())
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}
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fn evict(&mut self, path: &PathBuf) -> Result<()> {
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self.map.remove(path);
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self.mod_key_map.remove(path);
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Ok(())
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}
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fn check_mod_key(&self, path: &PathBuf, modkey: u64) -> Result<bool> {
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Ok(self
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.mod_key_map
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.get(path)
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.map(|v| *v == modkey)
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.unwrap_or(true))
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}
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}
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