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use std::collections::HashMap;
use std::io::Read;
use std::sync::{Arc, RwLock};
use crate::backend;
use crate::backend::{
Backend, BackendResult, CommitId, Conflict, ConflictId, FileId, SymlinkId, TreeId,
};
use crate::commit::Commit;
use crate::repo_path::RepoPath;
use crate::tree::Tree;
use crate::tree_builder::TreeBuilder;
#[derive(Debug)]
pub struct Store {
backend: Box<dyn Backend>,
commit_cache: RwLock<HashMap<CommitId, Arc<backend::Commit>>>,
tree_cache: RwLock<HashMap<(RepoPath, TreeId), Arc<backend::Tree>>>,
}
impl Store {
pub fn new(backend: Box<dyn Backend>) -> Arc<Self> {
Arc::new(Store {
backend,
commit_cache: Default::default(),
tree_cache: Default::default(),
})
}
pub fn hash_length(&self) -> usize {
self.backend.hash_length()
}
pub fn git_repo(&self) -> Option<git2::Repository> {
self.backend.git_repo()
}
pub fn empty_tree_id(&self) -> &TreeId {
self.backend.empty_tree_id()
}
pub fn root_commit_id(&self) -> &CommitId {
self.backend.root_commit_id()
}
pub fn root_commit(self: &Arc<Self>) -> Commit {
self.get_commit(self.backend.root_commit_id()).unwrap()
}
pub fn get_commit(self: &Arc<Self>, id: &CommitId) -> BackendResult<Commit> {
let data = self.get_backend_commit(id)?;
Ok(Commit::new(self.clone(), id.clone(), data))
}
fn get_backend_commit(&self, id: &CommitId) -> BackendResult<Arc<backend::Commit>> {
{
let read_locked_cached = self.commit_cache.read().unwrap();
if let Some(data) = read_locked_cached.get(id).cloned() {
return Ok(data);
}
}
let commit = self.backend.read_commit(id)?;
let data = Arc::new(commit);
let mut write_locked_cache = self.commit_cache.write().unwrap();
write_locked_cache.insert(id.clone(), data.clone());
Ok(data)
}
pub fn write_commit(self: &Arc<Self>, commit: backend::Commit) -> Commit {
assert!(!commit.parents.is_empty());
let commit_id = self.backend.write_commit(&commit).unwrap();
let data = Arc::new(commit);
{
let mut write_locked_cache = self.commit_cache.write().unwrap();
write_locked_cache.insert(commit_id.clone(), data.clone());
}
Commit::new(self.clone(), commit_id, data)
}
pub fn get_tree(self: &Arc<Self>, dir: &RepoPath, id: &TreeId) -> BackendResult<Tree> {
let data = self.get_backend_tree(dir, id)?;
Ok(Tree::new(self.clone(), dir.clone(), id.clone(), data))
}
fn get_backend_tree(&self, dir: &RepoPath, id: &TreeId) -> BackendResult<Arc<backend::Tree>> {
let key = (dir.clone(), id.clone());
{
let read_locked_cache = self.tree_cache.read().unwrap();
if let Some(data) = read_locked_cache.get(&key).cloned() {
return Ok(data);
}
}
let data = Arc::new(self.backend.read_tree(dir, id)?);
let mut write_locked_cache = self.tree_cache.write().unwrap();
write_locked_cache.insert(key, data.clone());
Ok(data)
}
pub fn write_tree(&self, path: &RepoPath, contents: &backend::Tree) -> BackendResult<TreeId> {
self.backend.write_tree(path, contents)
}
pub fn read_file(&self, path: &RepoPath, id: &FileId) -> BackendResult<Box<dyn Read>> {
self.backend.read_file(path, id)
}
pub fn write_file(&self, path: &RepoPath, contents: &mut dyn Read) -> BackendResult<FileId> {
self.backend.write_file(path, contents)
}
pub fn read_symlink(&self, path: &RepoPath, id: &SymlinkId) -> BackendResult<String> {
self.backend.read_symlink(path, id)
}
pub fn write_symlink(&self, path: &RepoPath, contents: &str) -> BackendResult<SymlinkId> {
self.backend.write_symlink(path, contents)
}
pub fn read_conflict(&self, path: &RepoPath, id: &ConflictId) -> BackendResult<Conflict> {
self.backend.read_conflict(path, id)
}
pub fn write_conflict(
&self,
path: &RepoPath,
contents: &Conflict,
) -> BackendResult<ConflictId> {
self.backend.write_conflict(path, contents)
}
pub fn tree_builder(self: &Arc<Self>, base_tree_id: TreeId) -> TreeBuilder {
TreeBuilder::new(self.clone(), base_tree_id)
}
}