| @@ -65,7 +65,7 @@ mod find { · 64 unmodified lines |
| 65 | 65 | } |
| 66 | 66 | } |
| 67 | 67 | |
| 68 | | −mod store { |
| 68 | +mod init { |
| 69 | 69 | use git_features::threading::OwnShared; |
| 70 | 70 | use std::path::PathBuf; |
| 71 | 71 | use std::sync::atomic::AtomicUsize; |
| @@ -92,3 +92,87 @@ mod store { · 20 unmodified lines |
| 92 | 92 | } |
| 93 | 93 | } |
| 94 | 94 | } |
| 95 | + |
| 96 | +mod store { |
| 97 | + /// An id to refer to an index file or a multipack index file |
| 98 | + pub type IndexId = usize; |
| 99 | + |
| 100 | + /// A way to load and refer to a pack uniquely, namespaced by their indexing mechanism, aka multi-pack or not. |
| 101 | + pub struct PackId { |
| 102 | + /// Note that if `multipack_index = None`, this index is corresponding to the index id. |
| 103 | + /// So a pack is always identified by its corresponding index. |
| 104 | + /// If it is a multipack index, this is the id / offset of the pack in the `multipack_index`. |
| 105 | + pub(crate) index: IndexId, |
| 106 | + pub(crate) multipack_index: Option<IndexId>, |
| 107 | + } |
| 108 | +} |
| 109 | + |
| 110 | +mod handle { |
| 111 | + use crate::general::store; |
| 112 | + use std::sync::Arc; |
| 113 | + |
| 114 | + mod multi_index { |
| 115 | + // TODO: replace this one with an actual implementation of a multi-pack index. |
| 116 | + pub type File = (); |
| 117 | + } |
| 118 | + |
| 119 | + pub enum SingleOrMultiIndex { |
| 120 | + Single { |
| 121 | + index: Arc<git_pack::index::File>, |
| 122 | + data: Option<Arc<git_pack::data::File>>, |
| 123 | + }, |
| 124 | + Multi { |
| 125 | + index: Arc<multi_index::File>, |
| 126 | + data: Vec<Option<Arc<git_pack::data::File>>>, |
| 127 | + }, |
| 128 | + } |
| 129 | + |
| 130 | + pub struct IndexLookup { |
| 131 | + file: SingleOrMultiIndex, |
| 132 | + id: store::IndexId, |
| 133 | + } |
| 134 | + |
| 135 | + pub struct IndexForObjectInPack { |
| 136 | + /// The internal identifier of the pack itself, which either is referred to by an index or a multi-pack index. |
| 137 | + pack_id: store::PackId, |
| 138 | + /// The index of the object within the pack |
| 139 | + object_index_in_pack: u32, |
| 140 | + } |
| 141 | + |
| 142 | + mod index_lookup { |
| 143 | + use crate::general::{handle, store}; |
| 144 | + use git_hash::oid; |
| 145 | + use std::sync::Arc; |
| 146 | + |
| 147 | + impl handle::IndexLookup { |
| 148 | + /// See if the oid is contained in this index, and return its full id for lookup possibly alongside its data file if already |
| 149 | + /// loaded. |
| 150 | + /// If it is not loaded, ask it to be loaded and put it into the returned mutable option for safe-keeping. |
| 151 | + fn lookup( |
| 152 | + &mut self, |
| 153 | + object_id: &oid, |
| 154 | + ) -> Option<(handle::IndexForObjectInPack, &mut Option<Arc<git_pack::data::File>>)> { |
| 155 | + let id = self.id; |
| 156 | + match &mut self.file { |
| 157 | + handle::SingleOrMultiIndex::Single { index, data } => { |
| 158 | + index.lookup(object_id).map(|object_index_in_pack| { |
| 159 | + ( |
| 160 | + handle::IndexForObjectInPack { |
| 161 | + pack_id: store::PackId { |
| 162 | + index: id, |
| 163 | + multipack_index: None, |
| 164 | + }, |
| 165 | + object_index_in_pack, |
| 166 | + }, |
| 167 | + data, |
| 168 | + ) |
| 169 | + }) |
| 170 | + } |
| 171 | + handle::SingleOrMultiIndex::Multi { index, data } => { |
| 172 | + todo!("find respective pack and return it as &mut Option<>") |
| 173 | + } |
| 174 | + } |
| 175 | + } |
| 176 | + } |
| 177 | + } |
| 178 | +} |