/// <summary> /// Load an optional object from the repository directory. /// Returns false iff no stream was found for the object, iff result is set to null. /// Throws if loading fails for any other reason. /// </summary> public static bool LoadModelOrNull <TRes, TSig>(IHostEnvironment env, out TRes result, RepositoryReader rep, string dir, params object[] extra) where TRes : class { Contracts.CheckValue(env, nameof(env)); env.CheckValue(rep, nameof(rep)); var ent = rep.OpenEntryOrNull(dir, ModelStreamName); if (ent != null) { using (ent) { // Provide the repository, entry, and directory name to the loadable class ctor. env.Assert(ent.Stream.Position == 0); LoadModel <TRes, TSig>(env, out result, rep, ent, dir, extra); return(true); } } if ((ent = rep.OpenEntryOrNull(dir, NameBinary)) != null) { using (ent) { env.Assert(ent.Stream.Position == 0); LoadModel <TRes, TSig>(env, out result, ent.Stream, extra); return(true); } } result = null; return(false); }
/// <summary> /// Try to load from the given repository entry using the default loader(s) specified in the header. /// Returns false iff the default loader(s) could not be bound to a compatible loadable class. /// </summary> private static bool TryLoadModel <TRes, TSig>(IHostEnvironment env, out TRes result, RepositoryReader rep, Repository.Entry ent, string dir, params object[] extra) where TRes : class { Contracts.CheckValue(env, nameof(env)); env.CheckValue(rep, nameof(rep)); long fp = ent.Stream.Position; using (var ctx = new ModelLoadContext(rep, ent, dir)) { env.Assert(fp == ctx.FpMin); if (ctx.TryLoadModelCore <TRes, TSig>(env, out result, extra)) { return(true); } } // TryLoadModelCore should rewind on failure. Contracts.Assert(fp == ent.Stream.Position); return(false); }
/// <summary> /// Load from the given repository entry using the default loader(s) specified in the header. /// </summary> public static void LoadModel <TRes, TSig>(IHostEnvironment env, out TRes result, RepositoryReader rep, Repository.Entry ent, string dir, params object[] extra) where TRes : class { Contracts.CheckValue(env, nameof(env)); env.CheckValue(rep, nameof(rep)); if (!TryLoadModel <TRes, TSig>(env, out result, rep, ent, dir, extra)) { throw env.ExceptDecode("Couldn't load model: '{0}'", dir); } }
/// <summary> /// Load an object from the repository directory. /// </summary> public static void LoadModel <TRes, TSig>(IHostEnvironment env, out TRes result, RepositoryReader rep, string dir, params object[] extra) where TRes : class { Contracts.CheckValue(env, nameof(env)); env.CheckValue(rep, nameof(rep)); if (!LoadModelOrNull <TRes, TSig>(env, out result, rep, dir, extra)) { throw env.ExceptDecode("Corrupt model file"); } env.AssertValue(result); }