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{ ISerializationStrategy, IdentitySerializationStrategy, JsonSerializationStrategy } from 'serialization';\r\n\r\nfunction isPromiseLike<T>( foo: any ): foo is PromiseLike<T> {\r\n\treturn foo && typeof foo.then === 'function';\r\n}\r\n\r\nfunction isStorage( foo: any ): foo is Storage {\r\n\tconst proto = Object.getPrototypeOf( foo );\r\n\treturn typeof proto.setItem !== 'undefined';\r\n}\r\n\r\nexport type CacheStore<T> = IDictionary<T>|Storage;\r\n\r\nexport interface ICacheSet<CacheKey,T> {\r\n\tset( key: CacheKey, value: T );\r\n\tunset( key: CacheKey );\r\n\tclear();\r\n}\r\n\r\nexport interface ICacheGet<CacheKey,T> {\r\n\tget( key: CacheKey ): T;\r\n\tcontainsKey( key: CacheKey ): boolean;\r\n\tkeys?: Array<CacheKey>;\r\n}\r\n\r\nexport interface ICache<CacheKey,T> extends ICacheGet<CacheKey,T>, ICacheSet<CacheKey,T> {}\r\nexport interface ICacheSetAsync<CacheKey,T> extends ICacheSet<CacheKey,T|PromiseLike<T>> {}\r\nexport interface ICacheGetAsync<CacheKey,T> extends ICacheGet<CacheKey,Promise<T>> {}\r\nexport interface ICacheAsync<CacheKey,T> extends ICacheGetAsync<CacheKey,T>, ICacheSetAsync<CacheKey,T> {}\r\nexport interface IBatchedCacheAsync<CacheKey,T> extends ICacheAsync<CacheKey,T> {\r\n\tgetBatch( keys: ArrayLike<CacheKey> ): Array<Promise<T>>;\r\n\tdefer(): void;\r\n\tfetch(): void;\r\n}\r\n\r\n// TODO: move someplace more accessible\r\nclass DeferredPromise<T> {\r\n\tconstructor() {\r\n\t\tthis.promise = new Promise( ( resolve, reject ) => {\r\n\t\t\tthis.resolve = resolve;\r\n\t\t\tthis.reject = reject;\r\n\t\t} );\r\n\t}\r\n\r\n\tpublic promise: Promise<T>;\r\n\tpublic resolve: ( value?: T|PromiseLike<T> ) => void;\r\n\tpublic reject: ( err?: T ) => void;\r\n\r\n\tpublic static wrap<T>( promiselike: T|PromiseLike<T> ) {\r\n\t\tconst retval = new DeferredPromise<T>();\r\n\t\tPromise.resolve( promiselike ).then( value => { retval.resolve( <T>value ); }, err => { retval.reject( err ); } );\r\n\t\treturn retval;\r\n\t}\r\n}\r\n\r\nexport class LookupCache<CacheKey,T> implements ICache<CacheKey,T> {\r\n\tconstructor( fn: ( param: CacheKey ) => T, backingCache: ICache<CacheKey,T> = new SimpleCache<CacheKey,T>() ) {\r\n\t\tthis.fn = fn;\r\n\t\tthis.backingCache = backingCache;\r\n\t}\r\n\r\n\tpublic get( key: CacheKey ): T {\r\n\t\tif( !this.backingCache.containsKey( key ) ) {\r\n\t\t\tthis.backingCache.set( key, this.fn( key ) );\r\n\t\t}\r\n\t\treturn this.backingCache.get( key );\r\n\t}\r\n\r\n\tpublic get keys() {\r\n\t\treturn this.backingCache.keys;\r\n\t}\r\n\r\n\tpublic containsKey( key: CacheKey ) {\r\n\t\treturn this.backingCache.containsKey( key );\r\n\t}\r\n\r\n\tpublic clear() {\r\n\t\tthis.backingCache.clear();\r\n\t}\r\n\r\n\tpublic set( key: CacheKey, value: T ) {\r\n\t\tthis.backingCache.set( key, value );\r\n\t}\r\n\r\n\tpublic unset( key: CacheKey ) {\r\n\t\tthis.backingCache.unset( key );\r\n\t}\r\n\r\n\tprivate fn: ( param: CacheKey ) => T;\r\n\tprotected backingCache: ICache<CacheKey,T>;\r\n}\r\n\r\nexport abstract class LookupCacheAsyncImpl<CacheKey,T> implements ICacheAsync<CacheKey,T> {\r\n\tconstructor( backingCache: ICache<CacheKey,T> = new SimpleCache<CacheKey,T>() ) {\r\n\t\tthis.backingCache = backingCache;\r\n\t}\r\n\r\n\tpublic get( key: CacheKey ): Promise<T> {\r\n\t\tif( this.backingCache.containsKey( key ) ) {\r\n\t\t\treturn Promise.resolve( this.backingCache.get( key ) );\r\n\t\t}\r\n\t\tconst getMissingValue = () => Promise.resolve( this.getMissingValue( key ) );\r\n\t\tlet pending = this.pendingCache.get( key ),\r\n\t\t\tpromiselike: PromiseLike<T>;\r\n\t\tif( pending ) {\r\n\t\t\tpromiselike = Promise.resolve( pending.promise.then( undefined, getMissingValue ) );\r\n\t\t} else {\r\n\t\t\tpromiselike = getMissingValue();\r\n\t\t}\r\n\t\tpromiselike = Promise.resolve( promiselike.then( value => this.realizeValue( key, value ) ) );\r\n\t\treturn this.pendingValue( key, promiselike );\r\n\t}\r\n\r\n\tpublic containsKey( key: CacheKey ) {\r\n\t\treturn this.backingCache.containsKey( key ) || this.pendingCache.containsKey( key );\r\n\t}\r\n\r\n\tpublic get keys() {\r\n\t\tconst backingKeys = this.backingCache.keys,\r\n\t\t\tpendingKeys = this.pendingCache.keys;\r\n\t\tif( !backingKeys && !pendingKeys ) return undefined;\r\n\t\treturn (<CacheKey[]>[]).concat( backingKeys || [] ).concat( pendingKeys || [] );\r\n\t}\r\n\r\n\tpublic clear() {\r\n\t\tconst pendingKeys = this.pendingCache.keys;\r\n\t\tif( pendingKeys ) for( let pendingKey of pendingKeys ) {\r\n\t\t\tthis.unset( pendingKey );\r\n\t\t}\r\n\t\tthis.pendingCache.clear();\r\n\t\tthis.backingCache.clear();\r\n\t}\r\n\r\n\tprotected abstract getMissingValue( key: CacheKey ): PromiseLike<T>;\r\n\r\n\tprotected pendingValue( key: CacheKey, value: PromiseLike<T> ) {\r\n\t\tthis.backingCache.unset( key );\r\n\t\tconst deferredPromise = DeferredPromise.wrap( value );\r\n\t\t\r\n\t\tconst pending = this.pendingCache.get( key );\r\n\t\tif( pending ) {\r\n\t\t\tpending.resolve( deferredPromise.promise );\r\n\t\t} else {\r\n\t\t\tdeferredPromise.promise.then( value => this.realizeValue( key, value ) );\r\n\t\t}\r\n\t\tthis.pendingCache.set( key, deferredPromise );\r\n\r\n\t\treturn deferredPromise.promise;\r\n\t}\r\n\r\n\tprotected realizeValue( key: CacheKey, value: T ) {\r\n\t\tconst deferredPromise = this.pendingCache.get( key );\r\n\t\tif( deferredPromise ) {\r\n\t\t\tdeferredPromise.resolve( value );\r\n\t\t\tthis.pendingCache.unset( key );\r\n\t\t}\r\n\t\tthis.backingCache.set( key, value );\r\n\t\treturn value;\r\n\t}\r\n\r\n\tpublic set( key: CacheKey, value: T|PromiseLike<T> ) {\r\n\t\tif( isPromiseLike<T>( value ) ) {\r\n\t\t\tthis.pendingValue( key, value );\r\n\t\t} else {\r\n\t\t\tthis.realizeValue( key, value );\r\n\t\t}\r\n\t}\r\n\r\n\tpublic unset( key: CacheKey ) {\r\n\t\tconst pending = this.pendingCache.get( key );\r\n\t\tif( pending ) pending.reject();\r\n\t\tthis.pendingCache.unset( key );\r\n\t\tthis.backingCache.unset( key );\r\n\t}\r\n\r\n\tprivate backingCache: ICache<CacheKey,T>;\r\n\tprivate pendingCache = new SimpleCache<CacheKey,DeferredPromise<T>>();\r\n}\r\n\r\nexport class LookupCacheAsync<CacheKey,T> extends LookupCacheAsyncImpl<CacheKey,T> implements ICacheAsync<CacheKey,T> {\r\n\tconstructor( fn: ( param: CacheKey ) => T|PromiseLike<T>, backingCache?: ICache<CacheKey,T> ) {\r\n\t\tsuper( backingCache );\r\n\t\tthis.fn = fn;\r\n\t}\r\n\r\n\tprotected getMissingValue( key: CacheKey ) {\r\n\t\treturn Promise.resolve( this.fn( key ) );\r\n\t}\r\n\r\n\tprivate fn: ( param: CacheKey ) => T|PromiseLike<T>;\r\n}\r\n\r\nexport class BatchedLookupCacheAsync<CacheKey,T> extends LookupCacheAsyncImpl<CacheKey,T> implements IBatchedCacheAsync<CacheKey,T> {\r\n\tconstructor( private batch: ( param: Array<CacheKey> ) => ArrayLike<T|PromiseLike<T>>|PromiseLike<ArrayLike<T>> = ( param ) => Array.from( param, () => Promise.reject<T>( null ) ), backingCache?: ICache<CacheKey,T> ) {\r\n\t\tsuper( backingCache );\r\n\t}\r\n\r\n\tprotected getMissingValue( key: CacheKey ) {\r\n\t\tlet deferredPromise = this.deferreds.get( key );\r\n\t\tif( !deferredPromise ) {\r\n\t\t\tdeferredPromise = new DeferredPromise<T>();\r\n\t\t\tthis.deferreds.set( key, deferredPromise );\r\n\t\t}\r\n\t\tif( this.deferCount <= 0 ) {\r\n\t\t\tthis.resolve();\r\n\t\t}\r\n\t\treturn deferredPromise.promise;\r\n\t}\r\n\r\n\tprivate deferCount = 0;\r\n\tpublic defer() {\r\n\t\t++this.deferCount;\r\n\t}\r\n\r\n\tpublic getBatch( keys: ArrayLike<CacheKey> ): Array<Promise<T>> {\r\n\t\tthis.defer();\r\n\t\tconst retval = Array.from( keys, key => this.get( key ) );\r\n\t\tthis.fetch();\r\n\t\treturn retval;\r\n\t}\r\n\r\n\tpublic fetch() {\r\n\t\tif( this.deferCount > 0 ) {\r\n\t\t\tif( --this.deferCount > 0 ) return;\r\n\t\t}\r\n\t\tthis.deferCount = 0;\r\n\t\tthis.resolve();\r\n\t}\r\n\r\n\tpublic set( key: CacheKey, value: T|PromiseLike<T> ) {\r\n\t\tconst { deferreds } = this,\r\n\t\t\tdeferredPromise = deferreds.get( key );\r\n\t\tif( deferredPromise ) {\r\n\t\t\tdeferredPromise.resolve( value );\r\n\t\t\tdeferreds.unset( key );\r\n\t\t}\r\n\t\tsuper.set( key, value );\r\n\t}\r\n\r\n\tpublic unset( key: CacheKey ) {\r\n\t\tconst { deferreds } = this,\r\n\t\t\tdeferredPromise = deferreds.get( key );\r\n\t\tif( deferredPromise ) {\r\n\t\t\tdeferredPromise.reject();\r\n\t\t\tdeferreds.unset( key );\r\n\t\t}\r\n\t\tsuper.unset( key );\r\n\t}\r\n\r\n\tpublic clear() {\r\n\t\tconst { deferreds } = this,\r\n\t\t\t{ keys } = deferreds;\r\n\t\tfor( let key of keys ) {\r\n\t\t\tdeferreds.get( key ).reject();\r\n\t\t\tdeferreds.unset( key );\r\n\t\t}\r\n\t\tsuper.clear();\r\n\t}\r\n\r\n\tprivate resolve() {\r\n\t\tsetTimeout( () => {\r\n\t\t\tconst { deferreds } = this,\r\n\t\t\t\t{ keys } = deferreds,\r\n\t\t\t\tdeferredPromises = [];\r\n\t\t\tif( keys.length <= 0 ) return;\r\n\r\n\t\t\tfunction process( results: ArrayLike<T|PromiseLike<T>> ) {\r\n\t\t\t\tArray.from( results ).forEach( ( result, key ) => {\r\n\t\t\t\t\tconst deferredPromise = deferredPromises[ key ];\r\n\t\t\t\t\tdeferredPromise.resolve( result );\r\n\t\t\t\t} );\r\n\t\t\t}\r\n\r\n\t\t\tfor( let key of keys ) {\r\n\t\t\t\tdeferredPromises.push( deferreds.get( key ) );\r\n\t\t\t\tdeferreds.unset( key );\r\n\t\t\t}\r\n\t\t\tconst results = this.batch( Array.from( keys ) );\r\n\t\t\tif( isPromiseLike<ArrayLike<T>>( results ) ) {\r\n\t\t\t\tresults.then( arr => process( arr ) );\r\n\t\t\t} else {\r\n\t\t\t\tprocess( results );\r\n\t\t\t}\r\n\t\t}, 0 );\r\n\t}\r\n\r\n\tprivate deferreds = new SimpleCache<CacheKey,DeferredPromise<T>>();\r\n}\r\n\r\nexport class StorageCache<CacheKey,T> implements ICache<CacheKey,T> {\r\n\tconstructor( storage: IDictionary<T>|Storage, namespace?: string ) {\r\n\t\tthis.namespace = namespace || '';\r\n\t\tthis.storage = storage;\r\n\t}\r\n\r\n\tpublic unset( key: CacheKey ) {\r\n\t\tconst cacheKey = this.getCacheKey( key ),\r\n\t\t\tstorage = this.storage;\r\n\t\tif( isStorage( storage ) ) {\r\n\t\t\tstorage.removeItem( cacheKey );\r\n\t\t} else {\r\n\t\t\treturn delete this.storage[ cacheKey ];\r\n\t\t}\r\n\t}\r\n\r\n\tpublic set( key: CacheKey, value: T ) {\r\n\t\tconst cacheKey = this.getCacheKey( key ),\r\n\t\t\tserializedValue = this.valueSerializationStrategy.serialize( value ),\r\n\t\t\tstorage = this.storage;\r\n\t\tif( isStorage( storage ) ) {\r\n\t\t\tstorage.setItem( cacheKey, serializedValue );\r\n\t\t} else {\r\n\t\t\tthis.storage[ cacheKey ] = serializedValue;\r\n\t\t}\r\n\t}\r\n\r\n\tpublic get( key: CacheKey ): T {\r\n\t\tconst cacheKey = this.getCacheKey( key ),\r\n\t\t\tstorage = this.storage;\r\n\t\tif( isStorage( storage ) ) {\r\n\t\t\treturn this.valueSerializationStrategy.deserialize( storage.getItem( cacheKey ) );\r\n\t\t} else {\r\n\t\t\treturn this.valueSerializationStrategy.deserialize( this.storage[ cacheKey ] );\r\n\t\t}\r\n\t}\r\n\r\n\tpublic get keys() {\r\n\t\tconst namespace = this.namespace;\r\n\t\tlet allKeys = Object.keys( this.storage );\r\n\t\t\t\r\n\t\tif( namespace ) {\r\n\t\t\tconst prefix = `${namespace}$`,\r\n\t\t\t\tprefixLength = prefix.length;\r\n\t\t\tallKeys = allKeys.filter( key => key.startsWith( prefix ) ).map( key => key.substring( prefixLength ) );\r\n\t\t}\r\n\r\n\t\treturn allKeys.map( s => this.keySerializationStrategy.deserialize( s ) );\r\n\t}\r\n\r\n\tpublic containsKey( key: CacheKey ) {\r\n\t\treturn this.getCacheKey( key ) in this.storage;\r\n\t}\r\n\r\n\tpublic clear() {\r\n\t\tfor( let key of Array.from( this.keys ) ) {\r\n\t\t\tthis.unset( key );\r\n\t\t}\r\n\t}\r\n\r\n\tprotected getCacheKey( key: CacheKey ) {\r\n\t\tconst { namespace } = this,\r\n\t\t\tsuffix = this.keySerializationStrategy.serialize( key );\r\n\t\tif( namespace ) {\r\n\t\t\treturn `${namespace}$${suffix}`;\r\n\t\t} else {\r\n\t\t\treturn suffix;\r\n\t\t}\r\n\t}\r\n\r\n\tprotected keySerializationStrategy: ISerializationStrategy<CacheKey, any> = new JsonSerializationStrategy<CacheKey>();\r\n\tprotected valueSerializationStrategy: ISerializationStrategy<T, any> = new IdentitySerializationStrategy<T>();\r\n\tprotected namespace: string;\r\n\tprotected storage: CacheStore<T>;\r\n}\r\n\r\nexport class SimpleCache<CacheKey,T> extends StorageCache<CacheKey,T> {\r\n\tconstructor() {\r\n\t\tsuper( {} );\r\n\t}\r\n}\r\n\r\nexport class LocalStorageCache<CacheKey,T> extends StorageCache<CacheKey,T> {\r\n\tconstructor( namespace?: string ) {\r\n\t\tsuper( localStorage || {}, namespace );\r\n\t}\r\n\r\n\tprotected valueSerializationStrategy: ISerializationStrategy<T, string> = new JsonSerializationStrategy<T>();\r\n}\r\n\r\nexport class SessionStorageCache<CacheKey,T> extends StorageCache<CacheKey,T> {\r\n\tconstructor( namespace?: string ) {\r\n\t\tsuper( sessionStorage || {}, namespace );\r\n\t}\r\n\r\n\tprotected valueSerializationStrategy: ISerializationStrategy<T, string> = new JsonSerializationStrategy<T>();\r\n}\r\n\r\nexport class Lazy<T> {\r\n\tconstructor( getter: ( ...args: Array<any> ) => T, ...getterParams: Array<any> ) {\r\n\t\tthis._getter = getter;\r\n\t\tthis._getterParams = getterParams;\r\n\t}\r\n\r\n\tpublic get value() {\r\n\t\tif( !this._hasValue ) {\r\n\t\t\tthis._value = this._getter.apply( this, this._getterParams );\r\n\t\t\tdelete this._getterParams;\r\n\t\t\tthis._hasValue = true;\r\n\t\t}\r\n\t\treturn this._value;\r\n\t}\r\n\r\n\tpublic get hasValue() {\r\n\t\treturn this._hasValue;\r\n\t}\r\n\r\n\tprivate _getter: () => T;\r\n\tprivate _getterParams: Array<any>;\r\n\tprivate _value: T;\r\n\tprivate _hasValue = false;\r\n}\r\n"]}