@fireflysemantics/slice
Version:
145 lines • 13.5 kB
JavaScript
import { ReplaySubject } from 'rxjs';
export class OStore {
constructor(start) {
/**
* Map of Key Value pair entries
* containing values store in this store.
*/
this.entries = new Map();
/**
* Map of replay subject id to `ReplaySubject` instance.
*/
this.subjects = new Map();
if (start) {
this.S = start;
const keys = Object.keys(start);
keys.forEach((k) => {
const ovr = start[k];
this.post(ovr, ovr.value);
ovr.obs = this.observe(ovr);
});
}
}
/**
* Reset the state of the OStore to the
* values or reset provided in the constructor
* {@link OStoreStart} instance.
*/
reset() {
if (this.S) {
const keys = Object.keys(this.S);
keys.forEach((k) => {
const ovr = this.S[k];
this.put(ovr, ovr.reset ? ovr.reset : ovr.value);
});
}
}
/**
* Set create a key value pair entry and creates a
* corresponding replay subject instance that will
* be used to broadcast updates.
*
* @param key The key identifying the value
* @param value The value
*/
post(key, value) {
this.entries.set(key, value);
this.subjects.set(key, new ReplaySubject(1));
//Emit immediately so that Observers can receive
//the value straight away.
const subject = this.subjects.get(key);
if (subject) {
subject.next(value);
}
}
/**
* Update a value and notify subscribers.
*
* @param key
* @param value
*/
put(key, value) {
this.entries.set(key, value);
const subject = this.subjects.get(key);
if (subject) {
subject.next(value);
}
}
/**
* Deletes both the value entry and the corresponding {@link ReplaySubject}.
* Will unsubscribe the {@link ReplaySubject} prior to deleting it,
* severing communication with corresponding {@link Observable}s.
*
* @param key
*/
delete(key) {
//===========================================
// Delete the entry
//===========================================
this.entries.delete(key);
const subject = this.subjects.get(key);
if (subject) {
subject.next(undefined);
}
}
/**
* Clear all entries.
*
* Note that
* this will call delete for on all
* keys defined which also also
* unsubscribes and deletes
* all the sbujects.
*/
clear() {
for (let key of this.entries.keys()) {
this.delete(key);
}
}
/**
* Observe changes to the values.
*
* @param key
* @return An {@link Observable} of the value
*/
observe(key) {
return this.subjects.get(key)
? this.subjects.get(key).asObservable()
: undefined;
}
/**
* Check whether a value exists.
*
* @param key
* @return True if the entry exists ( Is not null or undefined ) and false otherwise.
*/
exists(key) {
return !!this.entries.get(key);
}
/**
* Retrieve a snapshot of the
* value.
*
* @param key
* @return A snapshot of the value corresponding to the key.
*/
snapshot(key) {
return this.entries.get(key);
}
/**
* Indicates whether the store is empty.
* @return true if the store is empty, false otherwise.
*/
isEmpty() {
return Array.from(this.entries.values()).length == 0;
}
/**
* Returns the number of key value pairs contained.
*
* @return the number of entries in the store.
*/
count() {
return Array.from(this.entries.values()).length;
}
}
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ovr.reset : ovr.value);\n      });\n    }\n  }\n\n  /**\n   * Map of Key Value pair entries\n   * containing values store in this store.\n   */\n  public entries: Map<any, any> = new Map();\n\n  /**\n   * Map of replay subject id to `ReplaySubject` instance.\n   */\n  private subjects: Map<any, ReplaySubject<any>> = new Map();\n\n  /**\n   * Set create a key value pair entry and creates a\n   * corresponding replay subject instance that will\n   * be used to broadcast updates.\n   *\n   * @param key The key identifying the value\n   * @param value The value\n   */\n  private post(key: ObsValueReset, value: any) {\n    this.entries.set(key, value);\n    this.subjects.set(key, new ReplaySubject(1));\n    //Emit immediately so that Observers can receive\n    //the value straight away.\n    const subject = this.subjects.get(key);\n    if (subject) {\n      subject.next(value);\n    }\n  }\n  /**\n   * Update a value and notify subscribers.\n   *\n   * @param key\n   * @param value\n   */\n  public put(key: any, value: any) {\n    this.entries.set(key, value);\n    const subject = this.subjects.get(key);\n    if (subject) {\n      subject.next(value);\n    }\n  }\n\n  /**\n   * Deletes both the value entry and the corresponding {@link ReplaySubject}.\n   * Will unsubscribe the {@link ReplaySubject} prior to deleting it,\n   * severing communication with corresponding {@link Observable}s.\n   *\n   * @param key\n   */\n  public delete(key: any) {\n    //===========================================\n    // Delete the entry\n    //===========================================\n    this.entries.delete(key);\n    const subject = this.subjects.get(key);\n    if (subject) {\n      subject.next(undefined);\n    }\n  }\n\n  /**\n   * Clear all entries.  \n   * \n   * Note that \n   * this will call delete for on all\n   * keys defined which also also \n   * unsubscribes and deletes \n   * all the sbujects.\n   */\n  public clear() {\n    for (let key of this.entries.keys()) {\n        this.delete(key);\n    }\n  }\n\n  /**\n   * Observe changes to the values.\n   *\n   * @param key\n   * @return An {@link Observable} of the value\n   */\n  public observe(key: any): Observable<any> | undefined {\n    return this.subjects.get(key)\n      ? this.subjects.get(key)!.asObservable()\n      : undefined;\n  }\n\n  /**\n   * Check whether a value exists.\n   *\n   * @param key\n   * @return True if the entry exists ( Is not null or undefined ) and false otherwise.\n   */\n  public exists(key: any): boolean {\n    return !!this.entries.get(key);\n  }\n\n  /**\n   * Retrieve a snapshot of the\n   * value.\n   *\n   * @param key\n   * @return A snapshot of the value corresponding to the key.\n   */\n  public snapshot(key: any): any {\n    return this.entries.get(key);\n  }\n\n  /**\n   * Indicates whether the store is empty.\n   * @return true if the store is empty, false otherwise.\n   */\n  public isEmpty() {\n    return Array.from(this.entries.values()).length == 0;\n  }\n\n  /**\n   * Returns the number of key value pairs contained.\n   *\n   * @return the number of entries in the store.\n   */\n  public count() {\n    return Array.from(this.entries.values()).length;\n  }\n}"]}