1 |
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2 | "use strict";
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3 |
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4 | const assert = require('assert');
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5 |
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6 | const NodeWeakHashmap = require('../util/nodeWeakHashmap');
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7 | const debug = require('debug')('upnpserver:db:cachedRegistry');
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8 |
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9 | const AbstractRegistry = require('./abstractRegistry');
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10 |
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11 | const CACHE_DELAY_MS = 1000 * 10;
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12 |
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13 | class CachedRegistry extends AbstractRegistry {
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14 |
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15 | |
16 |
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17 |
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18 | initialize(service, callback) {
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19 |
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20 | var garbage = (node, key, infos) => {
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21 | debug("intialize.garbage", "Garbage node #", node.id, infos.readCount);
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22 |
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23 | var sem = node._isLocked();
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24 | if (sem !== false) {
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25 | debug("intialize.garbage", "Not releasable #", node.id, "locked by semaphore=", sem);
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26 | this._map.put(node, node);
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27 | return;
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28 | }
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29 |
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30 | if (this._garbageNode) {
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31 | this._garbageNode(node);
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32 | }
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33 | };
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34 |
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35 | this._map = new NodeWeakHashmap("nodeById", CACHE_DELAY_MS, false, garbage);
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36 |
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37 | debug("intialize", "CachedRegistry initialized");
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38 |
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39 | super.initialize(service, callback);
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40 | }
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41 |
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42 | |
43 |
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44 |
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45 | clear(callback) {
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46 | assert(typeof(callback)==="function", "Invalid callback parameter");
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47 |
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48 | this._map.clear();
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49 |
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50 | debug("clear", "Clear all registry");
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51 |
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52 | callback(null);
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53 | }
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54 |
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55 | |
56 |
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57 |
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58 | saveNode(node, modifiedProperties, callback) {
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59 | this._map.put(node, node);
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60 |
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61 | debug("saveNode", "Put in cache node #", node.id);
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62 |
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63 | callback(null, node);
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64 | }
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65 |
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66 | |
67 |
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68 |
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69 | getNodeById(id, callback) {
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70 | assert(typeof(callback)==="function", "Invalid callback parameter");
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71 |
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72 | var node = this._map.get(id);
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73 |
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74 | debug("getNodeById", "Find node #", id, "=>", !!node);
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75 |
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76 | callback(null, node);
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77 | }
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78 |
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79 | |
80 |
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81 |
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82 | unregisterNode(node, callback) {
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83 | assert(typeof(callback)==="function", "Invalid callback parameter");
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84 |
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85 | this._map.remove(node);
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86 |
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87 | debug("unregisterNode", "Unregister node #", node.id);
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88 |
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89 | callback(null, node);
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90 | }
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91 | }
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92 |
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93 | module.exports = CachedRegistry;
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