update from RIFT as of 696b75d2fe9fb046261b08c616f1bcf6c0b54a9b third try

[osm/UI.git] / skyquake / framework / source / SourceCache.js

diff --git a/skyquake/framework/source/SourceCache.js b/skyquake/framework/source/SourceCache.js
new file mode 100644 (file)
index 0000000..ded3c9d
--- /dev/null
+++ b/skyquake/framework/source/SourceCache.js
@@ -0,0 +1,96 @@
+/*
+ * 
+ *   Copyright 2017 RIFT.IO Inc
+ *
+ *   Licensed under the Apache License, Version 2.0 (the "License");
+ *   you may not use this file except in compliance with the License.
+ *   You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   Unless required by applicable law or agreed to in writing, software
+ *   distributed under the License is distributed on an "AS IS" BASIS,
+ *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *   See the License for the specific language governing permissions and
+ *   limitations under the License.
+ *
+ */
+import appConfiguration from '../utils/appConfiguration'
+
+let versionKeyPrefix = null;
+
+const localCache = new class {
+    get(key) {
+        let valueAsString = localStorage.getItem(key);
+        return valueAsString ? JSON.parse(valueAsString) : undefined;
+    }
+    set(key, val) {
+        localStorage.setItem(key, typeof val === 'string' ? val : JSON.stringify(val));
+    }
+}();
+
+let objCache = new Map();
+
+const storeCache = new class {
+    get(key) {
+        if (objCache[key]) {
+            objCache[key].timerId && clearTimeout(objCache[key].timerId)
+            objCache[key].timerId = setTimeout((key) => delete objCache[key], 2000)
+            return objCache[key].value;
+        } 
+        const obj = localCache.get(key);
+        if (obj) {
+            objCache[key] = {
+                value: obj,
+                timerId: setTimeout((key) => delete objCache[key], 2000)
+            }
+            return obj;
+        }
+    }
+    set(key, obj) {
+        setTimeout(localCache.set, 100, key, obj);
+        objCache[key] = {
+            value: obj,
+            timerId: setTimeout((key) => delete objCache[key], 2000)
+        }
+    }
+    init(version) {
+        versionKeyPrefix = 's-v-' + version;
+        const currentStoreVersion = localStorage.getItem('store-version');
+        if (currentStoreVersion !== version) {
+            let removeItems = [];
+            for (let i = 0; i < localStorage.length; ++i) {
+                let key = localStorage.key(i);
+                if (key.startsWith('s-v-')) {
+                    removeItems.push(key);
+                }
+            }
+            removeItems.forEach((key) => localStorage.removeItem(key));
+            localStorage.setItem('store-version', version);
+        }
+    }
+}();
+
+class StoreCache {
+    constructor(name) {
+        this.name = 's-v-' + name;
+    }
+    get(key) {
+        return storeCache.get(this.name + key);
+    }
+    set(key, obj) {
+        storeCache.set(this.name + key, obj);
+    }
+    init() {
+        return versionKeyPrefix ? Promise.resolve() : new Promise(
+            (resolve, reject) => {
+                appConfiguration.get().then((config) => {
+                    storeCache.init(config.version);
+                    resolve();
+                })
+            }
+        )
+    }
+}
+
+module.exports = StoreCache;
\ No newline at end of file