Add option to re-use schema cache between requests (#2979)

* Add option to reuse database controller between requests. Clear schema cache when deleting everything

* Add test

* Rename setting to persistSchemaCache to more accurately reflect effect

* Repurpose option to determine whether to randomize cache prefix. Restore Config.js controller creation. Add tests

* Fix bug with missing parameter passed to to SchemaCache

* Renaming and formatting

* Fix property name typo

* Rename option to avoid double negative and still be falsey by default. Style fix

spec/SchemaCache.spec.js

@@ -3,35 +3,66 @@ var InMemoryCacheAdapter = require('../src/Adapters/Cache/InMemoryCacheAdapter')
 var SchemaCache = require('../src/Controllers/SchemaCache').default;
 
 describe('SchemaCache', () => {
-	var schemaCache;
+  let cacheController;
 
-	beforeEach(() => {
-		var cacheAdapter = new InMemoryCacheAdapter({});
-		var cacheController = new CacheController(cacheAdapter, 'appId');
-		schemaCache = new SchemaCache(cacheController);
-	});
+  beforeEach(() => {
+    const cacheAdapter = new InMemoryCacheAdapter({});
+    cacheController = new CacheController(cacheAdapter, 'appId');
+  });
 
-	it('can retrieve a single schema after all schemas stored', (done) => {
-		var allSchemas = [{
-			className: 'Class1'
-		}, {
-			className: 'Class2'
-		}];
-		schemaCache.setAllClasses(allSchemas);
-		schemaCache.getOneSchema('Class2').then((schema) => {
-			expect(schema).not.toBeNull();
-			done();
-		});
-	});
+  it('can retrieve a single schema after all schemas stored', (done) => {
+    const schemaCache = new SchemaCache(cacheController);
+    const allSchemas = [{
+      className: 'Class1'
+    }, {
+      className: 'Class2'
+    }];
+    schemaCache.setAllClasses(allSchemas).then(() => {
+      return schemaCache.getOneSchema('Class2');
+    }).then((schema) => {
+      expect(schema).not.toBeNull();
+      done();
+    });
+  });
 
-	it('does not return all schemas after a single schema is stored', (done) => {
-		var schema = {
-			className: 'Class1'
-		};
-		schemaCache.setOneSchema('Class1', schema);
-		schemaCache.getAllClasses().then((allSchemas) => {
-			expect(allSchemas).toBeNull();
-			done();
-		});
-	});
+  it('does not return all schemas after a single schema is stored', (done) => {
+    const schemaCache = new SchemaCache(cacheController);
+    const schema = {
+      className: 'Class1'
+    };
+    schemaCache.setOneSchema(schema.className, schema).then(() => {
+      return schemaCache.getAllClasses();
+    }).then((allSchemas) => {
+      expect(allSchemas).toBeNull();
+      done();
+    });
+  });
+
+  it('doesn\'t persist cached data by default', (done) => {
+    const schemaCache = new SchemaCache(cacheController);
+    const schema = {
+      className: 'Class1'
+    };
+    schemaCache.setOneSchema(schema.className, schema).then(() => {
+      const anotherSchemaCache = new SchemaCache(cacheController);
+      return anotherSchemaCache.getOneSchema(schema.className).then((schema) => {
+        expect(schema).toBeNull();
+        done();
+      });
+    });
+  });
+
+  it('can persist cached data', (done) => {
+    const schemaCache = new SchemaCache(cacheController, 5000, true);
+    const schema = {
+      className: 'Class1'
+    };
+    schemaCache.setOneSchema(schema.className, schema).then(() => {
+      const anotherSchemaCache = new SchemaCache(cacheController, 5000, true);
+      return anotherSchemaCache.getOneSchema(schema.className).then((schema) => {
+        expect(schema).not.toBeNull();
+        done();
+      });
+    });
+  });
 });