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CachePutGetExample.js
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CachePutGetExample.js
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/*
* Copyright 2019 GridGain Systems, Inc. and Contributors.
*
* Licensed under the GridGain Community Edition License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.gridgain.com/products/software/community-edition/gridgain-community-edition-license
*
* 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.
*/
const IgniteClient = require('apache-ignite-client');
const ObjectType = IgniteClient.ObjectType;
const ComplexObjectType = IgniteClient.ComplexObjectType;
const BinaryObject = IgniteClient.BinaryObject;
const CacheEntry = IgniteClient.CacheEntry;
const ScanQuery = IgniteClient.ScanQuery;
const IgniteClientConfiguration = IgniteClient.IgniteClientConfiguration;
const ENDPOINT = '127.0.0.1:10800';
const CACHE_NAME = 'CachePutGetExample_person';
const PERSON_TYPE_NAME = 'Person';
class Person {
constructor(firstName = null, lastName = null, salary = null) {
this.id = Person.generateId();
this.firstName = firstName;
this.lastName = lastName;
this.salary = salary;
}
static generateId() {
if (!Person.id) {
Person.id = 0;
}
const id = Person.id;
Person.id++;
return id;
}
}
// This example demonstrates basic Cache, Key-Value Queries and Scan Query operations:
// - connects to a node
// - creates a cache, if it doesn't exist
// - specifies key type as Integer
// - executes different cache operations with Complex Objects and Binary Objects
// - put several objects in parallel
// - putAll
// - get
// - getAll
// - ScanQuery
// - destroys the cache
class CachePutGetExample {
constructor() {
this._personCache = null;
this._personObjectType = null;
this._binaryObjectCache = null;
}
async start() {
const igniteClient = new IgniteClient(this.onStateChanged.bind(this));
try {
await igniteClient.connect(new IgniteClientConfiguration(ENDPOINT));
this._personObjectType = new ComplexObjectType(new Person(), PERSON_TYPE_NAME).
setFieldType('id', ObjectType.PRIMITIVE_TYPE.INTEGER);
this._personCache = (await igniteClient.getOrCreateCache(CACHE_NAME)).
setKeyType(ObjectType.PRIMITIVE_TYPE.INTEGER).
setValueType(this._personObjectType);
this._binaryObjectCache = igniteClient.getCache(CACHE_NAME).
setKeyType(ObjectType.PRIMITIVE_TYPE.INTEGER);
await this.putComplexObjects();
await this.putAllBinaryObjects();
await this.getAllComplexObjects();
await this.getBinaryObjects();
await this.scanQuery();
await igniteClient.destroyCache(CACHE_NAME);
}
catch (err) {
console.log('ERROR: ' + err.message);
}
finally {
igniteClient.disconnect();
}
}
async putComplexObjects() {
const person1 = new Person('John', 'Doe', 1000);
const person2 = new Person('Jane', 'Roe', 2000);
// put multiple values in parallel
await Promise.all([
await this._personCache.put(person1.id, person1),
await this._personCache.put(person2.id, person2)
]);
console.log('Complex Objects put successfully');
}
async putAllBinaryObjects() {
// create binary object from scratch
const personBinaryObject1 = new BinaryObject(PERSON_TYPE_NAME).
setField('id', Person.generateId(), ObjectType.PRIMITIVE_TYPE.INTEGER).
setField('firstName', 'Mary').
setField('lastName', 'Major').
setField('salary', 1500);
// create binary object from complex object
const personBinaryObject2 = await BinaryObject.fromObject(
new Person('Richard', 'Miles', 800), this._personObjectType);
await this._binaryObjectCache.putAll([
new CacheEntry(await personBinaryObject1.getField('id'), personBinaryObject1),
new CacheEntry(await personBinaryObject2.getField('id'), personBinaryObject2)
]);
console.log('Binary Objects put successfully using putAll()');
}
async getAllComplexObjects() {
const persons = await this._personCache.getAll([2, 3]);
console.log('Complex Objects getAll:');
for (let person of persons) {
this.printPersonObject(person.getValue());
}
}
async getBinaryObjects() {
const personBinaryObject = await this._binaryObjectCache.get(3);
console.log('Binary Object get:');
console.log(' ' + personBinaryObject.getTypeName());
let fieldValue;
for (let fieldName of personBinaryObject.getFieldNames()) {
fieldValue = await personBinaryObject.getField(fieldName);
this.printPersonField(fieldName, fieldValue);
}
}
async scanQuery() {
const cursor = await this._personCache.query(new ScanQuery());
console.log('Scan query results:');
for (let cacheEntry of await cursor.getAll()) {
this.printPersonObject(cacheEntry.getValue());
}
}
onStateChanged(state, reason) {
if (state === IgniteClient.STATE.CONNECTED) {
console.log('Client is started');
}
else if (state === IgniteClient.STATE.DISCONNECTED) {
console.log('Client is stopped');
if (reason) {
console.log(reason);
}
}
}
printPersonObject(person) {
console.log(' ' + PERSON_TYPE_NAME);
for (let key in person) {
this.printPersonField(key, person[key]);
}
}
printPersonField(fieldName, fieldValue) {
console.log(' ' + fieldName + ' : ' + fieldValue);
}
}
const cachePutGetExample = new CachePutGetExample();
cachePutGetExample.start();