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FailoverExample.js
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FailoverExample.js
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
const IgniteClient = require('apache-ignite-client');
const IgniteClientConfiguration = IgniteClient.IgniteClientConfiguration;
const ENDPOINT1 = 'localhost:10800';
const ENDPOINT2 = 'localhost:10801';
const ENDPOINT3 = 'localhost:10802';
// This example demonstrates failover behavior of the client
// - configures the client to connect to a set of nodes
// - connects to a node
// - if connection is broken, the client automatically tries to reconnect to another node
// - if no specified nodes are available, stops the client
async function connectClient() {
const igniteClient = new IgniteClient(onStateChanged);
igniteClient.setDebug(true);
try {
const igniteClientConfiguration = new IgniteClientConfiguration(
ENDPOINT1, ENDPOINT2, ENDPOINT3);
// connect to Ignite a node
await igniteClient.connect(igniteClientConfiguration);
}
catch (err) {
console.log(err.message);
}
}
function onStateChanged(state, reason) {
if (state === IgniteClient.STATE.CONNECTED) {
console.log('Client is started');
}
else if (state === IgniteClient.STATE.CONNECTING) {
console.log('Client is connecting');
}
else if (state === IgniteClient.STATE.DISCONNECTED) {
console.log('Client is stopped');
if (reason) {
console.log(reason);
}
}
}
connectClient();