103 lines
2.8 KiB
JavaScript
103 lines
2.8 KiB
JavaScript
/* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. */
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/******************************************************************************
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*
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* You may not use the identified files except in compliance with the Apache
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* License, Version 2.0 (the "License.")
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*
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0.
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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*
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* NAME
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* aqoptions.js
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*
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* DESCRIPTION
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* Oracle Advanced Queuing (AQ) example setting options and message attributes.
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*
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* Before running this, a queue allowing RAW payloads must be
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* created, see https://oracle.github.io/node-oracledb/doc/api.html#aqrawexample
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*
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* This example requires node-oracledb 4 or later.
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*
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* This example uses Node 8's async/await syntax.
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*
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*****************************************************************************/
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const oracledb = require('oracledb');
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const dbConfig = require('./dbconfig.js');
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const queueName = "DEMO_RAW_QUEUE";
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async function enq() {
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let connection;
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try {
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connection = await oracledb.getConnection(dbConfig);
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const queue = await connection.getQueue(queueName);
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queue.enqOptions.visibility = oracledb.AQ_VISIBILITY_IMMEDIATE; // Send a message immediately without requiring a commit
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const messageString = 'This is my other message';
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const message = {
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payload: messageString, // the message itself
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expiration: 1 // seconds the message will remain in the queue if not dequeued
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};
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console.log('Enqueuing: ' + messageString);
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await queue.enqOne(message);
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} catch (err) {
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console.error(err);
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} finally {
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if (connection) {
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try {
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await connection.close();
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} catch (err) {
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console.error(err);
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}
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}
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}
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}
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async function deq() {
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let connection;
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try {
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connection = await oracledb.getConnection(dbConfig);
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const queue = await connection.getQueue(queueName);
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Object.assign(
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queue.deqOptions,
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{
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visibility: oracledb.AQ_VISIBILITY_IMMEDIATE, // Change the visibility so no explicit commit is required
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wait: 5 // Only wait 5 seconds if there are no messages
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}
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);
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const msg = await queue.deqOne();
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if (msg) {
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console.log('Dequeued: ' + msg.payload.toString());
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} else {
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console.log('No message to dequeue');
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}
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} catch (err) {
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console.error(err);
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} finally {
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if (connection) {
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try {
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await connection.close();
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} catch (err) {
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console.error(err);
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}
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}
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}
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}
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enq();
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deq();
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