Comments (3)
Hi @x48115,
A couple of things...
- You should await the prefetch operation
- You need to cancel the consumer, change the prefetch, then reconsume
An alternative you might consider is to use channel.get
from amqplib.
Another alternative is to add the global flag to the prefetch calls and not rely on individual consumer prefetch...
channel.prefetch(100, true);
However, this means that all consumers using the channel will share the same prefetch, which may not be appropriate
from amqplib.
Thanks @cressie176 I was able to make it work by cancelling the consumer, updating prefetch and resubscrbing:
class Consumer {
async open() {
try {
this.pendingContent = [];
this.batchSize = 5;
this.channel = await app.queue.connection.createChannel();
await this.channel.assertQueue(BLOCKS_QUEUE, { durable: false });
await this.channel.prefetch(this.batchSize);
} catch (error) {
console.error("Error:", error);
}
}
async read() {
this.channel.consume(BLOCKS_QUEUE, async (message) => {
let messageContent = Number(message.content.toString());
console.log("Received message:", messageContent);
this.pendingContent.push(messageContent);
if (this.pendingContent.length >= this.batchSize) {
console.log("Pending content", this.pendingContent);
await delay(1000);
this.pendingContent = [];
if (shouldResize) {
this.batchSize = 3;
await this.channel.cancel(message.fields.consumerTag);
await this.channel.prefetch(this.batchSize);
this.channel.ackAll();
this.read();
return;
}
this.channel.ackAll();
}
});
}
}
from amqplib.
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from amqplib.