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Normalize the stream and table modules
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| 'use strict'; | ||
|
|
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| const PollingConsumer = require('./polling-consumer'); | ||
|
|
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| const privateData = new WeakMap(); | ||
|
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| function internal(instance) { | ||
| if (!privateData.has(instance)) privateData.set(instance, {}); | ||
| return privateData.get(instance); | ||
| } | ||
|
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| class ConsumersManager { | ||
| constructor(options) { | ||
| const { | ||
| client, | ||
| compression, | ||
| streamName, | ||
| logger, | ||
| pushToStream, | ||
| stateStore, | ||
| useEnhancedFanOut | ||
| } = options; | ||
|
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| Object.assign(internal(this), { | ||
| client, | ||
| compression, | ||
| consumers: {}, | ||
| logger, | ||
| stateStore, | ||
| pushToStream, | ||
| streamName, | ||
| useEnhancedFanOut | ||
| }); | ||
| } | ||
|
|
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| async reconcile() { | ||
| const { | ||
| client, | ||
| consumers, | ||
| compression, | ||
| pushToStream, | ||
| logger, | ||
| stateStore, | ||
| streamName, | ||
| useEnhancedFanOut | ||
| } = internal(this); | ||
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| logger.debug('Reconciling shard consumers…'); | ||
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| if (useEnhancedFanOut) { | ||
| throw new Error('The fan-out consumers are not supported yet.'); | ||
| } | ||
|
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| const ownedShards = await stateStore.getOwnedShards(); | ||
| const ownedShardIds = Object.keys(ownedShards); | ||
|
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| // Start consumers for the shards the consumer owns. | ||
| ownedShardIds.forEach(shardId => { | ||
| if (!consumers[shardId]) { | ||
| const shard = ownedShards[shardId]; | ||
| const consumer = new PollingConsumer({ | ||
| client, | ||
| compression, | ||
| pushToStream, | ||
| logger, | ||
| shardId, | ||
| streamName, | ||
| ...shard | ||
| }); | ||
| consumers[shardId] = consumer; | ||
| consumer.start(); | ||
| } | ||
| }); | ||
|
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| // Stop the consumers whose leases were lost. | ||
| Object.keys(consumers) | ||
| .filter(shardId => !ownedShards[shardId]) | ||
| .forEach(async shardId => { | ||
| await consumers[shardId].stop(); | ||
| consumers[shardId] = undefined; | ||
| }); | ||
| } | ||
| } | ||
|
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| module.exports = ConsumersManager; |
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