Create class with Injectable Parameters

Question

Consider the following class:

class MongoDumpBuilder (recordingId: String, parquetService: ParquetService) {
...
}

I want to inject the parquetService, the problem is that I want to create MongoDumpBuilder as follows:

NOTE: I want to pass recordingId.stringify to the class

new MongoDumpBuilder(recordingId.stringify)
        .withPacificEvents(pacificEvents)
        .withAssets(assets)
        .withTransactions(transactions)
        .withReports(reports)
        .withExpenses(expenses)
        .build()

But this will work only with:

new MongoDumpBuilder(recordingId.stringify, parquetService)

If i will do MongoDumpBuilder with Inject i cannot create it

class MongoDumpBuilder @Inject()(recordingId: String, parquetService: ParquetService) {
???
}

Any ideas how to solve it?

Tomer Shetah · Accepted Answer · 2021-03-10 12:26:21Z

1

You can use naming in order to bind recordingId. Add this to your Module:

bind(classOf[String]).annotatedWith(Names.named("recordingId")).toInstance(recordingId.stringify)

Then define your class:

class MongoDumpBuilder @Inject()(@Named("recordingId") val recordingId: String, parquetService: ParquetService) {
...
}

answered Mar 10, 2021 at 12:26

Tomer Shetah

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5 Comments

Zvi Mints Over a year ago

Oh, thanks but thats will not work for me, since there mongoDumpBuilder for a lot of different recordingIds.

Tomer Shetah Over a year ago

@ZviMints do you have a single ParquetService?

Zvi Mints Over a year ago

Its singleton but its not an object, its inject other dependenceis

Tomer Shetah Over a year ago

@ZviMints Then I don't think you are doing a good usage of guice. Since you have a lot of recordingIds, it shouldn't be a class parameter, but a method. You should create one instance of MongoDumpBuilder, and pass inside the recordingId.

Zvi Mints Over a year ago

I got your advise, I changed the ParquetService to be object without dependences, Thanks as always :)

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