---
title: Composer multiblock provider
---
Package: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;com.codex.composer.api.v1.datagen <br/>
Canonical Name: com.codex.composer.api.v1.datagen.ComposerMultiblockProvider

Simple server data generation provider for composer's multiblock system.

Inheritors have to implement:
```java
void generate(DataWriter writer);
```
Creation of multiblock builders can me done with:
```java
/* Creates a new MultiblockJsonBuilder. Once finished with setting parameters. use .write(DataWriter) to write it to disk. */
MultiblockJsonBuilder create(Identifier id);
```

## Example Implementation:
**From [Starstruck](https://github.com/LilBroCodes/starstruck) (Code currently private, sorry)**
```java
public class ModMultiblockProvider extends ComposerMultiblockProvider {
    public ModMultiblockProvider(FabricDataOutput output) {...}

    @Override
    public void generate(DataWriter writer) {
        create(ModMultiblocks.KILN)
                .layer() // Creates a new layer builder
                    .rows("BBB", 3) // Second parameter repeats that line n times
                    .end() // -> MultiblockJsonBuilder
                .layer()
                    .row("BBB")
                    .row("B B")
                    .row("BFB") // Here, the F is the controller at the second column of the second layer, first row, thus (1, 1, 0)
                    .end()
                .layer()
                    .row("BBB")
                    .row("B B")
                    .row("BBB")
                    .end()
                .layer()
                    .row("*B*")
                    .row("B B")
                    .row("*B*")
                    .repeat(2) // Repeats the layer n times, then -> MultiblockJsonBuilder
                .layer()
                    .row("***") // Stars count as any block,
                    .row("* *") // Spaces count as air.
                    .row("***")
                    .end()
                .controller(new Vec3i(1, 1, 0)) // Position of the controller related to bottom-left, 0-indexed. X is left->right, y is bottom->top and z is front->back
                .pattern('B').block(FIRE_BRICKS)
                .pattern('F').block(KILN) // can also be .tag(TagKey<Block>) -> MultiblockJsonBuilder
                .write(writer);
    }
}