MetaStoreShadowReader (venice API)

java.lang.Object
- com.linkedin.venice.router.api.MetaStoreShadowReader

```
public class MetaStoreShadowReader
extends java.lang.Object
```
This class serves as the shadow read handler of the meta system store.

Constructor Summary

Constructors
Constructor Description

MetaStoreShadowReader(ReadOnlySchemaRepository readOnlySchemaRepository)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`io.netty.handler.codec.http.FullHttpResponse`	`shadowReadMetaStore(VenicePath path, io.netty.handler.codec.http.FullHttpResponse originalResponse)`	This method performs shadow read for meta system store request in Router.
`boolean`	`shouldPerformShadowRead(VenicePath path, io.netty.handler.codec.http.FullHttpResponse response)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - MetaStoreShadowReader
```
public MetaStoreShadowReader(ReadOnlySchemaRepository readOnlySchemaRepository)
```
- Method Detail
  - shouldPerformShadowRead
```
public boolean shouldPerformShadowRead(VenicePath path,
                                       io.netty.handler.codec.http.FullHttpResponse response)
```
    Returns:
    
    True only if a meta store query request is indicated not found in the provided response returned from the storage replica.
  - shadowReadMetaStore
```
public io.netty.handler.codec.http.FullHttpResponse shadowReadMetaStore(VenicePath path,
                                                                        io.netty.handler.codec.http.FullHttpResponse originalResponse)
```
    This method performs shadow read for meta system store request in Router.
    
    Parameters:
    
    path - Request path for Meta Store metadata.
    
    originalResponse - Original response retrieved from storage replica.
    
    Returns:
    
    Updated FullHttpResponse with filled in content from metadata repository.