QueryHandler (fabric-gateway-java 2.2.0 API)

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface QueryHandler
```
Handler responsible for evaluating a given query against appropriate peers. A single QueryHandler instance will be created for each Network instance so the query handler may maintain instance state across multiple queries.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`org.hyperledger.fabric.sdk.ProposalResponse`	`evaluate(Query query)`	Called when the result for a given query is required.

- Method Detail
  - evaluate
```
org.hyperledger.fabric.sdk.ProposalResponse evaluate(Query query)
                                              throws ContractException
```
    Called when the result for a given query is required.
    
    Parameters:
    
    query - The query to evaluate.
    
    Returns:
    
    The query result.
    
    Throws:
    
    ContractException - if no peers are reachable or an error response is returned.