ReferenceCollector (muzzle 1.7.1 API)

java.lang.Object
- io.opentelemetry.javaagent.tooling.muzzle.ReferenceCollector

```
public final class ReferenceCollector
extends Object
```
LinkedHashMap is used for reference map to guarantee a deterministic order of iteration, so that bytecode generated based on it would also be deterministic.
This class is only called at compile time by the MuzzleCodeGenerationPlugin ByteBuddy plugin.

Constructor Summary

Constructors
Constructor Description

ReferenceCollector(Predicate<String> libraryInstrumentationPredicate, ClassLoader resourceLoader)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`collectReferencesFromAdvice(String adviceClassName)`	Traverse a graph of classes starting from `adviceClassName` and collect all references to both internal (instrumentation) and external classes.
`void`	`collectReferencesFromResource(HelperResource helperResource)`	If passed `resource` path points to an SPI file (either Java `ServiceLoader` or AWS SDK `ExecutionInterceptor`) reads the file and adds every implementation as a reference, traversing the graph of classes until a non-instrumentation (external) class is encountered.
`Map<String,ClassRef>`	`getReferences()`
`List<String>`	`getSortedHelperClasses()`
`VirtualFieldMappings`	`getVirtualFieldMappings()`
`void`	`prune()`

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

- Constructor Detail
  - ReferenceCollector
```
public ReferenceCollector(Predicate<String> libraryInstrumentationPredicate,
                          ClassLoader resourceLoader)
```
- Method Detail
  - collectReferencesFromResource
```
public void collectReferencesFromResource(HelperResource helperResource)
```
    If passed resource path points to an SPI file (either Java ServiceLoader or AWS SDK ExecutionInterceptor) reads the file and adds every implementation as a reference, traversing the graph of classes until a non-instrumentation (external) class is encountered.
    
    See Also:
    
    HelperClassPredicate
  - collectReferencesFromAdvice
```
public void collectReferencesFromAdvice(String adviceClassName)
```
    Traverse a graph of classes starting from adviceClassName and collect all references to both internal (instrumentation) and external classes.
    The graph of classes is traversed until a non-instrumentation (external) class is encountered.
    
    Parameters:
    
    adviceClassName - Starting point for generating references.
    
    See Also:
    
    HelperClassPredicate
  - getReferences
```
public Map<String,ClassRef> getReferences()
```
  - prune
```
public void prune()
```
  - getSortedHelperClasses
```
public List<String> getSortedHelperClasses()
```
  - getVirtualFieldMappings
```
public VirtualFieldMappings getVirtualFieldMappings()
```