# Class SimpleRelinkableCallSite

java.lang.Object
java.lang.invoke.CallSite
java.lang.invoke.MutableCallSite
jdk.dynalink.support.AbstractRelinkableCallSite
jdk.dynalink.support.SimpleRelinkableCallSite

All Implemented Interfaces:
  `RelinkableCallSite`

public class SimpleRelinkableCallSite extends AbstractRelinkableCallSite
A relinkable call site that implements monomorphic inline caching strategy, only being linked to a single `GuardedInvocation` at any given time. If the guard of that single invocation fails, or it has an invalidated switch point, or its invalidating exception triggered, then the call site will throw it away and ask its associated `DynamicLinker` to relink it.

Since:
  9

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `SimpleRelinkableCallSite(CallSiteDescriptor descriptor)`
  Creates a new call site with monomorphic inline caching strategy.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `relink(GuardedInvocation guardedInvocation, MethodHandle relinkAndInvoke)`
  This method will be called by the dynamic linker every time the call site is relinked (but see `RelinkableCallSite.resetAndRelink(GuardedInvocation, MethodHandle)` for an exception).
  `void`
  `resetAndRelink(GuardedInvocation guardedInvocation, MethodHandle relinkAndInvoke)`
  This method will be called by the dynamic linker every time the call site is relinked and the linker wishes the call site to throw away any prior linkage state (that is how it differs from `RelinkableCallSite.relink(GuardedInvocation, MethodHandle)`).

  ### Methods declared in class AbstractRelinkableCallSite

  `getDescriptor, initialize`

  ### Methods declared in class MutableCallSite

  `dynamicInvoker, getTarget, setTarget, syncAll`

  ### Methods declared in class CallSite

  `type`

  ### Methods declared in class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Constructor Details

  - ### SimpleRelinkableCallSite

    public SimpleRelinkableCallSite(CallSiteDescriptor descriptor)
    Creates a new call site with monomorphic inline caching strategy.
    Parameters:
      `descriptor` - the descriptor for this call site

- ## Method Details

  - ### relink

    public void relink(GuardedInvocation guardedInvocation, MethodHandle relinkAndInvoke)
    Description copied from interface: `RelinkableCallSite`
    This method will be called by the dynamic linker every time the call site is relinked (but see `RelinkableCallSite.resetAndRelink(GuardedInvocation, MethodHandle)` for an exception). It will be passed a `GuardedInvocation` that the call site should incorporate into its target method handle. When this method is called, the call site is allowed to keep other non-invalidated invocations around for implementation of polymorphic inline caches and compose them with this invocation to form its final target.
    Parameters:
      `guardedInvocation` - the guarded invocation that the call site should incorporate into its target method handle.
      `relinkAndInvoke` - a relink-and-invoke method handle. This is a method handle matching the method type of the call site that is supplied by the `DynamicLinker` as a callback. It should be used by this call site as the ultimate fallback when it can't invoke its target with the passed arguments. The fallback method is such that when it's invoked, it'll try to obtain an adequate target `GuardedInvocation` for the invocation, and subsequently invoke `RelinkableCallSite.relink(GuardedInvocation, MethodHandle)` or `RelinkableCallSite.resetAndRelink(GuardedInvocation, MethodHandle)`, and finally invoke the target.

  - ### resetAndRelink

    public void resetAndRelink(GuardedInvocation guardedInvocation, MethodHandle relinkAndInvoke)
    Description copied from interface: `RelinkableCallSite`
    This method will be called by the dynamic linker every time the call site is relinked and the linker wishes the call site to throw away any prior linkage state (that is how it differs from `RelinkableCallSite.relink(GuardedInvocation, MethodHandle)`). It will be passed a `GuardedInvocation` that the call site should use to build its new target method handle. When this method is called, the call site is discouraged from keeping any previous state, and is supposed to only link the current invocation.
    Parameters:
      `guardedInvocation` - the guarded invocation that the call site should use to build its target method handle.
      `relinkAndInvoke` - a relink-and-invoke method handle. This is a method handle matching the method type of the call site that is supplied by the `DynamicLinker` as a callback. It should be used by this call site as the ultimate fallback when it can't invoke its target with the passed arguments. The fallback method is such that when it's invoked, it'll try to obtain an adequate target `GuardedInvocation` for the invocation, and subsequently invoke `RelinkableCallSite.relink(GuardedInvocation, MethodHandle)` or `RelinkableCallSite.resetAndRelink(GuardedInvocation, MethodHandle)`, and finally invoke the target.