Class AbstractRelinkableCallSite

java.lang.Object
java.lang.invoke.CallSite
java.lang.invoke.MutableCallSite
jdk.dynalink.support.AbstractRelinkableCallSite
All Implemented Interfaces:
RelinkableCallSite
Direct Known Subclasses:
ChainedCallSite, SimpleRelinkableCallSite
public abstract class AbstractRelinkableCallSite extends MutableCallSite implements RelinkableCallSite
A basic implementation of the RelinkableCallSite as a MutableCallSite. It carries a CallSiteDescriptor passed in the constructor and provides the correct implementation of the initialize(MethodHandle) method. Subclasses must provide RelinkableCallSite.relink(GuardedInvocation, MethodHandle) and RelinkableCallSite.resetAndRelink(GuardedInvocation, MethodHandle) methods.
Since:
9

  • Constructor Summary

    Constructors
    Modifier
    Constructor
    Description
    protected
    AbstractRelinkableCallSite(CallSiteDescriptor descriptor)
    Creates a new abstract relinkable call site.

  • Method Summary

    Modifier and Type
    Method
    Description
    CallSiteDescriptor
    getDescriptor()
    Returns the descriptor for this call site.
    void
    initialize(MethodHandle relinkAndInvoke)
    Invoked by dynamic linker to initialize the relinkable call site by setting a relink-and-invoke method handle.

    Methods declared in class MutableCallSite

    dynamicInvoker, getTarget, setTarget, syncAll
    Modifier and Type
    Method
    Description
    final MethodHandle
    dynamicInvoker()
    Produces a method handle equivalent to an invokedynamic instruction which has been linked to this call site.
    final MethodHandle
    getTarget()
    Returns the target method of the call site, which behaves like a normal field of the MutableCallSite.
    void
    setTarget(MethodHandle newTarget)
    Updates the target method of this call site, as a normal variable.
    static void
    syncAll(MutableCallSite[] sites)
    Performs a synchronization operation on each call site in the given array, forcing all other threads to throw away any cached values previously loaded from the target of any of the call sites.

    Methods declared in class CallSite

    type
    Modifier and Type
    Method
    Description
    MethodType
    type()
    Returns the type of this call site's target.

    Methods declared in class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    Modifier and Type
    Method
    Description
    protected Object
    clone()
    Creates and returns a copy of this object.
    boolean
    equals(Object obj)
    Indicates whether some other object is "equal to" this one.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    Finalization is deprecated and subject to removal in a future release.
    final Class<?>
    getClass()
    Returns the runtime class of this Object.
    int
    hashCode()
    Returns a hash code value for this object.
    final void
    notify()
    Wakes up a single thread that is waiting on this object's monitor.
    final void
    notifyAll()
    Wakes up all threads that are waiting on this object's monitor.
    String
    toString()
    Returns a string representation of the object.
    final void
    wait()
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
    final void
    wait(long timeoutMillis)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
    final void
    wait(long timeoutMillis, int nanos)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

    Methods declared in interface RelinkableCallSite

    relink, resetAndRelink
    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)).

  • Constructor Details

  • Method Details

    • getDescriptor

      public CallSiteDescriptor getDescriptor()
      Description copied from interface: RelinkableCallSite
      Returns the descriptor for this call site.
      Specified by:
      getDescriptor in interface RelinkableCallSite
      Returns:
      the descriptor for this call site.

    • initialize

      public void initialize(MethodHandle relinkAndInvoke)
      Description copied from interface: RelinkableCallSite
      Invoked by dynamic linker to initialize the relinkable call site by setting a relink-and-invoke method handle. The call site implementation is supposed to set this method handle as its target using CallSite.setTarget(MethodHandle). Relink-and-invoke is the initial method handle set by DynamicLinker.link(RelinkableCallSite) that will cause the call site to be relinked to an appropriate target on its first invocation based on its arguments, and that linked target will then be invoked (hence the name). This linking protocol effectively delays linking until the call site is invoked with actual arguments and thus ensures that linkers can make nuanced linking decisions based on those arguments and not just on the static method type of the call site.
      Specified by:
      initialize in interface RelinkableCallSite
      Parameters:
      relinkAndInvoke - a relink-and-invoke method handle supplied by Dynalink.