class:VolatileCallSite [NONE]

```
public class VolatileCallSite
extends CallSite
```
A VolatileCallSite is a CallSite whose target acts like a volatile variable. An invokedynamic instruction linked to a VolatileCallSite sees updates to its call site target immediately, even if the update occurs in another thread. There may be a performance penalty for such tight coupling between threads.
Unlike MutableCallSite, there is no syncAll operation on volatile call sites, since every write to a volatile variable is implicitly synchronized with reader threads.

In other respects, a VolatileCallSite is interchangeable with MutableCallSite.

Since:

1.7

See Also:

MutableCallSite

constructor:<init>(java.lang.invoke.MethodType) [NONE]

VolatileCallSite
```
public VolatileCallSite(MethodType type)
```
Creates a call site with a volatile binding to its target. The initial target is set to a method handle of the given type which will throw an IllegalStateException if called.

Parameters:

type - the method type that this call site will have

Throws:

NullPointerException - if the proposed type is null

constructor:<init>(java.lang.invoke.MethodHandle) [NONE]

VolatileCallSite
```
public VolatileCallSite(MethodHandle target)
```
Creates a call site with a volatile binding to its target. The target is set to the given value.

Parameters:

target - the method handle that will be the initial target of the call site

Throws:

NullPointerException - if the proposed target is null

method:getTarget() [NONE]

getTarget
```
public final MethodHandle getTarget()
```
Returns the target method of the call site, which behaves like a volatile field of the VolatileCallSite.
The interactions of getTarget with memory are the same as of a read from a volatile field.

In particular, the current thread is required to issue a fresh read of the target from memory, and must not fail to see a recent update to the target by another thread.

Specified by:

getTarget in class CallSite

Returns:

the linkage state of this call site, a method handle which can change over time

See Also:

setTarget(java.lang.invoke.MethodHandle)

method:setTarget(java.lang.invoke.MethodHandle) [NONE]

setTarget
```
public void setTarget(MethodHandle newTarget)
```
Updates the target method of this call site, as a volatile variable. The type of the new target must agree with the type of the old target.
The interactions with memory are the same as of a write to a volatile field. In particular, any threads is guaranteed to see the updated target the next time it calls getTarget.

Specified by:

setTarget in class CallSite

Parameters:

newTarget - the new target

Throws:

NullPointerException - if the proposed new target is null

WrongMethodTypeException - if the proposed new target has a method type that differs from the previous target

See Also:

getTarget()

method:dynamicInvoker() [NONE]

dynamicInvoker

public final MethodHandle dynamicInvoker()

Produces a method handle equivalent to an invokedynamic instruction which has been linked to this call site.

This method is equivalent to the following code:


 MethodHandle getTarget, invoker, result;
 getTarget = MethodHandles.publicLookup().bind(this, "getTarget", MethodType.methodType(MethodHandle.class));
 invoker = MethodHandles.exactInvoker(this.type());
 result = MethodHandles.foldArguments(invoker, getTarget)

Specified by:: dynamicInvoker in class CallSite
Returns:: a method handle which always invokes this call site's current target