Class SerializedLambda

java.lang.Object
java.lang.invoke.SerializedLambda
All Implemented Interfaces:
Serializable
public final classSerializedLambdaextendsObjectimplementsSerializable
Serialized form of a lambda expression. The properties of this classrepresent the information that is present at the lambda factory site, includingstatic metafactory arguments such as the identity of the primary functionalinterface method and the identity of the implementation method, as well asdynamic metafactory arguments such as values captured from the lexical scopeat the time of lambda capture.

Implementors of serializable lambdas, such as compilers or languageruntime libraries, are expected to ensure that instances deserialize properly.One means to do so is to ensure that thewriteReplace method returnsan instance ofSerializedLambda, rather than allowing defaultserialization to proceed.

SerializedLambda has areadResolve method that looks fora (possibly private) static method called$deserializeLambda$(SerializedLambda) in the capturing class, invokesthat with itself as the first argument, and returns the result. Lambda classesimplementing$deserializeLambda$ are responsible for validatingthat the properties of theSerializedLambda are consistent with alambda actually captured by that class.

The identity of a function object produced by deserializing the serializedform is unpredictable, and therefore identity-sensitive operations (such asreference equality, object locking, andSystem.identityHashCode()) mayproduce different results in different implementations, or even upondifferent deserializations in the same implementation.

Since:
1.8
See Also:

  • Constructor Details

    • SerializedLambda

      public SerializedLambda(Class<?> capturingClass,String functionalInterfaceClass,String functionalInterfaceMethodName,String functionalInterfaceMethodSignature, int implMethodKind,String implClass,String implMethodName,String implMethodSignature,String instantiatedMethodType,Object[] capturedArgs)
      Create aSerializedLambda from the low-level information presentat the lambda factory site.
      Parameters:
      capturingClass - The class in which the lambda expression appears
      functionalInterfaceClass - Name, in slash-delimited form, of static type of the returned lambda object
      functionalInterfaceMethodName - Name of the functional interface method for the present at the lambda factory site
      functionalInterfaceMethodSignature - Signature of the functional interface method present at the lambda factory site
      implMethodKind - Method handle kind for the implementation method
      implClass - Name, in slash-delimited form, for the class holding the implementation method
      implMethodName - Name of the implementation method
      implMethodSignature - Signature of the implementation method
      instantiatedMethodType - The signature of the primary functional interface method after type variables are substituted with their instantiation from the capture site
      capturedArgs - The dynamic arguments to the lambda factory site, which represent variables captured by the lambda

  • Method Details

    • getCapturingClass

      public String getCapturingClass()
      Get the name of the class that captured this lambda.
      Returns:
      the name of the class that captured this lambda

    • getFunctionalInterfaceClass

      public String getFunctionalInterfaceClass()
      Get the name of the invoked type to which thislambda has been converted
      Returns:
      the name of the functional interface class to whichthis lambda has been converted

    • getFunctionalInterfaceMethodName

      public String getFunctionalInterfaceMethodName()
      Get the name of the primary method for the functional interfaceto which this lambda has been converted.
      Returns:
      the name of the primary methods of the functional interface

    • getFunctionalInterfaceMethodSignature

      public String getFunctionalInterfaceMethodSignature()
      Get the signature of the primary method for the functionalinterface to which this lambda has been converted.
      Returns:
      the signature of the primary method of the functionalinterface

    • getImplClass

      public String getImplClass()
      Get the name of the class containing the implementationmethod.
      Returns:
      the name of the class containing the implementationmethod

    • getImplMethodName

      public String getImplMethodName()
      Get the name of the implementation method.
      Returns:
      the name of the implementation method

    • getImplMethodSignature

      public String getImplMethodSignature()
      Get the signature of the implementation method.
      Returns:
      the signature of the implementation method

    • getImplMethodKind

      public int getImplMethodKind()
      Get the method handle kind (seeMethodHandleInfo) ofthe implementation method.
      Returns:
      the method handle kind of the implementation method

    • getInstantiatedMethodType

      public final String getInstantiatedMethodType()
      Get the signature of the primary functional interface methodafter type variables are substituted with their instantiationfrom the capture site.
      Returns:
      the signature of the primary functional interface methodafter type variable processing

    • getCapturedArgCount

      public int getCapturedArgCount()
      Get the count of dynamic arguments to the lambda capture site.
      Returns:
      the count of dynamic arguments to the lambda capture site

    • getCapturedArg

      public Object getCapturedArg(int i)
      Get a dynamic argument to the lambda capture site.
      Parameters:
      i - the argument to capture
      Returns:
      a dynamic argument to the lambda capture site