Implementors of serializable lambdas, such as compilers or language + * runtime libraries, are expected to ensure that instances deserialize properly. + * One means to do so is to ensure that the {@code writeReplace} method returns + * an instance of {@code SerializedLambda}, rather than allowing default + * serialization to proceed. + * + *
{@code SerializedLambda} has a {@code readResolve} method that looks for
+ * a (possibly private) static method called
+ * {@code $deserializeLambda$(SerializedLambda)} in the capturing class, invokes
+ * that with itself as the first argument, and returns the result. Lambda classes
+ * implementing {@code $deserializeLambda$} are responsible for validating
+ * that the properties of the {@code SerializedLambda} are consistent with a
+ * lambda actually captured by that class.
+ *
+ * @see LambdaMetafactory
+ */
+public final class SerializedLambda implements Serializable {
+ private static final long serialVersionUID = 8025925345765570181L;
+ private final Class capturingClass;
+ private final String functionalInterfaceClass;
+ private final String functionalInterfaceMethodName;
+ private final String functionalInterfaceMethodSignature;
+ private final String implClass;
+ private final String implMethodName;
+ private final String implMethodSignature;
+ private final int implMethodKind;
+ private final String instantiatedMethodType;
+ private final Object[] capturedArgs;
+
+ /**
+ * Create a {@code SerializedLambda} from the low-level information present
+ * at the lambda factory site.
+ *
+ * @param capturingClass The class in which the lambda expression appears
+ * @param functionalInterfaceClass Name, in slash-delimited form, of static
+ * type of the returned lambda object
+ * @param functionalInterfaceMethodName Name of the functional interface
+ * method for the present at the
+ * lambda factory site
+ * @param functionalInterfaceMethodSignature Signature of the functional
+ * interface method present at
+ * the lambda factory site
+ * @param implMethodKind Method handle kind for the implementation method
+ * @param implClass Name, in slash-delimited form, for the class holding
+ * the implementation method
+ * @param implMethodName Name of the implementation method
+ * @param implMethodSignature Signature of the implementation method
+ * @param instantiatedMethodType The signature of the primary functional
+ * interface method after type variables
+ * are substituted with their instantiation
+ * from the capture site
+ * @param capturedArgs The dynamic arguments to the lambda factory site,
+ * which represent variables captured by
+ * the lambda
+ */
+ public SerializedLambda(Class capturingClass,
+ String functionalInterfaceClass,
+ String functionalInterfaceMethodName,
+ String functionalInterfaceMethodSignature,
+ int implMethodKind,
+ String implClass,
+ String implMethodName,
+ String implMethodSignature,
+ String instantiatedMethodType,
+ Object[] capturedArgs) {
+ this.capturingClass = capturingClass;
+ this.functionalInterfaceClass = functionalInterfaceClass;
+ this.functionalInterfaceMethodName = functionalInterfaceMethodName;
+ this.functionalInterfaceMethodSignature = functionalInterfaceMethodSignature;
+ this.implMethodKind = implMethodKind;
+ this.implClass = implClass;
+ this.implMethodName = implMethodName;
+ this.implMethodSignature = implMethodSignature;
+ this.instantiatedMethodType = instantiatedMethodType;
+ this.capturedArgs = Objects.requireNonNull(capturedArgs).clone();
+ }
+
+ /**
+ * Get the name of the class that captured this lambda.
+ * @return the name of the class that captured this lambda
+ */
+ public String getCapturingClass() {
+ return capturingClass.getName().replace('.', '/');
+ }
+
+ /**
+ * Get the name of the invoked type to which this
+ * lambda has been converted
+ * @return the name of the functional interface class to which
+ * this lambda has been converted
+ */
+ public String getFunctionalInterfaceClass() {
+ return functionalInterfaceClass;
+ }
+
+ /**
+ * Get the name of the primary method for the functional interface
+ * to which this lambda has been converted.
+ * @return the name of the primary methods of the functional interface
+ */
+ public String getFunctionalInterfaceMethodName() {
+ return functionalInterfaceMethodName;
+ }
+
+ /**
+ * Get the signature of the primary method for the functional
+ * interface to which this lambda has been converted.
+ * @return the signature of the primary method of the functional
+ * interface
+ */
+ public String getFunctionalInterfaceMethodSignature() {
+ return functionalInterfaceMethodSignature;
+ }
+
+ /**
+ * Get the name of the class containing the implementation
+ * method.
+ * @return the name of the class containing the implementation
+ * method
+ */
+ public String getImplClass() {
+ return implClass;
+ }
+
+ /**
+ * Get the name of the implementation method.
+ * @return the name of the implementation method
+ */
+ public String getImplMethodName() {
+ return implMethodName;
+ }
+
+ /**
+ * Get the signature of the implementation method.
+ * @return the signature of the implementation method
+ */
+ public String getImplMethodSignature() {
+ return implMethodSignature;
+ }
+
+ /**
+ * Get the method handle kind (see {@link MethodHandleInfo}) of
+ * the implementation method.
+ * @return the method handle kind of the implementation method
+ */
+ public int getImplMethodKind() {
+ return implMethodKind;
+ }
+
+ /**
+ * Get the signature of the primary functional interface method
+ * after type variables are substituted with their instantiation
+ * from the capture site.
+ * @return the signature of the primary functional interface method
+ * after type variable processing
+ */
+ public final String getInstantiatedMethodType() {
+ return instantiatedMethodType;
+ }
+
+ /**
+ * Get the count of dynamic arguments to the lambda capture site.
+ * @return the count of dynamic arguments to the lambda capture site
+ */
+ public int getCapturedArgCount() {
+ return capturedArgs.length;
+ }
+
+ /**
+ * Get a dynamic argument to the lambda capture site.
+ * @param i the argument to capture
+ * @return a dynamic argument to the lambda capture site
+ */
+ public Object getCapturedArg(int i) {
+ return capturedArgs[i];
+ }
+
+ private Object readResolve() throws ReflectiveOperationException {
+ try {
+ Method deserialize = AccessController.doPrivileged(new PrivilegedExceptionAction