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import java.util.*;
import java.util.stream.*;
import java.util.function.*;
public class Main
{
public static void main(String[] args) {
new Main().savePageInSeparatedTransaction(
p -> new Page<A>() {
@Override public List<A> getContent() {
return Arrays.asList(new A(1), new A(2), new A(3));
}
},
null, // a -> new B(a.a + 5), // converter
Main::saverOk, // saver
new Pageable() {} // pageable //PageRequest.of(0, 20_000, Sort.Direction.ASC, "id.lim")
);
}
static void saverOk(List<B> data) {
System.out.println(data);
}
static void saverClassCast(List<B> data) {
for (B b : data) {
System.out.println(b);
}
}
protected <T, R> Page<T> savePageInSeparatedTransaction(
Function<Pageable, Page<T>> sourceSupplier,
Function<T, R> converter,
Consumer<List<R>> saver,
Pageable pageRequest
) {
return getTransactionTemplate().execute(s -> {
Page<T> sourcePage = sourceSupplier.apply(pageRequest);
List<R> converted = converter == null
? (List<R>) sourcePage.getContent()
: sourcePage.stream()
.map(converter)
.collect(Collectors.toList());
saver.accept(converted);
return sourcePage;
});
}
/*
protected <T> Page<T> savePageInSeparatedTransaction(
Function<Pageable, Page<T>> sourceSupplier,
Consumer<List<T>> saver,
Pageable pageRequest
) {
return getTransactionTemplate().execute(s -> {
Page<T> sourcePage = sourceSupplier.apply(pageRequest);
saver.accept(sourcePage.getContent());
return sourcePage;
});
}
*/
private TransactionTemplate getTransactionTemplate() {
return new TransactionTemplate();
}
} // end of Main
class A {
int a;
public A(int a) {this.a = a;}
@Override public String toString() { return "A:a=" + a;}
}
class B {
int b;
B(int x) {this.b = x;}
B(A a) {this.b = a.a * 2;}
@Override public String toString() { return "B:b=" + b;}
}
class TransactionTemplate {
public <T> T execute(TransactionCallback<T> action) {
return action.doInTransaction(new TransactionStatus(){});
}
}
interface TransactionCallback<T> {
T doInTransaction(TransactionStatus status);
}
interface TransactionStatus {
}
interface Pageable {
}
interface Page<T> {
default Stream<T> stream() {
return getContent().stream();
}
List<T> getContent();
}
Compiling Program...
Standard Input:
Interactive Console
Text
Program is not being debugged. Click "Debug" button to start program in debug mode.
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