[英]Difference between Spring Async, Async with CompletableFuture and Java8 parallel stream
[英]Java 8 - How to track number of exceptions invoked within an async parallel stream using CompletableFuture
抱歉,標題令人困惑,我正在嘗試跟蹤異步執行的方法引發異常的次數,同時還將成功執行的結果檢索到類變量中。 不過,我認為我的實現很不合適,CompletableFuture 的列表在這里比列表的 CompletableFuture 更合適嗎?
public class testClass {
private List<Integer> resultNumbers;
public void testMethod() {
int exceptions = 0;
try {
methodWithFuture();
catch (InterruptedException | ExecutionException e) {
exceptions++;
}
System.out.println("Number of times the addNumber method threw an exception=" + exceptions);
}
public void methodWithFuture() throws InterruptedException, ExecutionException {
List<Integer> numbersList = Arrays.asList(new Integer[] { 1, 2, 3 })
CompletableFuture<List<Integer>> futuresList = CompletableFuture.supplyAsync(() ->
numbersList.parallelStream().map(number -> addNumber(number))).collect(Collectors.toList()),
new ForkJoinPool(3));
resultNumbers.addAll(futuresList.get());
}
}
因此,查看您的代碼,您最多只會收到 1 個異常。 對 addNumber 的每次調用都有一個更好的 CompletableFuture 調用。 然后檢查是否異常。
public void testMethod(){
int exceptions = 0;
List<Integer> numbersList = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13);
List<CompletableFuture<Integer>> cfList = new ArrayList<>();
for(int number : numbersList){
CompletableFuture<Integer> cf = methodWithFuture(number);
cfList.add(cf);
}
CompletableFuture<Void> allOfCF = CompletableFuture.allOf(cfList.toArray(new CompletableFuture[0]));
try {allOf.get();} catch (InterruptedException | ExecutionException ignored) {}
int sum = 0;
for(CompletableFuture<Integer> cf : cfList){
if(cf.isCompletedExceptionally()){
exceptions ++;
} else {
sum += cf.get();
}
}
System.out.println("Number of times the addNumber method threw an exception=" + exceptions);
System.out.println("SUM " + sum);
}
public CompletableFuture<Integer> methodWithFuture(int number) {
return CompletableFuture.supplyAsync(() -> addNumber(number));
}
這里我已經異步提交了對addNumber
每個調用,並在它們完成后使用allOf
等待加入它們
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