compose and combine CompletableFutures

compose_and_combine.java

CompletableFuture<Map<String, Object>> myObjectCompletableFuture =
    myCompletableFutureBigDecimal.thenCompose(bigDecimalValue ->
        myCompletableFutureInt
            .thenCombine(myCompletableFutureLong,
                ((integerValue, longValue) -> {
                  Map<String, Object> objectHashMap = new HashMap<>();
                  objectHashMap.put("IntegerValue", integerValue);
                  objectHashMap.put("LongValue", longValue);
                  objectHashMap.put("BigDecimalValue", bigDecimalValue);
                  return objectHashMap;
                })));