Java 8 组合多重可完成期货
我有以下组成部分:Java 8 组合多重可完成期货,java-8,completable-future,Java 8,Completable Future,我有以下组成部分: private JobInfo aggregateJobInfo() { final JobsResult jobsResult = restClient().getJobs(); final List<String> jobIds = extractJobIds(jobsResult); //fetch details, exceptions and config for each job final List<JobDe
private JobInfo aggregateJobInfo() {
final JobsResult jobsResult = restClient().getJobs();
final List<String> jobIds = extractJobIds(jobsResult);
//fetch details, exceptions and config for each job
final List<JobDetails> jobDetails = jobIds.stream().map(jobId -> {
final JobDetailResult jobDetailResult = restClient().getJobDetails(jobId);
final JobExceptionsResult jobExceptionsResult = restClient().getJobExceptions(jobId);
final JobConfigResult jobConfigResult = restClient().getJobConfig(jobId);
return new JobDetails(jobDetailResult, jobExceptionsResult, jobConfigResult);
}).collect(Collectors.toList());
return new JobInfo(jobsResult, jobDetails);
}
private static List<String> extractJobIds(final JobsResult jobsResult) {
final ArrayList<String> jobIds = new ArrayList<>();
jobIds.addAll(jobsResult.getRunning());
jobIds.addAll(jobsResult.getFinished());
jobIds.addAll(jobsResult.getCanceled());
jobIds.addAll(jobsResult.getFailed());
return jobIds;
}
private JobInfo aggregateJobInfo(){
final JobsResult JobsResult=restClient().getJobs();
最终列表jobIds=提取jobIds(jobsResult);
//获取每个作业的详细信息、异常和配置
最终列表jobDetails=jobIds.stream().map(jobId->{
最终JobDetailResult JobDetailResult=restClient().getJobDetails(jobId);
最终JobExceptionsResult JobExceptionsResult=restClient().getJobExceptions(jobId);
最终JobConfigResult JobConfigResult=restClient().getJobConfig(jobId);
返回新的JobDetails(jobDetailResult、jobExceptionsResult、jobConfigResult);
}).collect(Collectors.toList());
返回新的JobInfo(jobsResult、jobDetails);
}
私有静态列表extractJobIds(最终JobsResult JobsResult){
final ArrayList jobIds=new ArrayList();
addAll(jobsResult.getRunning());
jobIds.addAll(jobsResult.getFinished());
jobIds.addAll(jobsResult.getcancelled());
jobIds.addAll(jobsResult.getFailed());
返回工单;
}
它只是调用一些端点并聚合一些数据。现在我正试图通过使用CompletableFutures来实现非阻塞,这是我以前没有真正使用过的
private CompletableFuture<JobInfo> aggregateJobInfo() {
final CompletableFuture<JobsResult> jobsResultFuture = restClient().getJobs();
final CompletableFuture<List<String>> jobIdsFuture = jobsResultFuture.thenApply(JobInfoCollector::extractJobIds);
//fetch details, exceptions and config for each job
final CompletableFuture<List<CompletableFuture<JobDetails>>> jobDetailsFuture = jobIdsFuture.thenApply(jobIds -> {
return jobIds.stream().map(jobId -> {
final CompletableFuture<JobDetailResult> jobDetailsResultFuture = restClient().getJobDetails(jobId);
final CompletableFuture<JobExceptionsResult> jobExceptionsFuture = restClient().getJobExceptions(jobId);
final CompletableFuture<JobConfigResult> jobConfigFuture = restClient().getJobConfig(jobId);
return jobDetailsResultFuture.thenCompose(jobDetailResult -> {
return jobExceptionsFuture.thenCombine(jobConfigFuture, (jobExceptionsResult, jobConfigResult) -> {
return new JobDetails(jobDetailResult, jobExceptionsResult, jobConfigResult);
});
});
}).collect(Collectors.toList());
});
return null;
private CompletableFuture aggregateJobInfo(){
最终CompletableFuture作业ResultFuture=restClient().getJobs();
final CompletableFuture-jobIdsFuture=jobsResultFuture.thenApply(JobInfoCollector::extractJobIds);
//获取每个作业的详细信息、异常和配置
final Completable Future JobDetails Future=jobIdsFuture。然后应用(jobIds->{
返回jobIds.stream().map(jobId->{
最终CompletableFuture jobDetailsResultFuture=restClient().getJobDetails(jobId);
最终CompletableFuture jobExceptionsFuture=restClient().getJobExceptions(jobId);
最终CompletableFuture jobConfigFuture=restClient().getJobConfig(jobId);
返回jobDetailsResultFuture.thenCompose(JobDetailsResult->{
返回jobExceptionsFuture。然后组合(jobConfigFuture,(jobExceptionsResult,jobConfigResult)->{
返回新的JobDetails(jobDetailResult、jobExceptionsResult、jobConfigResult);
});
});
}).collect(Collectors.toList());
});
返回null;
我的问题是,当JobInfo为“new JobInfo(jobsResult,jobDetails)”时,如何在此处创建CompletableFuture
正如我所说,我对这一点还不熟悉,也许我的方法不好,有更好的解决方案吗
任何想法都很感激,谢谢
第一个工作版本:
private CompletableFuture<JobInfo> aggregateJobInfo() {
final CompletableFuture<JobsResult> jobsResultFuture = restClient().getJobs();
final CompletableFuture<List<String>> jobIdsFuture = jobsResultFuture.thenApply(JobInfoCollector::extractJobIds);
final CompletableFuture<List<CompletableFuture<JobDetails>>> jobDetailsFutureListFuture =
jobIdsFuture.thenApply(jobIds -> jobIds.stream().map(jobId -> {
final CompletableFuture<JobDetailResult> jobDetailsResultFuture = restClient().getJobDetails(jobId);
final CompletableFuture<JobExceptionsResult> jobExceptionsFuture = restClient().getJobExceptions(jobId);
final CompletableFuture<JobConfigResult> jobConfigFuture = restClient().getJobConfig(jobId);
return jobDetailsResultFuture.thenCompose(jobDetailResult ->
jobExceptionsFuture.thenCombine(jobConfigFuture, (jobExceptionsResult, jobConfigResult) ->
new JobDetails(jobDetailResult, jobExceptionsResult, jobConfigResult)));
}).collect(Collectors.toList()));
return jobDetailsFutureListFuture.thenCompose(jobDetailsFutures ->
CompletableFuture.allOf(jobDetailsFutures.toArray(
new CompletableFuture[jobDetailsFutures.size()])).thenApply(aVoid ->
jobDetailsFutures.stream()
.map(CompletableFuture::join)
.collect(Collectors.toList())))
.thenApply(jobDetails -> jobsResultFuture.thenApply(jobsResult ->
new JobInfo(jobsResult, jobDetails)))
.join();
}
private CompletableFuture aggregateJobInfo(){
最终CompletableFuture作业ResultFuture=restClient().getJobs();
final CompletableFuture-jobIdsFuture=jobsResultFuture.thenApply(JobInfoCollector::extractJobIds);
最终完成的未来工作详细信息未来列表未来=
然后应用(jobIds->jobIds.stream().map(jobId->{
最终CompletableFuture jobDetailsResultFuture=restClient().getJobDetails(jobId);
最终CompletableFuture jobExceptionsFuture=restClient().getJobExceptions(jobId);
最终CompletableFuture jobConfigFuture=restClient().getJobConfig(jobId);
返回jobDetailsResultFuture.thenCompose(JobDetailsResult->
jobExceptionsFuture.thenCombine(jobConfigFuture,(jobExceptionsResult,jobConfigResult)->
新的JobDetails(jobDetailResult、jobExceptionsResult、jobConfigResult));
}).collect(Collectors.toList());
返回jobDetailsFutureListFuture。然后组合(jobDetailsFutures->
CompletableFuture.allOf(jobDetailsFutures.toArray(
新建CompletableFuture[jobDetailsFutures.size()])。然后应用(避免->
jobDetailsFutures.stream()
.map(CompletableFuture::join)
.collect(收集器.toList()))
.然后应用(作业详细信息->作业结果未来)。然后应用(作业结果->
新作业信息(作业结果、作业详细信息)))
.join();
}
您有:
CompletableFuture作业结果future
completable未来工作详细信息未来
JobInfo(作业结果a,列表b)
CompletableFuture
附加观察:jobstreatsfourture
只有在jobsResultFuture
完成时才能完成
因此,您可以实现以下功能:
List
->Void
通过allOf
在中创建
无效
+列表
(捕获变量)->列表
通过然后应用
List
+CompletableFuture
(捕获变量)->JobInfo
通过然后应用
get()
打开未来,因为由于其祖先未来在该点的依赖关系,未来保证在该点完成
使用
然后结合和流缩减的其他方法是可能的,但更详细,创建更多的中间未来。您粘贴的大多数代码似乎与问题不相关。您能否将其缩减到您需要的最小示例?问题是如何“映射”上面的未来数据是如此完整的未来被返回。抱歉,我不明白它。'waitAll'和Void是什么意思?意思是。它返回一个CompletableFuture
,因此获取数据的下一步将无法理解。尝试了jobDetailsListFuture。然后编写(jobDetailsFutures->{返回CompletableFuture.allOf(jobDetailsFutures.toArray(新的CompletableFuture[jobDetailsFutures.size()])。然后应用(避免->{???