将CompletionStage与Java中的play框架操作相结合
我尝试在play框架中组合CompletionStages,然后返回类似ok()的结果。这是我的设置: AccountDao有两种方法:将CompletionStage与Java中的play框架操作相结合,java,database,playback,completable-future,completion-stage,Java,Database,Playback,Completable Future,Completion Stage,我尝试在play框架中组合CompletionStages,然后返回类似ok()的结果。这是我的设置: AccountDao有两种方法: public CompletionStage<Account> getUserByEmail(String email) { return supplyAsync(() -> ebeanServer.find(Account.class).setUseCache(true).where().eq(EMAIL, email).findO
public CompletionStage<Account> getUserByEmail(String email) {
return supplyAsync(() -> ebeanServer.find(Account.class).setUseCache(true).where().eq(EMAIL, email).findOne(), executionContext).thenApply(account -> {
return account;
});
}
public CompletionStage<Void> updateAccount(Account account) throws OptimisticLockException{
return runAsync(() -> {
ebeanServer.update(account);
}, executionContext);
}
在这种情况下,只更新帐户一次,并且只返回httpExecutionContext上的结果如果我正确理解了您的问题,您希望在
updateAccount(account)
方法调用之后访问(保存?)帐户
由于updateAccount
方法返回CompletionStage
,因此在此stage上调用theapplyasync
时,输入类型将仅为Void
,而不是Account
。但是使用以下代码,您仍然可以访问从getUserByEmail
返回的帐户,假设updateAccount
通过文本“updatevars in x”对帐户进行变异:
公共CompletionStage编辑帐户(){
返回帐户DAO
.getUserByEmail(电子邮件)
.Thencose(account->accountDao.updateAccount(account)
.ThenApplySync(无效输入->{
//在这里,您仍然可以通过“getUserByEmail”方法访问“account”
accountDao.saveAccount(account);
返回ok(“已保存账户”);
},httpExecutionContext.current());
}
好的,在Marimuthu Madasamy的支持下,我在这里找到了自己的awnser!谢谢。我试着解释一下。首先是代码:
public CompletionStage<Result> editAccount() {
Map<String, String[]> form_values = request().body().asFormUrlEncoded();
return accountDao.getUserByEmail(session().get("accountEmail")).thenApply(account -> {
System.out.println("Async get Account / "+Thread.currentThread());
account.setCompany(form_values.get("company")[0]);
return accountDao.updateAccount(account);
}).thenApplyAsync(account -> {
System.out.println("Async resutl / "+Thread.currentThread());
return ok("Account saved normal");
}, httpExecutionContext.current()).exceptionally(e ->{
System.out.println("Async exception / "+Thread.currentThread());
System.out.println(e.getLocalizedMessage());
return ok(e.getLocalizedMessage());
});
}
公共CompletionStage编辑帐户(){
映射表单_值=请求().body().asFormUrlEncoded();
返回accountDao.getUserByEmail(session().get(“accountEmail”))。然后应用(account->{
System.out.println(“异步获取帐户/”+Thread.currentThread());
account.setCompany(form_values.get(“company”)[0]);
返回accountDao.updateAccount(account);
}).然后应用同步(帐户->{
System.out.println(“异步resutl/”+Thread.currentThread());
返回ok(“正常保存的帐户”);
},httpExecutionContext.current())。异常情况下(e->{
System.out.println(“异步异常/”+Thread.currentThread());
System.out.println(e.getLocalizedMessage());
返回ok(例如getLocalizedMessage());
});
}
好的,首先我执行accountDao.getUserByEmail()正如您在我的awnser的顶部所看到的,这将返回CompletionStage,并在我的数据库执行上下文中执行。在接下来的应用程序中,我得到结果并执行下一个异步方法。我使用应用程序同步的应用实例,因此下一个调用也将在数据库执行上下文中执行,而不显式设置它untDao.updateAccount()我在httpExecutionContext上执行下一个阶段,以重播结果或异常退出!我真的希望这是清楚的,并对某些人有所帮助!我编辑了我的问题。也许你知道如何实现这一点?我在CompletionStage控制器中不使用httpExecutionContext。但它仍然有效。你能解释一下为什么吗?
public CompletionStage<Result> editAccount() {
Map<String, String[]> form_values = request().body().asFormUrlEncoded();
accountDao.getUserByEmail(session().get("accountEmail")).thenCompose(x -> accountDao.updateAccount(x).thenApplyAsync(account -> {
return ok("Going to save account edits");
}, httpExecutionContext.current()));
return CompletableFuture.completedFuture(ok("Fehler am Ende"));
}
public CompletionStage<Result> editAccount() {
Map<String, String[]> form_values = request().body().asFormUrlEncoded();
accountDao.getUserByEmail(session().get("accountEmail")).thenCompose(x -> {
//Update vars in x and then save to database
accountDao.updateAccount(x);
}.thenApplyAsync(account -> {
return ok("Going to save account edits");
}, httpExecutionContext.current()));
return CompletableFuture.completedFuture(ok("Fehler am Ende"));
}
return accountDao.getUserByEmail("mail").thenCompose(account -> {
account.setName("NewName");
accountDao.save(account);
} .thenApplyAsync(voidInput -> {
return ok("Account saved");
}, httpExecutionContext.current()));
public CompletionStage<Result> editAccount() {
return accountDao
.getUserByEmail(email)
.thenCompose(account -> accountDao.updateAccount(account)
.thenApplyAsync(voidInput -> {
// here you still have access to the `account` from `getUserByEmail` method
accountDao.saveAccount(account);
return ok("Account saved");
}, httpExecutionContext.current());
}
public CompletionStage<Result> editAccount() {
Map<String, String[]> form_values = request().body().asFormUrlEncoded();
return accountDao.getUserByEmail(session().get("accountEmail")).thenApply(account -> {
System.out.println("Async get Account / "+Thread.currentThread());
account.setCompany(form_values.get("company")[0]);
return accountDao.updateAccount(account);
}).thenApplyAsync(account -> {
System.out.println("Async resutl / "+Thread.currentThread());
return ok("Account saved normal");
}, httpExecutionContext.current()).exceptionally(e ->{
System.out.println("Async exception / "+Thread.currentThread());
System.out.println(e.getLocalizedMessage());
return ok(e.getLocalizedMessage());
});
}