写Observable<T>
最有效的方法是什么?将项目放入文本文件中,其中为每次发射写入一行?我正在使用 try-with-resources
下面设置 CountDownLatch
,但由于阻塞,它绝对感觉像是一种反模式。中断和提前取消订阅也很有可能引发错误。
private void saveToCSV(String url) {
CountDownLatch latch = new CountDownLatch(1);
File outputFile = new File(url);
try(BufferedWriter writer = new BufferedWriter(new FileWriter(outputFile))) {
writer.write(ReportItem.getHeaders() + "\r\n");
reportItems.forDate(dt)
.map(ReportItem::toCSVLine).map(s -> s.concat("\r\n"))
.subscribe(Checked.a1(writer::write), Throwable::printStackTrace, latch::countDown);
latch.await();
} catch (Exception e) {
e.printStackTrace();
}
}
最佳答案
再三考虑之后,Observable.using()
或许不是这里的最佳候选者。我会简单地尝试这样的事情(用 finallyDo()
代替):
private void saveToCSV(String url) {
BufferedWriter writer = getBufferedWriter(url);
writer.write(ReportItem.getHeaders() + "\r\n");
reportItems.forDate(dt)
.map(ReportItem::toCSVLine).map(s -> s.concat("\r\n"))
.finallyDo(() -> close(writer))
.subscribe(Checked.a1(writer::write), Throwable::printStackTrace);
}
private void close(BufferedWriter writer) {
try {
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
private BufferedWriter getBufferedWriter(String url) {
try {
File outputFile = new File(url);
return new BufferedWriter(new FileWriter(outputFile));
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
关于java - 将 RxJava Emissions 写入文本文件的有效方法?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34426103/