rxjava的observable订阅时如何实现oncomplete取消订阅
使用rxjava 2.x时，要在oncomplete被调用时取消订阅，可以使用completablefuture.complete向调用方发送完成信号。
示例：
flowable由持久层方法返回，以下是调用方中的代码：
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...
private volatile completablefuture<string> future = new completablefuture<>();
private atomicinteger count = new atomicinteger(0);
@override
public disposable flush(information information, flowable<table> table) throws schemaexportexception {
logger.info("start flowable flush");
disposable export_flush_complete = table.subscribe(tableins -> {
system.out.println(printasciitable(tableins));
system.out.println(printasciicolumns(tableins.getcolumns()));
system.out.println("\r\n");
count.addandget(1);
}, throwable -> {
logger.debug("export break, reason: " + throwable.getmessage());
future.cancel(true);
throw new schemaexportexception(throwable);
}, new action() {
@override
public void run() throws exception {
logger.debug("export complete, affect size:" + count.get());
future.complete("ok");
}
});
return export_flush_complete;
}
...调用方的代码：
...
long startStamp = System.currentTimeMillis();
// Flowable
Flowable<Table> tableFlowable = result.getAll(dbName.get(), strategy).flatMap(new Function<Table, Publisher<Table>>() {
@Override
public Publisher<Table> apply(@NonNull Table table) throws Exception {
return result.getTableColumn(table).flatMap(new Function<List<Column>, SingleSource<Table>>() {
@Override
public SingleSource<Table> apply(@NonNull List<Column> columns) throws Exception {
return Single.just(table.fillColumn(columns));
}
}).flatMapPublisher(new Function<Table, Publisher<? extends Table>>() {
@Override
public Publisher<? extends Table> apply(@NonNull Table table) throws Exception {
return Flowable.just(table);
}
});
}
});
Disposable disposable = null;
try {
disposable = out.flush(info, tableFlowable);
CompletableFuture<String> future = out.getFuture();
while (!future.isDone()) {
logger.info("[ERE-Flowable]未完成,线程休眠1秒");
Thread.currentThread().sleep(1000, 0);
}
String result = future.get();
logger.info("[ERE-Flowable]完成, 结果:" + result);
if (result.equals("OK")) {
long finishStamp = System.currentTimeMillis();
clearHander(disposable, "[ERE-Flowable]RxJava disposed because complete, WithTime: " + (finishStamp - startStamp));
}
} catch (Exception e) {
clearHander(disposable, "[ERE-Flowable]RxJava disposed has Exception: " + e.getMessage());
}
... 
