Question

我有一个SWF TryCatch类结构，如：

new TryCatch() {
        @Override
        protected void doTry() throws Throwable {
            Promise<Boolean> ifHostsWereReserved = client.reserveHostsForOnboarding());
            Promise<Boolean> ifHostsReleaseCompleted = client.releaseExtraHostsAfterOnboarding();
        }

        @Override
        protected void doCatch(Throwable e) throws Throwable {
            updateAvailableHosts(ifHostsWereReserved,
            ifHostsReleaseCompleted);
        }
}

我无法访问doCatch（）块中的变量，因为变量是doTry（）方法的本地变量。另外，如果我在doTry（）方法之前声明它们并在doTry（）方法中更新它们的值，它们就不再等同于final，我收到了编译错误。

什么是处理这个问题的首选方法。

Answer 1

你可以声明这样的变量：

new TryCatch() {
        Promise<Boolean> ifHostsWereReserved;
        Promise<Boolean> ifHostsReleaseCompleted;

        @Override
        protected void doTry() throws Throwable {
            ifHostsWereReserved = client.reserveHostsForOnboarding());
            ifHostsReleaseCompleted = client.releaseExtraHostsAfterOnboarding();
        }

        @Override
        protected void doCatch(Throwable e) throws Throwable {
            updateAvailableHosts(ifHostsWereReserved,
            ifHostsReleaseCompleted);
        }
}

Answer 2

eazimmerman评论是正确的。如果需要在TryCatch之外引用变量，可以像这样使用Settable：

final Settable<Boolean> ifHostsWereReserved = new Settable<>();
final Settable<Boolean> ifHostsReleaseCompleted = new Settable<>();

new TryCatch() {

    @Override
    protected void doTry() throws Throwable {
        ifHostsWereReserved.chain(client.reserveHostsForOnboarding()));
        ifHostsReleaseCompleted.chain(client.releaseExtraHostsAfterOnboarding());
    }

    @Override
    protected void doCatch(Throwable e) throws Throwable {
        updateAvailableHosts(ifHostsWereReserved,
        ifHostsReleaseCompleted);
    }
};

useTheseVariables(ifHostsWereReserved, ifHostsReleaseCompleted);

使用在SWF TryCatch中的doCatch（）方法中的doTry（）方法中定义的变量

2 个答案: