空指针异常

[ITRocker]

OkDownload Version

v1.0.3

Problem Describe

空指针异常应该是在多线程的情况下产生的，但目前不知道怎么修改。
不明白BlockInfo.getTotalLength 中为啥要做clone，直接遍历去长度不就可以了 。

Log

java.lang.NullPointerException: Attempt to invoke virtual method 'long com.liulishuo.okdownload.core.breakpoint.BlockInfo.d()' on a null object reference
at com.liulishuo.okdownload.core.breakpoint.BreakpointInfo.g(BreakpointInfo.java:143)
at com.liulishuo.okdownload.core.listener.assist.Listener1Assist$Listener1Model.onInfoValid(Listener1Assist.java:151)
at com.liulishuo.okdownload.core.listener.assist.Listener1Assist.a(Listener1Assist.java:62)
at com.liulishuo.okdownload.core.listener.DownloadListener1.downloadFromBeginning(DownloadListener1.java:77)
at com.liulishuo.okdownload.core.listener.DownloadListenerBunch.downloadFromBeginning(DownloadListenerBunch.java:66)
at com.liulishuo.okdownload.core.dispatcher.CallbackDispatcher$DefaultTransmitListener$4.run(CallbackDispatcher.java:248)
at android.os.Handler.handleCallback(Handler.java:836)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:232)
at android.app.ActivityThread.main(ActivityThread.java:6802)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1103)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:964)

[rantianhua]

用 Clone 是为了避免用锁做同步降低性能，不过因为 clone 本身也不是线程安全的，所以出现这个问题。