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realtime-operation's Issues

线程安全问题

当android端频繁的点击下载，删除时，出现空指针异常。
产生的原因：在遍历linkedList时，另一个线程在修改集合。
错误信息如下：
FATAL EXCEPTION: Thread-307
java.lang.NullPointerException
09-17 10:28:22.121: E/AndroidRuntime(5284): at com.goodow.realtime.Document.scheduleEvent(Document.java:271)
09-17 10:28:22.121: E/AndroidRuntime(5284): at com.goodow.realtime.CollaborativeObject.fireEvent(CollaborativeObject.java:89)
09-17 10:28:22.121: E/AndroidRuntime(5284): at com.goodow.realtime.CollaborativeMap.putAndFireEvent(CollaborativeMap.java:342)
09-17 10:28:22.121: E/AndroidRuntime(5284): at com.goodow.realtime.CollaborativeMap.access$100(CollaborativeMap.java:54)
09-17 10:28:22.121: E/AndroidRuntime(5284): at com.goodow.realtime.CollaborativeMap$1.set(CollaborativeMap.java:278)
09-17 10:28:22.121: E/AndroidRuntime(5284): at com.goodow.realtime.CollaborativeMap$1.set(CollaborativeMap.java:270)
09-17 10:28:22.121: E/AndroidRuntime(5284): at com.goodow.realtime.operation.map.AbstractMapOperation.apply(AbstractMapOperation.java:36)
09-17 10:28:22.121: E/AndroidRuntime(5284): at com.goodow.realtime.operation.map.AbstractMapOperation.apply(AbstractMapOperation.java:18)
09-17 10:28:22.121: E/AndroidRuntime(5284): at com.goodow.realtime.CollaborativeMap.consume(CollaborativeMap.java:270)
09-17 10:28:22.121: E/AndroidRuntime(5284): at com.goodow.realtime.DocumentBridge.applyLocally(DocumentBridge.java:240)
09-17 10:28:22.121: E/AndroidRuntime(5284): at com.goodow.realtime.DocumentBridge.consumeAndSubmit(DocumentBridge.java:171)
09-17 10:28:22.121: E/AndroidRuntime(5284): at com.goodow.realtime.CollaborativeObject.consumeAndSubmit(CollaborativeObject.java:85)
09-17 10:28:22.121: E/AndroidRuntime(5284): at com.goodow.realtime.CollaborativeMap.set(CollaborativeMap.java:239)
09-17 10:28:22.121: E/AndroidRuntime(5284): at com.goodow.drive.android.toolutils.OfflineFileObserver$1.run(OfflineFileObserver.java:144)

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