本文整理汇总了Java中org.apache.flink.streaming.api.checkpoint.CheckpointedFunction类的典型用法代码示例。如果您正苦于以下问题：Java CheckpointedFunction类的具体用法？Java CheckpointedFunction怎么用？Java CheckpointedFunction使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
CheckpointedFunction类属于org.apache.flink.streaming.api.checkpoint包，在下文中一共展示了CheckpointedFunction类的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: checkUdfCheckpointingPreconditions
import org.apache.flink.streaming.api.checkpoint.CheckpointedFunction; //导入依赖的package包/类
private void checkUdfCheckpointingPreconditions() {
if (userFunction instanceof CheckpointedFunction
&& userFunction instanceof ListCheckpointed) {
throw new IllegalStateException("User functions are not allowed to implement " +
"CheckpointedFunction AND ListCheckpointed.");
}
}
示例2: trySnapshotFunctionState
import org.apache.flink.streaming.api.checkpoint.CheckpointedFunction; //导入依赖的package包/类
private static boolean trySnapshotFunctionState(
StateSnapshotContext context,
OperatorStateBackend backend,
Function userFunction) throws Exception {
if (userFunction instanceof CheckpointedFunction) {
((CheckpointedFunction) userFunction).snapshotState(context);
return true;
}
if (userFunction instanceof ListCheckpointed) {
@SuppressWarnings("unchecked")
List<Serializable> partitionableState = ((ListCheckpointed<Serializable>) userFunction).
snapshotState(context.getCheckpointId(), context.getCheckpointTimestamp());
ListState<Serializable> listState = backend.
getSerializableListState(DefaultOperatorStateBackend.DEFAULT_OPERATOR_STATE_NAME);
listState.clear();
if (null != partitionableState) {
try {
for (Serializable statePartition : partitionableState) {
listState.add(statePartition);
}
} catch (Exception e) {
listState.clear();
throw new Exception("Could not write partitionable state to operator " +
"state backend.", e);
}
}
return true;
}
return false;
}
示例3: tryRestoreFunction
import org.apache.flink.streaming.api.checkpoint.CheckpointedFunction; //导入依赖的package包/类
private static boolean tryRestoreFunction(
StateInitializationContext context,
Function userFunction) throws Exception {
if (userFunction instanceof CheckpointedFunction) {
((CheckpointedFunction) userFunction).initializeState(context);
return true;
}
if (context.isRestored() && userFunction instanceof ListCheckpointed) {
@SuppressWarnings("unchecked")
ListCheckpointed<Serializable> listCheckpointedFun = (ListCheckpointed<Serializable>) userFunction;
ListState<Serializable> listState = context.getOperatorStateStore().
getSerializableListState(DefaultOperatorStateBackend.DEFAULT_OPERATOR_STATE_NAME);
List<Serializable> list = new ArrayList<>();
for (Serializable serializable : listState.get()) {
list.add(serializable);
}
try {
listCheckpointedFun.restoreState(list);
} catch (Exception e) {
throw new Exception("Failed to restore state to function: " + e.getMessage(), e);
}
return true;
}
return false;
}