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[FLINK-39061][example] Roll back StateMachineExample to v1 State API #27936

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[FLINK-39061][example] Roll back StateMachineExample to v1 State API #27936

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50 changes: 21 additions & 29 deletions ...g/src/main/java/org/apache/flink/streaming/examples/statemachine/StateMachineExample.java
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Original file line number Diff line number Diff line change
Expand Up @@ -22,8 +22,8 @@
import org.apache.flink.api.common.functions.OpenContext;
import org.apache.flink.api.common.functions.RichFlatMapFunction;
import org.apache.flink.api.common.serialization.SimpleStringEncoder;
import org.apache.flink.api.common.state.v2.ValueState;
import org.apache.flink.api.common.state.v2.ValueStateDescriptor;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.connector.source.util.ratelimit.RateLimiterStrategy;
import org.apache.flink.api.java.typeutils.TypeExtractor;
Expand Down Expand Up @@ -163,7 +163,6 @@ public static void main(String[] args) throws Exception {
// partition on the address to make sure equal addresses
// end up in the same state machine flatMap function
.keyBy(Event::sourceAddress)
.enableAsyncState()
// the function that evaluates the state machine over the sequence of events
.flatMap(new StateMachineMapper());

Expand Down Expand Up @@ -214,32 +213,25 @@ public void open(OpenContext openContext) {
@Override
public void flatMap(Event evt, Collector<Alert> out) throws Exception {
// get the current state for the key (source address)
currentState
.asyncValue()
.thenAccept(
state -> {
// if no state exists, yet, the state must be the state machine's
// initial state
if (state == null) {
state = State.Initial;
}

// ask the state machine what state we should go to based on the
// given event

State nextState = state.transition(evt.type());
if (nextState == State.InvalidTransition) {
// the current event resulted in an invalid transition
// raise an alert!
out.collect(new Alert(evt.sourceAddress(), state, evt.type()));
} else if (nextState.isTerminal()) {
// we reached a terminal state, clean up the current state
currentState.asyncClear();
} else {
// remember the new state
currentState.asyncUpdate(nextState);
}
});
State state = currentState.value();

// if no state exists, yet, the state must be the state machine's initial state
if (state == null) {
state = State.Initial;
}

// ask the state machine what state we should go to based on the given event
State nextState = state.transition(evt.type());
if (nextState == State.InvalidTransition) {
// the current event resulted in an invalid transition — raise an alert!
out.collect(new Alert(evt.sourceAddress(), state, evt.type()));
} else if (nextState.isTerminal()) {
// we reached a terminal state, clean up the current state
currentState.clear();
} else {
// remember the new state
currentState.update(nextState);
}
}
}

Expand Down