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| import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.common.state.MapState;
import org.apache.flink.api.common.state.MapStateDescriptor;
import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
import org.apache.flink.api.common.typeinfo.TypeHint;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.java.functions.KeySelector;
import org.apache.flink.api.java.typeutils.ListTypeInfo;
import org.apache.flink.streaming.api.datastream.BroadcastStream;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.datastream.KeyedStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.co.KeyedBroadcastProcessFunction;
import org.apache.flink.util.Collector;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
enum Shape {
SQUARE,
CIRCLE,
TRIANGLE;
}
class Item {
Shape shape;
String color;
Item(Shape shape, String color) {
this.shape = shape;
this.color = color;
}
public Shape getShape() {
return shape;
}
public String getColor() {
return color;
}
@Override
public String toString() {
return "{'shape':'" + this.shape.toString() + "','color': '" + this.color + "'}";
}
}
class Rule {
String name;
Shape first;
Shape second;
Rule(String name, Shape first, Shape second) {
this.name = name;
this.first = first;
this.second = second;
}
@Override
public String toString() {
return "{'name':'" + this.name + "','first': '" + this.first + "','second':'" + this.second + "'}";
}
}
public class WQTest {
public static void main(String[] args) throws Exception {
StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
Collection<String> originCollection = new ArrayList<>();
originCollection.add("SQUARE BLUE");
originCollection.add("SQUARE BLUE");
originCollection.add("CIRCLE BLUE");
originCollection.add("CIRCLE RED");
originCollection.add("CIRCLE BLUE");
Collection<String> ruleCollection = new ArrayList<>();
ruleCollection.add("1 SQUARE CIRCLE");
DataStream<String> originStream = env.fromCollection(originCollection);
DataStream<Item> itemStream = originStream.map(new MapFunction<String, Item>() {
@Override
public Item map(String s) throws Exception {
String[] content = s.split(" ");
return new Item(Shape.valueOf(content[0]), content[1]);
}
});
KeyedStream<Item, String> colorPartitionedStream = itemStream.keyBy(new KeySelector<Item, String>() {
@Override
public String getKey(Item item) throws Exception {
return item.getColor();
}
});
DataStream<Rule> ruleStream = env.fromCollection(ruleCollection).map(new MapFunction<String, Rule>() {
@Override
public Rule map(String s) throws Exception {
String[] content = s.split(" ");
return new Rule(content[0], Shape.valueOf(content[1]), Shape.valueOf(content[2]));
}
});
MapStateDescriptor<String, Rule> ruleStateDescriptor = new MapStateDescriptor<>(
"RulesBroadcastState",
BasicTypeInfo.STRING_TYPE_INFO,
TypeInformation.of(new TypeHint<Rule>() {
}));
BroadcastStream<Rule> ruleBroadcastStream = ruleStream.broadcast(ruleStateDescriptor);
DataStream<String> output = colorPartitionedStream.connect(ruleBroadcastStream).process(
new KeyedBroadcastProcessFunction<String, Item, Rule, String>() {
private final MapStateDescriptor<String, List<Item>> mapStateDesc = new MapStateDescriptor<>(
"items",
BasicTypeInfo.STRING_TYPE_INFO,
new ListTypeInfo<>(Item.class));
private final MapStateDescriptor<String, Rule> ruleStateDescriptor = new MapStateDescriptor<>(
"RulesBroadcastState",
BasicTypeInfo.STRING_TYPE_INFO,
TypeInformation.of(new TypeHint<Rule>() {
}));
@Override
public void processBroadcastElement(Rule value,
Context ctx,
Collector<String> out) throws Exception {
ctx.getBroadcastState(ruleStateDescriptor).put(value.name, value);
}
@Override
public void processElement(Item value,
ReadOnlyContext ctx,
Collector<String> out) throws Exception {
final MapState<String, List<Item>> state = getRuntimeContext().getMapState(mapStateDesc);
final Shape shape = value.getShape();
for (Map.Entry<String, Rule> entry :
ctx.getBroadcastState(ruleStateDescriptor).immutableEntries()) {
final String ruleName = entry.getKey();
final Rule rule = entry.getValue();
List<Item> stored = state.get(ruleName);
if (stored == null) {
stored = new ArrayList<>();
}
if (shape == rule.second && !stored.isEmpty()) {
for (Item i : stored) {
out.collect("MATCH: " + i + " - " + value);
}
stored.clear();
}
if (shape.equals(rule.first)) {
stored.add(value);
}
if (stored.isEmpty()) {
state.remove(ruleName);
} else {
state.put(ruleName, stored);
}
}
}
}
);
output.print();
env.execute();
}
}
|