Add example model of Apache Geode/Pivotal GemFire CQ query event handlers and types.

geode-spring-boot-starter/src/test/java/example/geode/query/cq/event/TemperatureReading.java

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+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+package example.geode.query.cq.event;
+
+import java.io.Serializable;
+import java.time.LocalDateTime;
+
+import org.springframework.util.ObjectUtils;
+
+import lombok.Data;
+import lombok.NonNull;
+import lombok.RequiredArgsConstructor;
+
+/**
+ * The {@link TemperatureReading} class is an Abstract Data Type (ADT) modeling a temperature event,
+ * tracking the recorded temperature, unit and timestamp of the event.
+ *
+ * @author John Blum
+ * @see example.geode.query.cq.event.TemperatureUnit
+ * @since 1.0.0
+ */
+@Data
+@RequiredArgsConstructor(staticName = "of")
+public class TemperatureReading {
+
+	@NonNull
+	private Integer temperature;
+
+	private LocalDateTime timestamp = LocalDateTime.now();
+
+	private TemperatureUnit temperatureUnit = TemperatureUnit.defaultTemperatureUnit();
+
+	public TemperatureReading at(LocalDateTime timestamp) {
+		setTimestamp(timestamp);
+		return this;
+	}
+
+	public TemperatureReading in(TemperatureUnit temperatureUnit) {
+		setTemperatureUnit(temperatureUnit);
+		return this;
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+
+		if (this == obj) {
+			return true;
+		}
+
+		if (!(obj instanceof TemperatureReading)) {
+			return false;
+		}
+
+		TemperatureReading that = (TemperatureReading) obj;
+
+		return ObjectUtils.nullSafeEquals(this.getTemperature(), that.getTemperature())
+			&& ObjectUtils.nullSafeEquals(this.getTemperatureUnit(), that.getTemperatureUnit());
+	}
+
+	@Override
+	public int hashCode() {
+
+		int hashValue = 17;
+
+		hashValue = 37 * hashValue + ObjectUtils.nullSafeHashCode(getTemperature());
+		hashValue = 37 * hashValue + ObjectUtils.nullSafeHashCode(getTemperatureUnit());
+
+		return hashValue;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("%d %s", getTemperature(), getTemperatureUnit());
+	}
+}

geode-spring-boot-starter/src/test/java/example/geode/query/cq/event/TemperatureReadingsContinuousQueriesHandler.java

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+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+package example.geode.query.cq.event;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.stream.Collectors;
+
+import org.apache.geode.cache.query.CqEvent;
+import org.springframework.data.gemfire.listener.annotation.ContinuousQuery;
+
+/**
+ * The TemperatureReadingsContinuousQueriesHandler class...
+ *
+ * @author John Blum
+ * @since 1.0.0
+ */
+@SuppressWarnings("unused")
+public final class TemperatureReadingsContinuousQueriesHandler {
+
+	private final AtomicInteger temperatureReadingsCounter = new AtomicInteger(0);
+
+	private final List<TemperatureReading> boilingTemperatureReadings = new CopyOnWriteArrayList<>();
+	private final List<TemperatureReading> freezingTemperatureReadings = new CopyOnWriteArrayList<>();
+
+	public List<TemperatureReading> getBoilingTemperatureReadings() {
+		return Collections.unmodifiableList(this.boilingTemperatureReadings);
+	}
+
+	public List<Integer> getBoilingTemperatures() {
+
+		return getBoilingTemperatureReadings().stream()
+			.map(TemperatureReading::getTemperature)
+			.collect(Collectors.toList());
+	}
+
+	public List<TemperatureReading> getFreezingTemperatureReadings() {
+		return Collections.unmodifiableList(this.freezingTemperatureReadings);
+	}
+
+	public List<Integer> getFreezingTemperatures() {
+
+		return getFreezingTemperatureReadings().stream()
+			.map(TemperatureReading::getTemperature)
+			.collect(Collectors.toList());
+	}
+
+	public int getTemperatureReadingCount() {
+		return this.temperatureReadingsCounter.get();
+	}
+
+	@ContinuousQuery(name = "BoilingTemperatures",
+		query = "SELECT * FROM /TemperatureReadings r WHERE r.temperature >= 212")
+	public void boilingTemperatures(CqEvent event) {
+
+		TemperatureReading temperatureReading = (TemperatureReading) event.getNewValue();
+
+		this.boilingTemperatureReadings.add(temperatureReading);
+		this.temperatureReadingsCounter.incrementAndGet();
+	}
+
+	@ContinuousQuery(name = "FreezingTemperatures",
+		query = "SELECT * FROM /TemperatureReadings r WHERE r.temperature <= 32")
+	public void freezingTemperatures(CqEvent event) {
+
+		TemperatureReading temperatureReading = (TemperatureReading) event.getNewValue();
+
+		this.freezingTemperatureReadings.add(temperatureReading);
+		this.temperatureReadingsCounter.incrementAndGet();
+	}
+}

geode-spring-boot-starter/src/test/java/example/geode/query/cq/event/TemperatureUnit.java

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+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+package example.geode.query.cq.event;
+
+import java.util.Locale;
+import java.util.Optional;
+
+/**
+ * The {@link TemperatureUnit} enum is an enumeration of different temperature units
+ * as defined by International System of Units (SI).
+ *
+ * @author John Blum
+ * @since 1.0.0
+ */
+@SuppressWarnings("unused")
+public enum TemperatureUnit {
+
+	CELSIUS("°C"),
+	FAHRENHEIT("°F"),
+	KELVIN("K");
+
+	public static TemperatureUnit defaultTemperatureUnit() {
+
+		return Optional.of(Locale.getDefault())
+			.map(Locale::getISO3Country)
+			.filter(Locale.US.getISO3Country()::equalsIgnoreCase)
+			.map(it -> TemperatureUnit.FAHRENHEIT)
+			.orElse(TemperatureUnit.CELSIUS);
+	}
+
+	private final String symbol;
+
+	TemperatureUnit(String symbol) {
+		this.symbol = symbol;
+	}
+
+	public String getSymbol() {
+		return this.symbol;
+	}
+
+	@Override
+	public String toString() {
+		return getSymbol();
+	}
+}