Add samples and tweak metrics reader/writers till they work

spring-boot-samples/spring-boot-sample-metrics-redis/src/main/java/sample/metrics/redis/AggregateMetricsConfiguration.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2012-2015 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 sample.metrics.redis;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.actuate.endpoint.MetricReaderPublicMetrics;
+import org.springframework.boot.actuate.endpoint.PublicMetrics;
+import org.springframework.boot.actuate.metrics.aggregate.AggregateMetricReader;
+import org.springframework.boot.actuate.metrics.reader.MetricReader;
+import org.springframework.boot.actuate.metrics.repository.redis.RedisMetricRepository;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.redis.connection.RedisConnectionFactory;
+
+/**
+ * @author Dave Syer
+ */
+@Configuration
+public class AggregateMetricsConfiguration {
+
+	@Autowired
+	private ExportProperties export;
+
+	@Autowired
+	private RedisConnectionFactory connectionFactory;
+
+	@Bean
+	public PublicMetrics metricsAggregate() {
+		return new MetricReaderPublicMetrics(aggregatesMetricReader());
+	}
+
+	private MetricReader globalMetricsForAggregation() {
+		return new RedisMetricRepository(this.connectionFactory,
+				this.export.getAggregatePrefix(), this.export.getKey());
+	}
+
+	private MetricReader aggregatesMetricReader() {
+		AggregateMetricReader repository = new AggregateMetricReader(
+				globalMetricsForAggregation());
+		return repository;
+	}
+}

spring-boot-samples/spring-boot-sample-metrics-redis/src/main/java/sample/metrics/redis/ExportProperties.java

@@ -17,6 +17,7 @@
 package sample.metrics.redis;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.util.StringUtils;
 
 @ConfigurationProperties("metrics.export")
 class ExportProperties {
@@ -40,4 +41,15 @@ class ExportProperties {
 		this.key = key;
 	}
 
+	public String getAggregatePrefix() {
+		String[] tokens = StringUtils.delimitedListToStringArray(this.prefix, ".");
+		if (tokens.length > 1) {
+			if (StringUtils.hasText(tokens[1])) {
+				// If the prefix has 2 or more non-trivial parts, use the first 1
+				return tokens[0];
+			}
+		}
+		return this.prefix;
+	}
+
 }

spring-boot-samples/spring-boot-sample-metrics-redis/src/main/resources/application.properties

@@ -1,2 +1,3 @@
 service.name: Phil
-metrics.export.prefix: ${spring.application.name:application}:${random.value:0000}
+metrics.export.prefix: metrics.sample.${random.value:0000}.${spring.application.name:application}
+metrics.export.key: keys.metrics.sample