Polish

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/MetricFilterAutoConfiguration.java

@@ -72,14 +72,6 @@ public class MetricFilterAutoConfiguration {
 	@Order(Ordered.HIGHEST_PRECEDENCE)
 	private final class MetricsFilter extends OncePerRequestFilter {
 
-		/*
-		 * (non-Javadoc)
-		 * 
-		 * @see
-		 * org.springframework.web.filter.OncePerRequestFilter#doFilterInternal(javax.
-		 * servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse,
-		 * javax.servlet.FilterChain)
-		 */
 		@Override
 		protected void doFilterInternal(HttpServletRequest request,
 				HttpServletResponse response, FilterChain chain) throws ServletException,

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/export/PrefixMetricGroupExporter.java

@@ -42,7 +42,6 @@ public class PrefixMetricGroupExporter extends AbstractMetricExporter {
 	/**
 	 * Create a new exporter for metrics to a writer based on an empty prefix for the
 	 * metric names.
-	 * 
 	 * @param reader a reader as the source of metrics
 	 * @param writer the writer to send the metrics to
 	 */
@@ -53,7 +52,6 @@ public class PrefixMetricGroupExporter extends AbstractMetricExporter {
 	/**
 	 * Create a new exporter for metrics to a writer based on a prefix for the metric
 	 * names.
-	 * 
 	 * @param reader a reader as the source of metrics
 	 * @param writer the writer to send the metrics to
 	 * @param prefix the prefix for metrics to export

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/reader/CompositeMetricReader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2013 the original author or authors.
+ * Copyright 2012-2014 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.
@@ -17,26 +17,28 @@
 package org.springframework.boot.actuate.metrics.reader;
 
 import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Collections;
 import java.util.List;
 
 import org.springframework.boot.actuate.metrics.Metric;
 
 /**
+ * Composite implementation of {@link MetricReader}.
+ * 
  * @author Dave Syer
  */
 public class CompositeMetricReader implements MetricReader {
 
-	private List<MetricReader> delegates = Collections.emptyList();
+	private final List<MetricReader> readers = new ArrayList<MetricReader>();
 
-	public void setDelegates(Collection<MetricReader> delegates) {
+	public CompositeMetricReader(MetricReader... readers) {
-		this.delegates = new ArrayList<MetricReader>(delegates);
+		for (MetricReader reader : readers) {
+			this.readers.add(reader);
+		}
 	}
 
 	@Override
 	public Metric<?> findOne(String metricName) {
-		for (MetricReader delegate : this.delegates) {
+		for (MetricReader delegate : this.readers) {
 			Metric<?> value = delegate.findOne(metricName);
 			if (value != null) {
 				return value;
@@ -48,7 +50,7 @@ public class CompositeMetricReader implements MetricReader {
 	@Override
 	public Iterable<Metric<?>> findAll() {
 		List<Metric<?>> values = new ArrayList<Metric<?>>((int) count());
-		for (MetricReader delegate : this.delegates) {
+		for (MetricReader delegate : this.readers) {
 			Iterable<Metric<?>> all = delegate.findAll();
 			for (Metric<?> value : all) {
 				values.add(value);
@@ -60,7 +62,7 @@ public class CompositeMetricReader implements MetricReader {
 	@Override
 	public long count() {
 		long count = 0;
-		for (MetricReader delegate : this.delegates) {
+		for (MetricReader delegate : this.readers) {
 			count += delegate.count();
 
 		}

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/reader/MetricReader.java

@@ -28,7 +28,6 @@ public interface MetricReader {
 	/**
 	 * Find an instance of the metric with the given name (usually the latest recorded
 	 * value).
-	 * 
 	 * @param metricName the name of the metric to find
 	 * @return a metric value or null if there are none with that name
 	 */
@@ -36,14 +35,12 @@ public interface MetricReader {
 
 	/**
 	 * Find all the metrics known to this reader.
-	 * 
 	 * @return all instances of metrics known to this reader
 	 */
 	Iterable<Metric<?>> findAll();
 
 	/**
 	 * The number of metrics known to this reader.
-	 * 
 	 * @return the number of metrics
 	 */
 	long count();

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/reader/PrefixMetricReader.java

@@ -27,7 +27,6 @@ public interface PrefixMetricReader {
 
 	/**
 	 * Find all metrics whose name starts with the given prefix.
-	 * 
 	 * @param prefix the prefix for metric names
 	 * @return all metrics with names starting with the prefix
 	 */

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/repository/MultiMetricRepository.java

@@ -31,7 +31,6 @@ public interface MultiMetricRepository extends PrefixMetricReader {
 
 	/**
 	 * Save some metric values and associate them with a group name.
-	 * 
 	 * @param group the name of the group
 	 * @param values the metric values to save
 	 */
@@ -40,14 +39,12 @@ public interface MultiMetricRepository extends PrefixMetricReader {
 	/**
 	 * Rest the values of all metrics in the group. Implementations may choose to discard
 	 * the old values.
-	 * 
 	 * @param group reset the whole group
 	 */
 	void reset(String group);
 
 	/**
 	 * The names of all the groups known to this repository
-	 * 
 	 * @return all available group names
 	 */
 	Iterable<String> groups();

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/repository/redis/RedisMetricRepository.java

@@ -64,7 +64,6 @@ public class RedisMetricRepository implements MetricRepository {
 
 	/**
 	 * The prefix for all metrics keys.
-	 * 
 	 * @param prefix the prefix to set for all metrics keys
 	 */
 	public void setPrefix(String prefix) {
@@ -79,7 +78,6 @@ public class RedisMetricRepository implements MetricRepository {
 	 * zset under this key. Defaults to "keys.spring.metrics". REad operations, especially
 	 * {@link #findAll()} and {@link #count()}, will be much more efficient if the key is
 	 * unique to the {@link #setPrefix(String) prefix} of this repository.
-	 * 
 	 * @param key the key to set
 	 */
 	public void setKey(String key) {

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/rich/RichGauge.java

@@ -46,11 +46,8 @@ public final class RichGauge {
 	private double alpha;
 
 	/**
-	 * Creates an "empty" gauge.
+	 * Creates an "empty" gauge. The average, max and min will be zero, but this initial
-	 * 
+	 * value will not be included after the first value has been set on the gauge.
-	 * The average, max and min will be zero, but this initial value will not be included
-	 * after the first value has been set on the gauge.
-	 * 
 	 * @param name the name under which the gauge will be stored.
 	 */
 	public RichGauge(String name) {

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/rich/RichGaugeReader.java

@@ -25,7 +25,6 @@ public interface RichGaugeReader {
 
 	/**
 	 * Find a single instance of a rich gauge by name.
-	 * 
 	 * @param name the name of the gauge
 	 * @return a rich gauge value
 	 */
@@ -33,7 +32,6 @@ public interface RichGaugeReader {
 
 	/**
 	 * Find all instances of rich gauge known to this reader.
-	 * 
 	 * @return all instances known to this reader
 	 */
 	Iterable<RichGauge> findAll();

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/writer/MetricWriter.java

@@ -28,14 +28,12 @@ public interface MetricWriter {
 	/**
 	 * Increment the value of a metric (or decrement if the delta is negative). The name
 	 * of the delta is the name of the metric to increment.
-	 * 
 	 * @param delta the amount to increment by
 	 */
 	void increment(Delta<?> delta);
 
 	/**
 	 * Set the value of a metric.
-	 * 
 	 * @param value
 	 */
 	void set(Metric<?> value);
@@ -43,7 +41,6 @@ public interface MetricWriter {
 	/**
 	 * Reset the value of a metric, usually to zero value. Implementations can discard the
 	 * old values if desired, but may choose not to.
-	 * 
 	 * @param metricName the name to reset
 	 */
 	void reset(String metricName);

spring-boot/src/main/java/org/springframework/boot/SpringApplication.java

@@ -375,24 +375,27 @@ public class SpringApplication {
 	}
 
 	protected void handleError(ConfigurableApplicationContext context,
-			ApplicationEventMulticaster multicaster, Throwable ex, String... args) {
+			ApplicationEventMulticaster multicaster, Throwable exception, String... args) {
 		try {
 			multicaster.multicastEvent(new SpringApplicationErrorEvent(this, context,
-					args, ex));
+					args, exception));
 		}
-		catch (Exception e) {
+		catch (Exception ex) {
 			// We don't want to fail here and mask the original exception
 			if (this.log.isDebugEnabled()) {
-				this.log.error("Error handling failed", e);
+				this.log.error("Error handling failed", ex);
 			}
 			else {
-				this.log.warn("Error handling failed (" + e.getMessage() + ")");
+				this.log.warn("Error handling failed (" + ex.getMessage() == null ? "no error message"
+						: ex.getMessage() + ")");
 			}
 		}
+		finally {
 			if (context != null) {
 				context.close();
 			}
 		}
+	}
 
 	private void registerListeners(ApplicationEventMulticaster multicaster,
 			Set<Object> sources) {
@@ -524,7 +527,6 @@ public class SpringApplication {
 	 * @see #setApplicationContextClass(Class)
 	 */
 	protected ConfigurableApplicationContext createApplicationContext() {
-
 		Class<?> contextClass = this.applicationContextClass;
 		if (contextClass == null) {
 			try {
@@ -538,9 +540,7 @@ public class SpringApplication {
 								+ "please specify an ApplicationContextClass", ex);
 			}
 		}
-
 		return (ConfigurableApplicationContext) BeanUtils.instantiate(contextClass);
-
 	}
 
 	/**