INT-4373: Fix channel error count

JIRA: https://jira.spring.io/browse/INT-4373

Error count is wrong when just counts enabled.

CheckStyle fix.

Reduce send timeout in test.

spring-integration-core/src/main/java/org/springframework/integration/support/management/DefaultMessageChannelMetrics.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2009-2015 the original author or authors.
+ * Copyright 2009-2017 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
@@ -21,6 +21,7 @@ import java.util.concurrent.atomic.AtomicLong;
  * @author Dave Syer
  * @author Helena Edelson
  * @author Gary Russell
+ * @author Ivan Krizsan
  * @since 2.0
  */
 public class DefaultMessageChannelMetrics extends AbstractMessageChannelMetrics {
@@ -106,10 +107,12 @@ public class DefaultMessageChannelMetrics extends AbstractMessageChannelMetrics
 
 	@Override
 	public void afterSend(MetricsContext context, boolean result) {
-		if (result && isFullStatsEnabled()) {
-			long now = System.nanoTime();
-			this.sendSuccessRatio.success(now);
-			this.sendDuration.append(now - ((DefaultChannelMetricsContext) context).start);
+		if (result) {
+			if (isFullStatsEnabled()) {
+				long now = System.nanoTime();
+				this.sendSuccessRatio.success(now);
+				this.sendDuration.append(now - ((DefaultChannelMetricsContext) context).start);
+			}
 		}
 		else {
 			if (isFullStatsEnabled()) {

spring-integration-core/src/test/java/org/springframework/integration/support/management/DefaultMessageChannelMetricsTests.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright 2017 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 org.springframework.integration.support.management;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import org.springframework.integration.channel.QueueChannel;
+import org.springframework.integration.support.MessageBuilder;
+import org.springframework.messaging.Message;
+
+/**
+ * @author Ivan Krizsan
+ */
+public class DefaultMessageChannelMetricsTests {
+
+	protected final static int MESSAGE_COUNT = 10;
+
+	protected final static long SEND_TIMEOUT = 1;
+
+	@Test
+	public void errorCountWithCountsEnabledOnlySuccessTest() {
+		final QueueChannel theMessageChannel = new QueueChannel();
+		theMessageChannel.setCountsEnabled(true);
+
+
+		for (int i = 0; i < MESSAGE_COUNT; i++) {
+			Message<String> theInputMessage =
+					MessageBuilder.withPayload(Integer.toString(i)).build();
+			theMessageChannel.send(theInputMessage, SEND_TIMEOUT);
+		}
+
+		Assert.assertEquals(
+				"Message count should match number of sent messages",
+				MESSAGE_COUNT,
+				theMessageChannel.getSendCount());
+		Assert.assertEquals(
+				"Error count should indicate no errors",
+				0,
+				theMessageChannel.getSendErrorCount());
+	}
+
+	@Test
+	public void errorCountWithCountsEnabledHalfErrorsTest() {
+		Message<String> theInputMessage;
+		final QueueChannel theMessageChannel = new QueueChannel(MESSAGE_COUNT / 2);
+		theMessageChannel.setCountsEnabled(true);
+
+		for (int i = 0; i < MESSAGE_COUNT; i++) {
+			theInputMessage = MessageBuilder.withPayload(Integer.toString(i)).build();
+			theMessageChannel.send(theInputMessage, SEND_TIMEOUT);
+		}
+
+		Assert.assertEquals(
+				"Message count should match number of sent messages",
+				MESSAGE_COUNT,
+				theMessageChannel.getSendCount());
+		Assert.assertEquals(
+				"Error count should indicate errors half the messages",
+				MESSAGE_COUNT / 2,
+				theMessageChannel.getSendErrorCount());
+	}
+
+}