MINOR: Move streams-examples source files under src folder

Also remove some unused imports.

Author: Guozhang Wang <wangguoz@gmail.com>

Reviewers: Ismael Juma <ismael@juma.me.uk>, Ewen Cheslack-Postava <ewen@confluent.io>

Closes #992 from guozhangwang/KSExamples

bin/kafka-run-class.sh

@@ -52,6 +52,11 @@ do
   CLASSPATH=$CLASSPATH:$file
 done
 
+for file in $base_dir/streams/examples/build/libs/kafka-streams-examples*.jar;
+do
+  CLASSPATH=$CLASSPATH:$file
+done
+
 for file in $base_dir/streams/build/dependant-libs-${SCALA_VERSION}/rocksdb*.jar;
 do
   CLASSPATH=$CLASSPATH:$file

build.gradle

@@ -259,7 +259,7 @@ for ( sv in ['2_10', '2_11'] ) {
 }
 
 def connectPkgs = ['connect:api', 'connect:runtime', 'connect:json', 'connect:file']
-def pkgs = ['clients', 'examples', 'log4j-appender', 'tools', 'streams'] + connectPkgs
+def pkgs = ['clients', 'examples', 'log4j-appender', 'tools', 'streams', 'streams:examples'] + connectPkgs
 
 tasks.create(name: "jarConnect", dependsOn: connectPkgs.collect { it + ":jar" }) {}
 tasks.create(name: "jarAll", dependsOn: ['jar_core_2_10', 'jar_core_2_11'] + pkgs.collect { it + ":jar" }) { }
@@ -374,6 +374,7 @@ project(':core') {
     from(project(':connect:file').jar) { into("libs/") }
     from(project(':connect:file').configurations.runtime) { into("libs/") }
     from(project(':streams').jar) { into("libs/") }
+    from(project(':streams:examples').jar) { into("libs/") }
   }
 
   jar {

checkstyle/import-control.xml

@@ -127,6 +127,11 @@
 
     <allow pkg="org.apache.kafka.streams"/>
 
+    <subpackage name="examples">
+      <allow pkg="com.fasterxml.jackson.databind" />
+      <allow pkg="org.apache.kafka.connect.json" />
+    </subpackage>
+
     <subpackage name="state">
       <allow pkg="org.rocksdb" />
     </subpackage>

streams/examples/src/main/java/org/apache/kafka/streams/examples/pageview/PageViewTypedJob.java

@@ -17,7 +17,6 @@
 
 package org.apache.kafka.streams.examples.pageview;
 
-import org.apache.kafka.clients.consumer.ConsumerConfig;
 import org.apache.kafka.common.serialization.Deserializer;
 import org.apache.kafka.common.serialization.LongDeserializer;
 import org.apache.kafka.common.serialization.LongSerializer;

streams/examples/src/main/java/org/apache/kafka/streams/examples/pageview/PageViewUntypedJob.java

@@ -20,7 +20,6 @@ package org.apache.kafka.streams.examples.pageview;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.JsonNodeFactory;
 import com.fasterxml.jackson.databind.node.ObjectNode;
-import org.apache.kafka.clients.consumer.ConsumerConfig;
 import org.apache.kafka.common.serialization.Deserializer;
 import org.apache.kafka.common.serialization.LongDeserializer;
 import org.apache.kafka.common.serialization.LongSerializer;
@@ -93,15 +92,15 @@ public class PageViewUntypedJob {
 
         KStream<JsonNode, JsonNode> regionCount = views
                 .leftJoin(userRegions, new ValueJoiner<JsonNode, String, JsonNode>() {
-                            @Override
-                            public JsonNode apply(JsonNode view, String region) {
-                                ObjectNode jNode = JsonNodeFactory.instance.objectNode();
+                    @Override
+                    public JsonNode apply(JsonNode view, String region) {
+                        ObjectNode jNode = JsonNodeFactory.instance.objectNode();
 
-                                return jNode.put("user", view.get("user").textValue())
-                                        .put("page", view.get("page").textValue())
-                                        .put("region", region == null ? "UNKNOWN" : region);
-                            }
-                        })
+                        return jNode.put("user", view.get("user").textValue())
+                                .put("page", view.get("page").textValue())
+                                .put("region", region == null ? "UNKNOWN" : region);
+                    }
+                })
                 .map(new KeyValueMapper<String, JsonNode, KeyValue<String, JsonNode>>() {
                     @Override
                     public KeyValue<String, JsonNode> apply(String user, JsonNode viewRegion) {

streams/examples/src/main/java/org/apache/kafka/streams/examples/pipe/PipeJob.java

@@ -17,7 +17,6 @@
 
 package org.apache.kafka.streams.examples.pipe;
 
-import org.apache.kafka.clients.consumer.ConsumerConfig;
 import org.apache.kafka.common.serialization.StringDeserializer;
 import org.apache.kafka.common.serialization.StringSerializer;
 import org.apache.kafka.streams.kstream.KStreamBuilder;

streams/examples/src/main/java/org/apache/kafka/streams/examples/wordcount/WordCountJob.java

@@ -17,7 +17,6 @@
 
 package org.apache.kafka.streams.examples.wordcount;
 
-import org.apache.kafka.clients.consumer.ConsumerConfig;
 import org.apache.kafka.common.serialization.Deserializer;
 import org.apache.kafka.common.serialization.LongDeserializer;
 import org.apache.kafka.common.serialization.LongSerializer;

streams/examples/src/main/java/org/apache/kafka/streams/examples/wordcount/WordCountProcessorJob.java

@@ -17,7 +17,6 @@
 
 package org.apache.kafka.streams.examples.wordcount;
 
-import org.apache.kafka.clients.consumer.ConsumerConfig;
 import org.apache.kafka.common.serialization.StringDeserializer;
 import org.apache.kafka.common.serialization.StringSerializer;
 import org.apache.kafka.streams.KeyValue;
@@ -64,7 +63,7 @@ public class WordCountProcessorJob {
 
                 @Override
                 public void process(String dummy, String line) {
-                    String words[] = line.toLowerCase().split(" ");
+                    String[] words = line.toLowerCase().split(" ");
 
                     for (String word : words) {
                         Integer oldValue = this.kvStore.get(word);