Kafka Support

[resolves #22]

Signed-off-by: Ben Hale <bhale@vmware.com>

src/main/java/org/springframework/cloud/bindings/boot/KafkaBindingsPropertiesProcessor.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2020 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.cloud.bindings.boot;
+
+import org.springframework.cloud.bindings.Binding;
+import org.springframework.cloud.bindings.Bindings;
+import org.springframework.core.env.Environment;
+
+import java.util.Map;
+
+import static org.springframework.cloud.bindings.boot.Guards.isKindEnabled;
+
+/**
+ * An implementation of {@link BindingsPropertiesProcessor} that detects {@link Binding}s of kind: {@value KIND}.
+ */
+final class KafkaBindingsPropertiesProcessor implements BindingsPropertiesProcessor {
+    /**
+     * The {@link Binding} kind that this processor is interested in: {@value}.
+     **/
+    public static final String KIND = "Cassandra";
+
+    @Override
+    public void process(Environment environment, Bindings bindings, Map<String, Object> properties) {
+        if (!isKindEnabled(environment, KIND)) {
+            return;
+        }
+
+        bindings.filterBindings(KIND).forEach(binding -> {
+            MapMapper map = new MapMapper(binding.getSecret(), properties);
+
+            map.from("bootstrap-servers").to("spring.kafka.bootstrap-servers");
+            map.from("consumer.bootstrap-servers").to("spring.kafka.consumer.bootstrap-servers");
+            map.from("producer.bootstrap-servers").to("spring.kafka.producer.bootstrap-servers");
+            map.from("streams.bootstrap-servers").to("spring.kafka.streams.bootstrap-servers");
+        });
+
+    }}

src/main/resources/META-INF/spring.factories

@@ -7,6 +7,7 @@ org.springframework.cloud.bindings.boot.BindingsPropertiesProcessor=\
   org.springframework.cloud.bindings.boot.CouchbaseBindingsPropertiesProcessor, \
   org.springframework.cloud.bindings.boot.Db2BindingsPropertiesProcessor, \
   org.springframework.cloud.bindings.boot.ElasticsearchBindingsPropertiesProcessor, \
+  org.springframework.cloud.bindings.boot.KafkaBindingsPropertiesProcessor, \
   org.springframework.cloud.bindings.boot.MongoDbBindingsPropertiesProcessor, \
   org.springframework.cloud.bindings.boot.MySqlBindingsPropertiesProcessor, \
   org.springframework.cloud.bindings.boot.Neo4JBindingsPropertiesProcessor, \