start with dropwizard sample project

Author: stefanseifert

example.yml

@@ -0,0 +1,2 @@
+template: Hello, %s!
+defaultName: Stranger

pom.xml

@@ -94,6 +94,18 @@
         </executions>
       </plugin>    
 
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <configuration>
+          <archive>
+            <manifest>
+              <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
+            </manifest>
+          </archive>
+        </configuration>
+      </plugin>
+
     </plugins>
   </build>
 

src/main/java/com/example/helloworld/HelloWorldApplication.java

@@ -0,0 +1,58 @@
+/*
+ * #%L
+ * wcm.io
+ * %%
+ * Copyright (C) 2015 wcm.io
+ * %%
+ * 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.
+ * #L%
+ */
+package com.example.helloworld;
+
+import io.dropwizard.Application;
+import io.dropwizard.setup.Bootstrap;
+import io.dropwizard.setup.Environment;
+
+import com.example.helloworld.health.TemplateHealthCheck;
+import com.example.helloworld.resources.HelloWorldResource;
+
+public class HelloWorldApplication extends Application<HelloWorldConfiguration> {
+
+  public static void main(String[] args) throws Exception {
+    new HelloWorldApplication().run(args);
+  }
+
+  @Override
+  public String getName() {
+    return "hello-world";
+  }
+
+  @Override
+  public void initialize(Bootstrap<HelloWorldConfiguration> bootstrap) {
+    // nothing to do yet
+  }
+
+  @Override
+  public void run(HelloWorldConfiguration configuration,
+      Environment environment) {
+    final HelloWorldResource resource = new HelloWorldResource(
+        configuration.getTemplate(),
+        configuration.getDefaultName()
+        );
+    final TemplateHealthCheck healthCheck =
+        new TemplateHealthCheck(configuration.getTemplate());
+    environment.healthChecks().register("template", healthCheck);
+    environment.jersey().register(resource);
+  }
+
+}

src/main/java/com/example/helloworld/HelloWorldConfiguration.java

@@ -0,0 +1,55 @@
+/*
+ * #%L
+ * wcm.io
+ * %%
+ * Copyright (C) 2015 wcm.io
+ * %%
+ * 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.
+ * #L%
+ */
+package com.example.helloworld;
+
+import io.dropwizard.Configuration;
+
+import org.hibernate.validator.constraints.NotEmpty;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+public class HelloWorldConfiguration extends Configuration {
+
+  @NotEmpty
+  private String template;
+
+  @NotEmpty
+  private String defaultName = "Stranger";
+
+  @JsonProperty
+  public String getTemplate() {
+    return template;
+  }
+
+  @JsonProperty
+  public void setTemplate(String template) {
+    this.template = template;
+  }
+
+  @JsonProperty
+  public String getDefaultName() {
+    return defaultName;
+  }
+
+  @JsonProperty
+  public void setDefaultName(String name) {
+    this.defaultName = name;
+  }
+}

src/main/java/com/example/helloworld/core/Saying.java

@@ -0,0 +1,51 @@
+/*
+ * #%L
+ * wcm.io
+ * %%
+ * Copyright (C) 2015 wcm.io
+ * %%
+ * 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.
+ * #L%
+ */
+package com.example.helloworld.core;
+
+import org.hibernate.validator.constraints.Length;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+public class Saying {
+
+  private long id;
+
+  @Length(max = 3)
+  private String content;
+
+  public Saying() {
+    // Jackson deserialization
+  }
+
+  public Saying(long id, String content) {
+    this.id = id;
+    this.content = content;
+  }
+
+  @JsonProperty
+  public long getId() {
+    return id;
+  }
+
+  @JsonProperty
+  public String getContent() {
+    return content;
+  }
+}

src/main/java/com/example/helloworld/health/TemplateHealthCheck.java

@@ -0,0 +1,41 @@
+/*
+ * #%L
+ * wcm.io
+ * %%
+ * Copyright (C) 2015 wcm.io
+ * %%
+ * 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.
+ * #L%
+ */
+package com.example.helloworld.health;
+
+import com.codahale.metrics.health.HealthCheck;
+
+public class TemplateHealthCheck extends HealthCheck {
+
+  private final String template;
+
+  public TemplateHealthCheck(String template) {
+    this.template = template;
+  }
+
+  @Override
+  protected Result check() throws Exception {
+    final String saying = String.format(template, "TEST");
+    if (!saying.contains("TEST")) {
+      return Result.unhealthy("template doesn't include a name");
+    }
+    return Result.healthy();
+  }
+
+}

src/main/java/com/example/helloworld/resources/HelloWorldResource.java

@@ -0,0 +1,55 @@
+/*
+ * #%L
+ * wcm.io
+ * %%
+ * Copyright (C) 2015 wcm.io
+ * %%
+ * 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.
+ * #L%
+ */
+package com.example.helloworld.resources;
+
+import java.util.concurrent.atomic.AtomicLong;
+
+import javax.ws.rs.GET;
+import javax.ws.rs.Path;
+import javax.ws.rs.Produces;
+import javax.ws.rs.QueryParam;
+import javax.ws.rs.core.MediaType;
+
+import com.codahale.metrics.annotation.Timed;
+import com.example.helloworld.core.Saying;
+import com.google.common.base.Optional;
+
+@Path("/hello-world")
+@Produces(MediaType.APPLICATION_JSON)
+public class HelloWorldResource {
+
+  private final String template;
+  private final String defaultName;
+  private final AtomicLong counter;
+
+  public HelloWorldResource(String template, String defaultName) {
+    this.template = template;
+    this.defaultName = defaultName;
+    this.counter = new AtomicLong();
+  }
+
+  @GET
+  @Timed
+  public Saying sayHello(@QueryParam("name") Optional<String> name) {
+    final String value = String.format(template, name.or(defaultName));
+    return new Saying(counter.incrementAndGet(), value);
+  }
+
+}