http-client-tutorial: first cut http-client-tutorial
authorchegar
Tue, 16 Jan 2018 19:14:34 +0000
branchhttp-client-tutorial
changeset 56013 08b6eca8daae
parent 56012 4f099d4d70b3
child 56014 ce92441f2223
http-client-tutorial: first cut
.idea/.name
.idea/compiler.xml
.idea/libraries/Maven__com_fasterxml_jackson_core_jackson_annotations_2_8_0.xml
.idea/libraries/Maven__com_fasterxml_jackson_core_jackson_core_2_8_9.xml
.idea/libraries/Maven__com_fasterxml_jackson_core_jackson_databind_2_8_9.xml
.idea/libraries/Maven__junit_junit_4_11.xml
.idea/libraries/Maven__org_hamcrest_hamcrest_core_1_3.xml
.idea/misc.xml
.idea/modules.xml
.idea/vcs.xml
.idea/workspace.xml
http-tutorial.iml
pom.xml
src/main/java/openjdk/http/tutorial/exercise1/Retrievals.java
src/main/main.iml
src/test/java/openjdk/http/tutorial/Exercise1Test.java
src/test/test.iml
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.idea/.name	Tue Jan 16 19:14:34 2018 +0000
@@ -0,0 +1,1 @@
+http-client-tutorial
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.idea/compiler.xml	Tue Jan 16 19:14:34 2018 +0000
@@ -0,0 +1,29 @@
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\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.idea/libraries/Maven__com_fasterxml_jackson_core_jackson_annotations_2_8_0.xml	Tue Jan 16 19:14:34 2018 +0000
@@ -0,0 +1,13 @@
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.idea/libraries/Maven__com_fasterxml_jackson_core_jackson_core_2_8_9.xml	Tue Jan 16 19:14:34 2018 +0000
@@ -0,0 +1,13 @@
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
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+      <option name="VM_PARAMETERS" />
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+      <option name="ENV_VARIABLES" />
+      <option name="PASS_PARENT_ENVS" value="true" />
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+    <configuration default="true" type="JUnit" factoryName="JUnit">
+      <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
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+      <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
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+      <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$" />
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+      <option name="VM_PARAMETERS" value="-Xmx512m -Xms256m -XX:MaxPermSize=250m -ea" />
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+    <configuration default="true" type="TestNG" factoryName="TestNG">
+      <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
+      <module name="" />
+      <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
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+      <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$" />
+      <option name="OUTPUT_DIRECTORY" />
+      <option name="ANNOTATION_TYPE" />
+      <option name="ENV_VARIABLES" />
+      <option name="PASS_PARENT_ENVS" value="true" />
+      <option name="TEST_SEARCH_SCOPE">
+        <value defaultName="moduleWithDependencies" />
+      </option>
+      <option name="USE_DEFAULT_REPORTERS" value="false" />
+      <option name="PROPERTIES_FILE" />
+      <envs />
+      <properties />
+      <listeners />
+    </configuration>
+    <configuration name="&lt;template&gt;" type="WebApp" default="true" selected="false">
+      <Host>localhost</Host>
+      <Port>5050</Port>
+    </configuration>
+  </component>
+  <component name="ShelveChangesManager" show_recycled="false">
+    <option name="remove_strategy" value="false" />
+  </component>
+  <component name="SvnConfiguration">
+    <configuration>$USER_HOME$/.subversion</configuration>
+  </component>
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="370c2318-db1e-4222-8c67-6545c7e7a90a" name="Default" comment="" />
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+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1516127026428</updated>
+    </task>
+    <servers />
+  </component>
+  <component name="ToolWindowManager">
+    <frame x="251" y="24" width="1588" height="1021" extended-state="0" />
+    <editor active="true" />
+    <layout>
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+    </layout>
+  </component>
+  <component name="VcsContentAnnotationSettings">
+    <option name="myLimit" value="2678400000" />
+  </component>
+  <component name="XDebuggerManager">
+    <breakpoint-manager />
+    <watches-manager />
+  </component>
+  <component name="editorHistoryManager">
+    <entry file="file://$PROJECT_DIR$/pom.xml">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="0">
+          <caret line="0" column="0" lean-forward="false" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/openjdk/http/tutorial/Exercise1Test.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="345">
+          <caret line="23" column="0" lean-forward="false" selection-start-line="23" selection-start-column="0" selection-end-line="23" selection-end-column="0" />
+          <folding>
+            <element signature="e#0#11067#0" expanded="true" />
+            <element signature="imports" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/openjdk/http/tutorial/exercise1/Retrievals.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="441">
+          <caret line="40" column="38" lean-forward="false" selection-start-line="40" selection-start-column="38" selection-end-line="40" selection-end-column="38" />
+          <folding>
+            <element signature="e#0#8269#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+  </component>
+  <component name="hg4idea.settings">
+    <option name="RECENT_HG_ROOT_PATH" value="$PROJECT_DIR$" />
+  </component>
+  <component name="masterDetails">
+    <states>
+      <state key="ArtifactsStructureConfigurable.UI">
+        <settings>
+          <artifact-editor />
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="FacetStructureConfigurable.UI">
+        <settings>
+          <last-edited>No facets are configured</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="GlobalLibrariesConfigurable.UI">
+        <settings>
+          <last-edited>testng</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="JdkListConfigurable.UI">
+        <settings>
+          <last-edited>1.8</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="ModuleStructureConfigurable.UI">
+        <settings>
+          <last-edited>http-tutorial</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="ProjectJDKs.UI">
+        <settings>
+          <last-edited>9</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="ProjectLibrariesConfigurable.UI">
+        <settings>
+          <last-edited>Maven: org.hamcrest:hamcrest-core:1.3</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+    </states>
+  </component>
+</project>
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/http-tutorial.iml	Tue Jan 16 19:14:34 2018 +0000
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_9">
+    <output url="file://$MODULE_DIR$/target/classes" />
+    <output-test url="file://$MODULE_DIR$/target/test-classes" />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/src/main/resources" type="java-resource" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" scope="TEST" name="Maven: junit:junit:4.11" level="project" />
+    <orderEntry type="library" scope="TEST" name="Maven: org.hamcrest:hamcrest-core:1.3" level="project" />
+    <orderEntry type="library" name="Maven: com.fasterxml.jackson.core:jackson-databind:2.8.9" level="project" />
+    <orderEntry type="library" name="Maven: com.fasterxml.jackson.core:jackson-annotations:2.8.0" level="project" />
+    <orderEntry type="library" name="Maven: com.fasterxml.jackson.core:jackson-core:2.8.9" level="project" />
+  </component>
+</module>
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pom.xml	Tue Jan 16 19:14:34 2018 +0000
@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.openjdk.http.tutorial</groupId>
+    <artifactId>http-tutorial</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.7.0</version>
+                <configuration>
+                    <source>9</source>
+                    <target>9</target>
+                    <compilerArgument>--add-modules=jdk.incubator.httpclient</compilerArgument>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>2.20.1</version>
+                <configuration>
+                    <argLine>--add-modules=jdk.incubator.httpclient</argLine>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>junit</groupId>
+                <artifactId>junit</artifactId>
+                <version>4.11</version>
+                <scope>test</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>2.8.9</version>
+        </dependency>
+    </dependencies>
+
+</project>
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/java/openjdk/http/tutorial/exercise1/Retrievals.java	Tue Jan 16 19:14:34 2018 +0000
@@ -0,0 +1,229 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package openjdk.http.tutorial.exercise1;
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.net.URI;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardOpenOption;
+import java.util.Arrays;
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
+import java.util.function.Function;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import jdk.incubator.http.HttpClient;
+import jdk.incubator.http.HttpRequest;
+import jdk.incubator.http.HttpResponse;
+import jdk.incubator.http.HttpResponse.BodyHandler;
+
+import static java.lang.System.out;
+import static java.util.stream.Collectors.joining;
+import static jdk.incubator.http.HttpClient.Version.*;
+import static jdk.incubator.http.HttpResponse.BodyHandler.*;
+
+/**
+ * @author Chris Hegarty
+ */
+public class Retrievals {
+
+    /**
+     * Exercise 1.
+     *
+     * Retrieve the response status code from a request to the given
+     * URI. The returned response code will be a int.
+     *
+     * Hint: use the discard BodyHandler since the response body is not
+     * interesting.
+     *
+     * Hint: static imports reduce boilerplate when using BodyHandlers
+     * and BodyProcessors, e.g. import static
+     * jdk.incubator.http.HttpResponse.BodyHandler.discard
+     */
+    public static int retrieveTheStatusCode(URI uri)
+        throws IOException, InterruptedException
+    {
+        HttpClient client = HttpClient.newBuilder().version(HTTP_1_1).build();
+        HttpRequest request = HttpRequest.newBuilder(uri).GET().build();
+        HttpResponse<?> response = client.send(request, discard(null));
+
+        return response.statusCode();
+    }
+
+    /**
+     * Exercise 1.
+     *
+     * Retrieve the response body from a given URI. Return the response
+     * body as a String.
+     *
+     * Hint: use the asString BodyHandler to convert the HTTP response
+     * body to a String.
+     *
+     * Hint: static imports reduce boilerplate when using BodyHandlers
+     * and BodyProcessors, e.g. import static
+     * jdk.incubator.http.HttpResponse.BodyHandler.asString
+     */
+    public static String retrieveResourceAsString(URI uri)
+        throws IOException, InterruptedException
+    {
+        HttpClient client = HttpClient.newBuilder().version(HTTP_1_1).build();
+        HttpRequest request = HttpRequest.newBuilder(uri).GET().build();
+        HttpResponse<String> response = client.send(request, asString());
+
+        return response.body();
+    }
+
+    /**
+     * Exercise 2.
+     *
+     * Retrieve the response body from a given URI, streaming teh body
+     * out to a file. Return the file's Path.
+     *
+     * Hint: use {@linkplain BodyHandler#asFile} to stream the HTTP
+     * response body to a file.
+     */
+    public static Path retrieveResourceAsFile(URI uri)
+        throws IOException, InterruptedException
+    {
+        HttpClient client = HttpClient.newBuilder().build();
+        HttpRequest request = HttpRequest.newBuilder()
+                .uri(uri)
+                .version(HTTP_1_1)
+                .GET()
+                .build();
+        HttpResponse<Path> response = client.send(request,
+                asFile(Paths.get("retrieveResourceAsFile.txt"), StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.WRITE));
+
+        System.out.println("CHEGAR:   sc=" + response.statusCode());
+        System.out.println("CHEGAR:   by=" + Files.readAllLines(response.body()).stream().collect(joining()));
+
+        return response.body();
+    }
+
+
+    /**
+     * Asserts that the response code is 200 ( OK ).
+     *
+     * Can be used in CompletableFuture pipelines when checking the
+     * response of an {@linkplain HttpClient#sendAsync} call. For
+     * example:
+     *    client.sendAsync(request, bodyHandler)
+     *          .thenApply(Retrievals::require200StatusCode)
+     *          .thenApply(...)
+     *
+     */
+    public static <T> HttpResponse<T> require200StatusCode(HttpResponse<T> response) {
+        int sc = response.statusCode();
+        if (sc != 200) {
+            IOException e = new IOException("Expected 200, got: " + sc);
+            throw new UncheckedIOException(e);
+        }
+        return response;
+    }
+
+    /**
+     *  Exercise 3.
+     *
+     * Retrieve the response body from a given URI, using the
+     * asynchronous send API, sendAsync. Return a CompletableFuture that
+     * completes with the response body as a String.
+     *
+     * Hint: The {@linkplain CompletableFuture#thenApply(Function)}
+     * method can be used to map the HttpResponse to a String.
+     */
+    public static CompletableFuture<String> retrieveResourceAsStringUsingAsyncAPI(URI uri) {
+        return HttpClient.newHttpClient()
+                .sendAsync(HttpRequest.newBuilder(uri).version(HTTP_1_1).build(), asString())  // TODO: why version needed?
+                .thenApply(Retrievals::require200StatusCode)
+                .thenApply(HttpResponse::body);
+    }
+
+
+    /**
+     * Wrapper around Jackson's ObjectMapper that provides an unchecked
+     * {@code readValue}, what can be used to help solve the next
+     * exercise, 4.
+     */
+    public static class UncheckedObjectMapper extends ObjectMapper {
+
+        /** Parses the given JSON string into a Map. */
+        Map<String,String> readValue(String content) {
+            try {
+                return this.readValue(content, new TypeReference<>(){});
+            } catch (IOException ioe) {
+                throw new UncheckedIOException(ioe);
+            }
+        }
+    }
+
+    /**
+     * Exercise 4.
+     *
+     * Retrieve the response body from a given URI. The response body
+     * will be in the JSON format. The Jackson based UncheckedObjectMapper
+     * ( above ) can be used to parse the String response body into a
+     * Map.
+     *
+     * Hint: The asynchronous send API will allow construction of a
+     * pipeline of CompletableFutures.
+     *
+     * Hint: The {@linkplain CompletableFuture#thenApply(Function)}
+     * method can be used to map the HttpResponse to a String, and then
+     * again from a Sting to a Map ( via the object mapper ).
+     */
+    public CompletableFuture<Map<String,String>> JSONBodyAsMap(URI uri) {
+        UncheckedObjectMapper objectMapper = new UncheckedObjectMapper();
+        return HttpClient.newHttpClient()
+                .sendAsync(HttpRequest.newBuilder(uri).version(HTTP_1_1).build(), asString())
+                .thenApply(HttpResponse::body)
+                .thenApply(objectMapper::readValue);
+    }
+
+
+
+    /**
+     * Post the given {@code data}, and receive the same data in
+     * response. Return the response body data as a String.
+     */
+    public static String postData(URI uri, String data)
+        throws IOException, InterruptedException
+    {
+        HttpClient client = HttpClient.newBuilder().build();
+        HttpRequest request = HttpRequest.newBuilder()
+                .uri(uri)
+                .version(HTTP_1_1)
+                .POST(HttpRequest.BodyProcessor.fromString(data))
+                .build();
+        HttpResponse<String> response = client.send(request, asString());
+
+        return response.body();
+    }
+
+
+     // JSON processor
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/main.iml	Tue Jan 16 19:14:34 2018 +0000
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/java" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/test/java/openjdk/http/tutorial/Exercise1Test.java	Tue Jan 16 19:14:34 2018 +0000
@@ -0,0 +1,354 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package openjdk.http.tutorial;
+
+/**
+ * @author Chris Hegarty
+ */
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.net.URI;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
+import java.util.function.Function;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import jdk.incubator.http.HttpClient;
+import jdk.incubator.http.HttpRequest;
+import jdk.incubator.http.HttpResponse;
+import org.junit.Assert;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TestRule;
+import org.junit.rules.TestWatcher;
+import org.junit.runner.Description;
+import openjdk.http.tutorial.exercise1.Retrievals;
+import openjdk.http.tutorial.exercise1.Retrievals.UncheckedObjectMapper;
+import static java.lang.System.out;
+import static java.nio.file.StandardOpenOption.*;
+import static java.util.stream.Collectors.joining;
+import static jdk.incubator.http.HttpClient.Version.*;
+import static jdk.incubator.http.HttpResponse.BodyHandler.asFile;
+import static jdk.incubator.http.HttpResponse.BodyHandler.asString;
+import static jdk.incubator.http.HttpResponse.BodyHandler.discard;
+import static org.junit.Assert.assertEquals;
+
+public class Exercise1Test {
+
+    @Test
+    public void retrieveTheStatusCode()
+        throws IOException, InterruptedException
+    {
+        URI uri = URI.create("http://httpbin.org/get");
+
+        int expectedStatusCode = statusCode(uri);
+        int actualStatusCode = Retrievals.retrieveTheStatusCode(uri);
+
+        assertEquals("Unexpected status code",
+                     expectedStatusCode,
+                     actualStatusCode);
+    }
+
+    @Test
+    public void retrieveResourceAsString()
+        throws IOException, InterruptedException
+    {
+        URI uri = URI.create("http://httpbin.org/get");
+
+        String expectedResponseBody = bodyAsString(uri);
+        String actualResponseBody = Retrievals.retrieveResourceAsString(uri);
+
+        assertEquals("Unexpected response body",
+                     expectedResponseBody,
+                     actualResponseBody);
+    }
+
+    @Test
+    public void retrieveResourceAsFile()
+        throws IOException, InterruptedException
+    {
+        URI uri = URI.create("http://httpbin.org/get");
+
+        Path expectedResponseBodyFile = bodyAsFile(uri);
+        Path actualResponseBodyFile = Retrievals.retrieveResourceAsFile(uri);
+        byte[] b1 = Files.readAllBytes(expectedResponseBodyFile);
+        byte[] b2 = Files.readAllBytes(actualResponseBodyFile);
+
+        System.out.println("CHEGAR  b1 = " + new String(b1));
+        System.out.println("CHEGAR  b2 = " + new String(b2));
+
+        Assert.assertArrayEquals("Unexpected response body", b1, b2);
+    }
+
+    @Test
+    public void retrieveResourceAsStringUsingAsyncAPI()
+        throws IOException, InterruptedException
+    {
+        URI uri = URI.create("http://httpbin.org/get");
+
+        String expectedResponseBody = bodyAsString(uri);
+        String actualResponseBody =
+                Retrievals.retrieveResourceAsStringUsingAsyncAPI(uri).join();
+
+        assertEquals("Unexpected response body",
+                     expectedResponseBody,
+                     actualResponseBody);
+    }
+
+//    @Test
+//    public void JSONBodyAsMap() {
+//        throws IOException, InterruptedException
+//        URI uri = URI.create("http://httpbin.org/get");
+//
+//        UncheckedObjectMapper objectMapper = new UncheckedObjectMapper();
+//        String expectedResponseBody = objectMapper(bodyAsString(uri));
+//        String actualResponseBody =
+//                Retrievals.retrieveResourceAsStringUsingAsyncAPI(uri).join();
+//
+//        assertEquals("Unexpected response body",
+//                expectedResponseBody,
+//                actualResponseBody);
+//    }
+
+
+
+
+
+    //@Test
+    public void postData()
+        throws IOException, InterruptedException
+    {
+        URI uri = URI.create("http://httpbin.org/post");
+        String message = "Hello there!";
+
+        String actualResponseBody = Retrievals.postData(uri, message);
+        String expectedResponseBody = message;
+
+        assertEquals("Unexpected response body",
+                     expectedResponseBody,
+                     actualResponseBody);
+    }
+
+    /** Wrapper around Jackson's ObjectMapper that provides unchecked readValue. */
+    static class UncheckedObjectMapper extends ObjectMapper{
+
+        Map<String,String> readValue(String content) {
+            try {
+                return this.readValue(content, new TypeReference<>(){});
+            } catch (IOException ioe) {
+                throw new UncheckedIOException(ioe);
+            }
+        }
+    }
+
+    private UncheckedObjectMapper objectMapper = new UncheckedObjectMapper();
+
+
+    /**
+     * The Echo JSON service on echo.jsontest.com returns a customized
+     * JSON object that you can define through a REST-style URL. For
+     * example, calling http://echo.jsontest.com/key/value/one/two
+     * will return the following JSON:
+     *
+     *  {
+     *     “one”: “two”,
+     *     “key”: “value”
+     *  }
+     */
+    @Test
+    public void bodyAsJSON() {
+        String[] pairs = new String[] {
+           "Name", "chegar",
+           "Country", "Ireland",
+           "Citizenship", "Irish"
+        };
+        String path = Arrays.stream(pairs).collect(joining("/"));
+        URI uri = URI.create("http://echo.jsontest.com/" + path);
+
+        HttpClient client = HttpClient.newBuilder().build();
+        HttpRequest request = HttpRequest.newBuilder(uri).GET().build();
+        client.sendAsync(request, asString())
+                .thenCompose(response -> {   // maps HttpResponse to String
+                    assertEquals(response.statusCode(), 200);
+                    return CompletableFuture.completedFuture(response.body()); })
+                .thenAccept(body -> {        // consumes the response body
+                    out.println("received: " + body);
+                    Map<String, String> map = objectMapper.readValue(body);
+
+                    assertEquals(map.get("Name"), "chegar");
+                    assertEquals(map.get("Country"), "Ireland");
+                    assertEquals(map.get("Citizenship"), "Irish"); })
+              .join();
+    }
+
+
+    // ---- some trivial infrastructure to help output messages
+
+    @Rule
+    public TestRule watcher = new TestWatcher() {
+        @Override
+        protected void starting(Description description) {
+            out.println("\nStarting test: " + description.getMethodName());
+        }
+        @Override
+        protected void finished(Description description) {
+            out.println("Finished test: " + description.getMethodName());
+        }
+        @Override
+        protected void failed(Throwable e, Description description) {
+            e.printStackTrace();
+        }
+    };
+
+
+
+    // ---- demonstration code below
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+    interface Peeker<T> extends Function<T,T>
+    {
+        void peek(T t);
+
+        default T apply(T t)
+        {
+            peek(t);
+            return t;
+        }
+    }
+
+    static void assertStatusCode200(HttpResponse<?> response) {
+        assertEquals(200, response.statusCode());
+    }
+
+    private static int statusCode(URI uri) {
+        return HttpClient.newBuilder().version(HTTP_1_1).build()
+                .sendAsync(HttpRequest.newBuilder(uri).build(), discard(null))
+                .thenApply((Peeker<HttpResponse<?>>)Exercise1Test::assertStatusCode200)
+                .thenApply(HttpResponse::statusCode)
+                .join();
+    }
+
+    private static String bodyAsString(URI uri) {
+        return HttpClient.newBuilder().version(HTTP_1_1).build()
+                .sendAsync(HttpRequest.newBuilder(uri).build(), asString())
+                .thenApply((Peeker<HttpResponse<String>>)Exercise1Test::assertStatusCode200)
+                .thenApply(HttpResponse::body)
+                .join();
+    }
+
+//    private static String bodyAsString(URI uri)
+//            throws IOException, InterruptedException
+//    {
+//        HttpClient client = HttpClient.newBuilder().build();
+//        HttpRequest request = HttpRequest.newBuilder(uri)
+//                .version(HttpClient.Version.HTTP_1_1)
+//                .GET()
+//                .build();
+//        HttpResponse<String> response = client.send(request, asString());
+//
+//        Assert.assertEquals(200, response.statusCode());
+//
+//        return response.body();
+//    }
+
+    private static Path bodyAsFile(URI uri)
+        throws IOException, InterruptedException
+    {
+        HttpClient client = HttpClient.newBuilder().build();
+        HttpRequest request = HttpRequest.newBuilder(uri)
+                .version(HttpClient.Version.HTTP_1_1)
+                .GET()
+                .build();
+        Path p = Paths.get("Exercise1Test_bodyAsFile.txt");
+        HttpResponse<Path> response = client.send(request,
+                asFile(p, TRUNCATE_EXISTING, WRITE));
+
+        Assert.assertEquals(200, response.statusCode());
+
+        return response.body();
+    }
+
+    private static String postDataGetResponseBody(URI uri, String data)
+        throws IOException, InterruptedException
+    {
+        HttpClient client = HttpClient.newBuilder().build();
+        HttpRequest request = HttpRequest.newBuilder()
+                .uri(uri)
+                .version(HttpClient.Version.HTTP_1_1)
+                .POST(HttpRequest.BodyProcessor.fromString(data))
+                .build();
+        HttpResponse<String> response = client.send(request, asString());
+
+        ObjectMapper objectMapper = new ObjectMapper();
+        Map<String,Object> map = objectMapper.readValue(response.body(), new TypeReference<>(){});
+
+        System.out.println("CHEGAR map: " + map);
+
+        //JSONObject json = new JSONObject(myResponse);
+
+        Assert.assertEquals(200, response.statusCode());
+
+        return response.body();
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/test/test.iml	Tue Jan 16 19:14:34 2018 +0000
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/java" isTestSource="true" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file