add example fixture

plugins/jvm-example/example-fixture/build.gradle

@@ -0,0 +1,20 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you 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.
+ */
+
+apply plugin: 'java'

plugins/jvm-example/example-fixture/src/main/java/example/ExampleTestFixture.java

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+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you 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 example;
+
+import java.net.Inet6Address;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.nio.ByteBuffer;
+import java.nio.channels.AsynchronousServerSocketChannel;
+import java.nio.channels.AsynchronousSocketChannel;
+import java.nio.channels.CompletionHandler;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardCopyOption;
+import java.util.Collections;
+
+/** Crappy example test fixture that responds with TEST and closes the connection */
+public class ExampleTestFixture {
+    public static void main(String args[]) throws Exception {
+        if (args.length != 1) {
+            throw new IllegalArgumentException("ExampleTestFixture <portFile>");
+        }
+        AsynchronousServerSocketChannel server = AsynchronousServerSocketChannel
+                .open()
+                .bind(new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));
+        // write port file
+        Path tmp = Files.createTempFile(null, null);
+        InetSocketAddress bound = (InetSocketAddress) server.getLocalAddress();
+        if (bound.getAddress() instanceof Inet6Address) {
+            Files.write(tmp, Collections.singleton("[" + bound.getHostString() + "]:" + bound.getPort()));
+        } else {
+            Files.write(tmp, Collections.singleton(bound.getHostString() + ":" + bound.getPort()));
+        }
+        Files.move(tmp, Paths.get(args[0]), StandardCopyOption.ATOMIC_MOVE);
+        // go time
+        server.accept(null, new CompletionHandler<AsynchronousSocketChannel,Void>() {
+            @Override
+            public void completed(AsynchronousSocketChannel socket, Void attachment) {
+                server.accept(null, this);
+                try (AsynchronousSocketChannel ch = socket) {
+                    ch.write(ByteBuffer.wrap("TEST\n".getBytes(StandardCharsets.UTF_8))).get();
+                } catch (Exception e) {
+                    throw new RuntimeException(e);
+                }
+            }
+
+            @Override
+            public void failed(Throwable exc, Void attachment) {}
+        });
+        // wait forever, until you kill me
+        Thread.sleep(Long.MAX_VALUE);
+    }
+}