ianmcook commented on code in PR #39081:
URL: https://github.com/apache/arrow/pull/39081#discussion_r1433352897
##########
http/examples/get/client.java:
##########
@@ -0,0 +1,53 @@
+import org.apache.arrow.memory.BufferAllocator;
+import org.apache.arrow.memory.RootAllocator;
+import org.apache.arrow.vector.VectorSchemaRoot;
+import org.apache.arrow.vector.VectorUnloader;
+import org.apache.arrow.vector.ipc.ArrowStreamReader;
+import org.apache.arrow.vector.ipc.message.ArrowRecordBatch;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.util.List;
+import java.util.ArrayList;
+
+public class ArrowHttpClient {
+
+ public static void main(String[] args) {
+ String serverUrl = "http://localhost:8000";;
+
+ try {
+ URL url = new URL(serverUrl);
+ HttpURLConnection connection = (HttpURLConnection)
url.openConnection();
+ connection.setRequestMethod("GET");
+
+ if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
+ InputStream inputStream = connection.getInputStream();
+
+ BufferAllocator allocator = new RootAllocator(Long.MAX_VALUE);
+ ArrowStreamReader reader = new ArrowStreamReader(inputStream,
allocator);
+ List<ArrowRecordBatch> batches = new ArrayList<>();
+
+ int num_rows = 0;
+ while (reader.loadNextBatch()) {
+ VectorSchemaRoot root = reader.getVectorSchemaRoot();
+ num_rows += root.getRowCount();
+ VectorUnloader unloader = new VectorUnloader(root);
+ ArrowRecordBatch arb = unloader.getRecordBatch();
+ batches.add(arb);
+ }
+
+ System.out.println(reader.bytesRead() + " bytes received");
+ System.out.println(num_rows + " records received");
+ System.out.println(batches.size() + " record batches
received");
+
+ reader.close();
+ } else {
+ System.err.println("Failed with response code: " +
connection.getResponseCode());
+ }
+ } catch (IOException e) {
+ e.printStackTrace();
+ }
+ }
+}
Review Comment:
To run:
Create `pom.xml` with this contents:
```xml
<?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>com.example</groupId>
<artifactId>ArrowHttpClient</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<arrow.version>14.0.1</arrow.version>
<maven.compiler.source>21</maven.compiler.source>
<maven.compiler.target>21</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.arrow</groupId>
<artifactId>arrow-memory-core</artifactId>
<version>${arrow.version}</version>
</dependency>
<dependency>
<groupId>org.apache.arrow</groupId>
<artifactId>arrow-memory-netty</artifactId>
<version>${arrow.version}</version>
</dependency>
<dependency>
<groupId>org.apache.arrow</groupId>
<artifactId>arrow-vector</artifactId>
<version>${arrow.version}</version>
</dependency>
</dependencies>
</project>
```
Move `client.java` to `src/main/java/com/example/ArrowHttpClient.java`
Then:
```sh
mvn install
mvn compile
_JAVA_OPTIONS="--add-opens=java.base/java.nio=ALL-UNNAMED" mvn exec:java
-Dexec.mainClass="ArrowHttpClient"
```
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