从GAE Java代码而不是Maven运行Dataflow pipeline的方法是通过使用Google Cloud Dataflow SDK for Java。以下是详细步骤:
<dependency>
<groupId>com.google.cloud.dataflow</groupId>
<artifactId>google-cloud-dataflow-java-sdk-all</artifactId>
<version>2.5.0</version>
</dependency>
import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.io.TextIO;
import org.apache.beam.sdk.options.PipelineOptions;
import org.apache.beam.sdk.options.PipelineOptionsFactory;
import org.apache.beam.sdk.transforms.Count;
import org.apache.beam.sdk.transforms.DoFn;
import org.apache.beam.sdk.transforms.ParDo;
public class DataflowPipeline {
public static void main(String[] args) {
PipelineOptions options = PipelineOptionsFactory.create();
Pipeline pipeline = Pipeline.create(options);
pipeline
.apply(TextIO.read().from("gs://bucket/input.txt"))
.apply(ParDo.of(new CountWords()))
.apply(Count.perElement())
.apply(ParDo.of(new FormatResult()))
.apply(TextIO.write().to("gs://bucket/output.txt"));
pipeline.run();
}
public static class CountWords extends DoFn<String, String> {
@ProcessElement
public void processElement(ProcessContext c) {
String[] words = c.element().split(" ");
for (String word : words) {
c.output(word);
}
}
}
public static class FormatResult extends DoFn<KV<String, Long>, String> {
@ProcessElement
public void processElement(ProcessContext c) {
String result = c.element().getKey() + ": " + c.element().getValue();
c.output(result);
}
}
}
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.beam.sdk.PipelineResult;
@WebServlet("/rundataflow")
public class RunDataflowServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) {
PipelineResult result = DataflowPipeline.main(new String[]{});
// 处理Dataflow pipline的结果
}
}
/rundataflow
路径来触发Dataflow pipline的运行。这样,就可以从GAE Java代码而不是Maven运行Dataflow pipline了。请注意,以上示例仅用于演示目的,实际应用中需要根据具体需求进行适当的修改和配置。
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