THRIFT-5545: use gradle convention in organizing java project

Client: java
Patch: Jiayu Liu

This closes #2546

1 files changed, 171 insertions, 0 deletions

diff --git a/lib/java/src/main/java/org/apache/thrift/server/TExtensibleServlet.java b/lib/java/src/main/java/org/apache/thrift/server/TExtensibleServlet.java
new file mode 100644
index 000000000..75082c0f7
--- /dev/null
+++ b/lib/java/src/main/java/org/apache/thrift/server/TExtensibleServlet.java
@@ -0,0 +1,171 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF 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 org.apache.thrift.server;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Map;
+
+import javax.servlet.ServletConfig;
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.thrift.TException;
+import org.apache.thrift.TProcessor;
+import org.apache.thrift.protocol.TProtocol;
+import org.apache.thrift.protocol.TProtocolFactory;
+import org.apache.thrift.transport.TIOStreamTransport;
+import org.apache.thrift.transport.TTransport;
+
+/**
+ * Servlet implementation class ThriftServer, that allows {@link TProcessor} and
+ * {@link TProtocolFactory} to be supplied after the {@link #init()} method has
+ * finished. <br>
+ * Subclasses must implement the abstract methods that return the TProcessor and
+ * two TProtocolFactory. Those methods are guaranteed to be called exactly once,
+ * and that {@link ServletContext} is available.
+ */
+public abstract class TExtensibleServlet extends HttpServlet {
+  private static final long serialVersionUID = 1L;
+
+  private TProcessor processor;
+
+  private TProtocolFactory inFactory;
+
+  private TProtocolFactory outFactory;
+
+  private Collection<Map.Entry<String, String>> customHeaders;
+
+  /**
+   * Returns the appropriate {@link TProcessor}. This will be called <b>once</b> just
+   * after the {@link #init()} method
+   * 
+   * @return the appropriate {@link TProcessor}
+   */
+  protected abstract TProcessor getProcessor();
+
+  /**
+   * Returns the appropriate in {@link TProtocolFactory}. This will be called
+   * <b>once</b> just after the {@link #init()} method
+   * 
+   * @return the appropriate in {@link TProtocolFactory}
+   */
+  protected abstract TProtocolFactory getInProtocolFactory();
+
+  /**
+   * Returns the appropriate out {@link TProtocolFactory}. This will be called
+   * <b>once</b> just after the {@link #init()} method
+   * 
+   * @return the appropriate out {@link TProtocolFactory}
+   */
+  protected abstract TProtocolFactory getOutProtocolFactory();
+
+  @Override
+  public final void init(ServletConfig config) throws ServletException {
+    super.init(config); //no-args init() happens here
+    this.processor = getProcessor();
+    this.inFactory = getInProtocolFactory();
+    this.outFactory = getOutProtocolFactory();
+    this.customHeaders = new ArrayList<Map.Entry<String, String>>();
+
+    if (processor == null) {
+      throw new ServletException("processor must be set");
+    }
+    if (inFactory == null) {
+      throw new ServletException("inFactory must be set");
+    }
+    if (outFactory == null) {
+      throw new ServletException("outFactory must be set");
+    }
+  }
+
+  /**
+   * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
+   *      response)
+   */
+  @Override
+  protected void doPost(HttpServletRequest request, HttpServletResponse response)
+      throws ServletException, IOException {
+    TTransport inTransport = null;
+    TTransport outTransport = null;
+
+    try {
+      response.setContentType("application/x-thrift");
+
+      if (null != this.customHeaders) {
+	for (Map.Entry<String, String> header : this.customHeaders) {
+	  response.addHeader(header.getKey(), header.getValue());
+	}
+      }
+
+      InputStream in = request.getInputStream();
+      OutputStream out = response.getOutputStream();
+
+      TTransport transport = new TIOStreamTransport(in, out);
+      inTransport = transport;
+      outTransport = transport;
+
+      TProtocol inProtocol = inFactory.getProtocol(inTransport);
+      TProtocol outProtocol = inFactory.getProtocol(outTransport);
+
+      processor.process(inProtocol, outProtocol);
+      out.flush();
+    } catch (TException te) {
+      throw new ServletException(te);
+    }
+  }
+
+  /**
+   * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
+   *      response)
+   */
+  @Override
+  protected void doGet(HttpServletRequest req, HttpServletResponse resp)
+      throws ServletException, IOException {
+    doPost(req, resp);
+  }
+
+  public void addCustomHeader(final String key, final String value) {
+    this.customHeaders.add(new Map.Entry<String, String>() {
+      public String getKey() {
+	return key;
+      }
+
+      public String getValue() {
+	return value;
+      }
+
+      public String setValue(String value) {
+	return null;
+      }
+    });
+  }
+
+  public void setCustomHeaders(Collection<Map.Entry<String, String>> headers) {
+    this.customHeaders.clear();
+    this.customHeaders.addAll(headers);
+  }
+}