use cached thread pool to process mercurial process error streams

scm-webapp/src/main/java/sonia/scm/web/cgi/DefaultCGIExecutor.java

@@ -58,6 +58,7 @@ import java.io.OutputStream;
 
 import java.util.Enumeration;
 import java.util.Map;
+import java.util.concurrent.ExecutorService;
 
 import javax.servlet.ServletContext;
 import javax.servlet.ServletInputStream;
@@ -94,15 +95,17 @@ public class DefaultCGIExecutor extends AbstractCGIExecutor
    * Constructs ...
    *
    *
+   * @param executor to handle error stream processing
    * @param configuration
    * @param context
    * @param request
    * @param response
    */
-  public DefaultCGIExecutor(ScmConfiguration configuration,
-    ServletContext context, HttpServletRequest request,
-    HttpServletResponse response)
+  public DefaultCGIExecutor(ExecutorService executor,
+    ScmConfiguration configuration, ServletContext context,
+    HttpServletRequest request, HttpServletResponse response)
   {
+    this.executor = executor;
     this.configuration = configuration;
     this.context = context;
     this.request = request;
@@ -507,7 +510,7 @@ public class DefaultCGIExecutor extends AbstractCGIExecutor
    */
   private void processErrorStreamAsync(final Process process)
   {
-    new Thread(new Runnable()
+    executor.execute(new Runnable()
     {
       @Override
       public void run()
@@ -528,7 +531,7 @@ public class DefaultCGIExecutor extends AbstractCGIExecutor
           IOUtil.close(errorStream);
         }
       }
-    }).start();
+    });
   }
 
   /**
@@ -539,6 +542,8 @@ public class DefaultCGIExecutor extends AbstractCGIExecutor
    */
   private void processServletInput(Process process)
   {
+    logger.trace("process servlet input");
+
     OutputStream processOS = null;
     ServletInputStream servletIS = null;
 
@@ -637,6 +642,9 @@ public class DefaultCGIExecutor extends AbstractCGIExecutor
 
   //~--- fields ---------------------------------------------------------------
 
+  /** executor to handle error stream processing */
+  private final ExecutorService executor;
+
   /** Field description */
   private ScmConfiguration configuration;
 

scm-webapp/src/main/java/sonia/scm/web/cgi/DefaultCGIExecutorFactory.java

@@ -35,10 +35,15 @@ package sonia.scm.web.cgi;
 
 //~--- non-JDK imports --------------------------------------------------------
 
+import com.google.common.util.concurrent.ThreadFactoryBuilder;
+
 import sonia.scm.config.ScmConfiguration;
 
 //~--- JDK imports ------------------------------------------------------------
 
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
 import javax.servlet.ServletContext;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
@@ -50,6 +55,21 @@ import javax.servlet.http.HttpServletResponse;
 public class DefaultCGIExecutorFactory implements CGIExecutorFactory
 {
 
+  /**
+   * Constructs ...
+   *
+   */
+  public DefaultCGIExecutorFactory()
+  {
+    //J-
+    this.executor = Executors.newCachedThreadPool(
+      new ThreadFactoryBuilder().setNameFormat("cgi-pool-%d").build()
+    );
+    //J+
+  }
+
+  //~--- methods --------------------------------------------------------------
+
   /**
    * Method description
    *
@@ -63,10 +83,15 @@ public class DefaultCGIExecutorFactory implements CGIExecutorFactory
    */
   @Override
   public CGIExecutor createExecutor(ScmConfiguration configuration,
-                                    ServletContext context,
-                                    HttpServletRequest request,
-                                    HttpServletResponse response)
+    ServletContext context, HttpServletRequest request,
+    HttpServletResponse response)
   {
-    return new DefaultCGIExecutor(configuration, context, request, response);
+    return new DefaultCGIExecutor(executor, configuration, context, request,
+      response);
   }
+
+  //~--- fields ---------------------------------------------------------------
+
+  /** Field description */
+  private final ExecutorService executor;
 }