From be62fcca7f9c658f1abd52cb5371a9768a9e0907 Mon Sep 17 00:00:00 2001
From: boombatower <jimmy@boombatower.com>
Date: Fri, 7 Sep 2012 00:03:48 -0700
Subject: [PATCH] [process] provide a restart method.

---
 src/Symfony/Component/Process/Process.php     | 38 +++++++++++++++++++
 .../Component/Process/Tests/ProcessTest.php   | 18 +++++++++
 2 files changed, 56 insertions(+)

diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
index cd1e8b42155a..e4b4640074a8 100644
--- a/src/Symfony/Component/Process/Process.php
+++ b/src/Symfony/Component/Process/Process.php
@@ -143,6 +143,20 @@ public function __destruct()
         $this->stop();
     }
 
+    public function __clone()
+    {
+        $this->exitcode = null;
+        $this->fallbackExitcode = null;
+        $this->processInformation = null;
+        $this->stdout = null;
+        $this->stderr = null;
+        $this->pipes = null;
+        $this->process = null;
+        $this->status = self::STATUS_READY;
+        $this->fileHandles = null;
+        $this->readBytes = null;
+    }
+
     /**
      * Runs the process.
      *
@@ -300,6 +314,30 @@ public function start($callback = null)
         $this->updateStatus();
     }
 
+    /**
+     * Restarts the process by cloning and invoking start().
+     *
+     * @param callable $callback A PHP callback to run whenever there is some
+     *                           output available on STDOUT or STDERR
+     *
+     * @return Process The new process.
+     *
+     * @throws \RuntimeException When process can't be launch or is stopped
+     * @throws \RuntimeException When process is already running
+     * @see start()
+     */
+    public function restart($callback = null)
+    {
+        if ($this->isRunning()) {
+            throw new \RuntimeException('Process is already running');
+        }
+
+        $process = clone $this;
+        $process->start($callback);
+
+        return $process;
+    }
+
     /**
      * Waits for the process to terminate.
      *
diff --git a/src/Symfony/Component/Process/Tests/ProcessTest.php b/src/Symfony/Component/Process/Tests/ProcessTest.php
index 64f929cc20d6..5548cb7a696d 100644
--- a/src/Symfony/Component/Process/Tests/ProcessTest.php
+++ b/src/Symfony/Component/Process/Tests/ProcessTest.php
@@ -155,6 +155,24 @@ public function testStop()
         }
     }
 
+    public function testRestart()
+    {
+      $process1 = new Process('php -r "echo getmypid();"');
+      $process1->run();
+      $process2 = $process1->restart();
+
+      usleep(300000); // wait for output
+
+      // Ensure that both processed finished and the output is numeric
+      $this->assertFalse($process1->isRunning());
+      $this->assertFalse($process2->isRunning());
+      $this->assertTrue(is_numeric($process1->getOutput()));
+      $this->assertTrue(is_numeric($process2->getOutput()));
+
+      // Ensure that restart returned a new process by check that the output is different
+      $this->assertNotEquals($process1->getOutput(), $process2->getOutput());
+    }
+
     public function testPhpDeadlock()
     {
         $this->markTestSkipped('Can course php to hang');