Moved cache drivers outside core to extensions (plugins)

plugins/cache-redis/Predis/Pipeline/ConnectionErrorProof.php

@@ -0,0 +1,130 @@
+<?php
+
+/*
+ * This file is part of the Predis package.
+ *
+ * (c) Daniele Alessandri <suppakilla@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Predis\Pipeline;
+
+use Predis\CommunicationException;
+use Predis\Connection\Aggregate\ClusterInterface;
+use Predis\Connection\ConnectionInterface;
+use Predis\Connection\NodeConnectionInterface;
+use Predis\NotSupportedException;
+
+/**
+ * Command pipeline that does not throw exceptions on connection errors, but
+ * returns the exception instances as the rest of the response elements.
+ *
+ * @todo Awful naming!
+ *
+ * @author Daniele Alessandri <suppakilla@gmail.com>
+ */
+class ConnectionErrorProof extends Pipeline
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function getConnection()
+    {
+        return $this->getClient()->getConnection();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function executePipeline(ConnectionInterface $connection, \SplQueue $commands)
+    {
+        if ($connection instanceof NodeConnectionInterface) {
+            return $this->executeSingleNode($connection, $commands);
+        } elseif ($connection instanceof ClusterInterface) {
+            return $this->executeCluster($connection, $commands);
+        } else {
+            $class = get_class($connection);
+
+            throw new NotSupportedException("The connection class '$class' is not supported.");
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function executeSingleNode(NodeConnectionInterface $connection, \SplQueue $commands)
+    {
+        $responses = array();
+        $sizeOfPipe = count($commands);
+
+        foreach ($commands as $command) {
+            try {
+                $connection->writeRequest($command);
+            } catch (CommunicationException $exception) {
+                return array_fill(0, $sizeOfPipe, $exception);
+            }
+        }
+
+        for ($i = 0; $i < $sizeOfPipe; ++$i) {
+            $command = $commands->dequeue();
+
+            try {
+                $responses[$i] = $connection->readResponse($command);
+            } catch (CommunicationException $exception) {
+                $add = count($commands) - count($responses);
+                $responses = array_merge($responses, array_fill(0, $add, $exception));
+
+                break;
+            }
+        }
+
+        return $responses;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function executeCluster(ClusterInterface $connection, \SplQueue $commands)
+    {
+        $responses = array();
+        $sizeOfPipe = count($commands);
+        $exceptions = array();
+
+        foreach ($commands as $command) {
+            $cmdConnection = $connection->getConnection($command);
+
+            if (isset($exceptions[spl_object_hash($cmdConnection)])) {
+                continue;
+            }
+
+            try {
+                $cmdConnection->writeRequest($command);
+            } catch (CommunicationException $exception) {
+                $exceptions[spl_object_hash($cmdConnection)] = $exception;
+            }
+        }
+
+        for ($i = 0; $i < $sizeOfPipe; ++$i) {
+            $command = $commands->dequeue();
+
+            $cmdConnection = $connection->getConnection($command);
+            $connectionHash = spl_object_hash($cmdConnection);
+
+            if (isset($exceptions[$connectionHash])) {
+                $responses[$i] = $exceptions[$connectionHash];
+                continue;
+            }
+
+            try {
+                $responses[$i] = $cmdConnection->readResponse($command);
+            } catch (CommunicationException $exception) {
+                $responses[$i] = $exception;
+                $exceptions[$connectionHash] = $exception;
+            }
+        }
+
+        return $responses;
+    }
+}