Merge pull request #1 from prashantsinalkar/master

R code search for TBC

1 files changed, 914 insertions, 0 deletions

diff --git a/Apache/Solr/Service/Balancer.php b/Apache/Solr/Service/Balancer.php
new file mode 100755
index 0000000..cad57e5
--- /dev/null
+++ b/Apache/Solr/Service/Balancer.php
@@ -0,0 +1,914 @@
+<?php
+/**
+ * Copyright (c) 2007-2011, Servigistics, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  - Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  - Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *  - Neither the name of Servigistics, Inc. nor the names of
+ *    its contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @copyright Copyright 2007-2011 Servigistics, Inc. (http://servigistics.com)
+ * @license http://solr-php-client.googlecode.com/svn/trunk/COPYING New BSD
+ * @version $Id: Balancer.php 54 2011-02-04 16:29:18Z donovan.jimenez $
+ *
+ * @package Apache
+ * @subpackage Solr
+ * @author Donovan Jimenez <djimenez@conduit-it.com>, Dan Wolfe
+ */
+
+// See Issue #1 (http://code.google.com/p/solr-php-client/issues/detail?id=1)
+// Doesn't follow typical include path conventions, but is more convenient for users
+require_once(dirname(dirname(__FILE__)) . '/Service.php');
+
+require_once(dirname(dirname(__FILE__)) . '/NoServiceAvailableException.php');
+
+/**
+ * Reference Implementation for using multiple Solr services in a distribution. Functionality
+ * includes:
+ * 	routing of read / write operations
+ * 	failover (on selection) for multiple read servers
+ */
+class Apache_Solr_Service_Balancer
+{
+	/**
+	 * SVN Revision meta data for this class
+	 */
+	const SVN_REVISION = '$Revision: 54 $';
+
+	/**
+	 * SVN ID meta data for this class
+	 */
+	const SVN_ID = '$Id: Balancer.php 54 2011-02-04 16:29:18Z donovan.jimenez $';
+
+	protected $_createDocuments = true;
+
+	protected $_readableServices = array();
+	protected $_writeableServices = array();
+
+	protected $_currentReadService = null;
+	protected $_currentWriteService = null;
+
+	protected $_readPingTimeout = 2;
+	protected $_writePingTimeout = 4;
+
+	// Configuration for server selection backoff intervals
+	protected $_useBackoff = false;		// Set to true to use more resillient write server selection
+	protected $_backoffLimit = 600;		// 10 minute default maximum
+	protected $_backoffEscalation = 2.0; 	// Rate at which to increase backoff period
+	protected $_defaultBackoff = 2.0;		// Default backoff interval
+
+	/**
+	 * Escape a value for special query characters such as ':', '(', ')', '*', '?', etc.
+	 *
+	 * NOTE: inside a phrase fewer characters need escaped, use {@link Apache_Solr_Service::escapePhrase()} instead
+	 *
+	 * @param string $value
+	 * @return string
+	 */
+	static public function escape($value)
+	{
+		return Apache_Solr_Service::escape($value);
+	}
+
+	/**
+	 * Escape a value meant to be contained in a phrase for special query characters
+	 *
+	 * @param string $value
+	 * @return string
+	 */
+	static public function escapePhrase($value)
+	{
+		return Apache_Solr_Service::escapePhrase($value);
+	}
+
+	/**
+	 * Convenience function for creating phrase syntax from a value
+	 *
+	 * @param string $value
+	 * @return string
+	 */
+	static public function phrase($value)
+	{
+		return Apache_Solr_Service::phrase($value);
+	}
+
+	/**
+	 * Constructor. Takes arrays of read and write service instances or descriptions
+	 *
+	 * @param array $readableServices
+	 * @param array $writeableServices
+	 */
+	public function __construct($readableServices = array(), $writeableServices = array())
+	{
+		//setup readable services
+		foreach ($readableServices as $service)
+		{
+			$this->addReadService($service);
+		}
+
+		//setup writeable services
+		foreach ($writeableServices as $service)
+		{
+			$this->addWriteService($service);
+		}
+	}
+
+	public function setReadPingTimeout($timeout)
+	{
+		$this->_readPingTimeout = $timeout;
+	}
+
+	public function setWritePingTimeout($timeout)
+	{
+		$this->_writePingTimeout = $timeout;
+	}
+
+	public function setUseBackoff($enable)
+	{
+		$this->_useBackoff = $enable;
+	}
+
+	/**
+	 * Generates a service ID
+	 *
+	 * @param string $host
+	 * @param integer $port
+	 * @param string $path
+	 * @return string
+	 */
+	protected function _getServiceId($host, $port, $path)
+	{
+		return $host . ':' . $port . $path;
+	}
+
+	/**
+	 * Adds a service instance or service descriptor (if it is already
+	 * not added)
+	 *
+	 * @param mixed $service
+	 *
+	 * @throws Apache_Solr_InvalidArgumentException If service descriptor is not valid
+	 */
+	public function addReadService($service)
+	{
+		if ($service instanceof Apache_Solr_Service)
+		{
+			$id = $this->_getServiceId($service->getHost(), $service->getPort(), $service->getPath());
+
+			$this->_readableServices[$id] = $service;
+		}
+		else if (is_array($service))
+		{
+			if (isset($service['host']) && isset($service['port']) && isset($service['path']))
+			{
+				$id = $this->_getServiceId((string)$service['host'], (int)$service['port'], (string)$service['path']);
+
+				$this->_readableServices[$id] = $service;
+			}
+			else
+			{
+				throw new Apache_Solr_InvalidArgumentException('A Readable Service description array does not have all required elements of host, port, and path');
+			}
+		}
+	}
+
+	/**
+	 * Removes a service instance or descriptor from the available services
+	 *
+	 * @param mixed $service
+	 *
+	 * @throws Apache_Solr_InvalidArgumentException If service descriptor is not valid
+	 */
+	public function removeReadService($service)
+	{
+		$id = '';
+
+		if ($service instanceof Apache_Solr_Service)
+		{
+			$id = $this->_getServiceId($service->getHost(), $service->getPort(), $service->getPath());
+		}
+		else if (is_array($service))
+		{
+			if (isset($service['host']) && isset($service['port']) && isset($service['path']))
+			{
+				$id = $this->_getServiceId((string)$service['host'], (int)$service['port'], (string)$service['path']);
+			}
+			else
+			{
+				throw new Apache_Solr_InvalidArgumentException('A Readable Service description array does not have all required elements of host, port, and path');
+			}
+		}
+		else if (is_string($service))
+		{
+			$id = $service;
+		}
+
+		if ($id && isset($this->_readableServices[$id]))
+		{
+			unset($this->_readableServices[$id]);
+		}
+	}
+
+	/**
+	 * Adds a service instance or service descriptor (if it is already
+	 * not added)
+	 *
+	 * @param mixed $service
+	 *
+	 * @throws Apache_Solr_InvalidArgumentException If service descriptor is not valid
+	 */
+	public function addWriteService($service)
+	{
+		if ($service instanceof Apache_Solr_Service)
+		{
+			$id = $this->_getServiceId($service->getHost(), $service->getPort(), $service->getPath());
+
+			$this->_writeableServices[$id] = $service;
+		}
+		else if (is_array($service))
+		{
+			if (isset($service['host']) && isset($service['port']) && isset($service['path']))
+			{
+				$id = $this->_getServiceId((string)$service['host'], (int)$service['port'], (string)$service['path']);
+
+				$this->_writeableServices[$id] = $service;
+			}
+			else
+			{
+				throw new Apache_Solr_InvalidArgumentException('A Writeable Service description array does not have all required elements of host, port, and path');
+			}
+		}
+	}
+
+	/**
+	 * Removes a service instance or descriptor from the available services
+	 *
+	 * @param mixed $service
+	 *
+	 * @throws Apache_Solr_InvalidArgumentException If service descriptor is not valid
+	 */
+	public function removeWriteService($service)
+	{
+		$id = '';
+
+		if ($service instanceof Apache_Solr_Service)
+		{
+			$id = $this->_getServiceId($service->getHost(), $service->getPort(), $service->getPath());
+		}
+		else if (is_array($service))
+		{
+			if (isset($service['host']) && isset($service['port']) && isset($service['path']))
+			{
+				$id = $this->_getServiceId((string)$service['host'], (int)$service['port'], (string)$service['path']);
+			}
+			else
+			{
+				throw new Apache_Solr_InvalidArgumentException('A Readable Service description array does not have all required elements of host, port, and path');
+			}
+		}
+		else if (is_string($service))
+		{
+			$id = $service;
+		}
+
+		if ($id && isset($this->_writeableServices[$id]))
+		{
+			unset($this->_writeableServices[$id]);
+		}
+	}
+
+	/**
+	 * Iterate through available read services and select the first with a ping
+	 * that satisfies configured timeout restrictions (or the default)
+	 *
+	 * @return Apache_Solr_Service
+	 *
+	 * @throws Apache_Solr_NoServiceAvailableException If there are no read services that meet requirements
+	 */
+	protected function _selectReadService($forceSelect = false)
+	{
+		if (!$this->_currentReadService || !isset($this->_readableServices[$this->_currentReadService]) || $forceSelect)
+		{
+			if ($this->_currentReadService && isset($this->_readableServices[$this->_currentReadService]) && $forceSelect)
+			{
+				// we probably had a communication error, ping the current read service, remove it if it times out
+				if ($this->_readableServices[$this->_currentReadService]->ping($this->_readPingTimeout) === false)
+				{
+					$this->removeReadService($this->_currentReadService);
+				}
+			}
+
+			if (count($this->_readableServices))
+			{
+				// select one of the read services at random
+				$ids = array_keys($this->_readableServices);
+
+				$id = $ids[rand(0, count($ids) - 1)];
+				$service = $this->_readableServices[$id];
+
+				if (is_array($service))
+				{
+					//convert the array definition to a client object
+					$service = new Apache_Solr_Service($service['host'], $service['port'], $service['path']);
+					$this->_readableServices[$id] = $service;
+				}
+
+				$service->setCreateDocuments($this->_createDocuments);
+				$this->_currentReadService = $id;
+			}
+			else
+			{
+				throw new Apache_Solr_NoServiceAvailableException('No read services were available');
+			}
+		}
+
+		return $this->_readableServices[$this->_currentReadService];
+	}
+
+	/**
+	 * Iterate through available write services and select the first with a ping
+	 * that satisfies configured timeout restrictions (or the default)
+	 *
+	 * @return Apache_Solr_Service
+	 *
+	 * @throws Apache_Solr_NoServiceAvailableException If there are no write services that meet requirements
+	 */
+	protected function _selectWriteService($forceSelect = false)
+	{
+		if($this->_useBackoff)
+		{
+			return $this->_selectWriteServiceSafe($forceSelect);
+		}
+
+		if (!$this->_currentWriteService || !isset($this->_writeableServices[$this->_currentWriteService]) || $forceSelect)
+		{
+			if ($this->_currentWriteService && isset($this->_writeableServices[$this->_currentWriteService]) && $forceSelect)
+			{
+				// we probably had a communication error, ping the current read service, remove it if it times out
+				if ($this->_writeableServices[$this->_currentWriteService]->ping($this->_writePingTimeout) === false)
+				{
+					$this->removeWriteService($this->_currentWriteService);
+				}
+			}
+
+			if (count($this->_writeableServices))
+			{
+				// select one of the read services at random
+				$ids = array_keys($this->_writeableServices);
+
+				$id = $ids[rand(0, count($ids) - 1)];
+				$service = $this->_writeableServices[$id];
+
+				if (is_array($service))
+				{
+					//convert the array definition to a client object
+					$service = new Apache_Solr_Service($service['host'], $service['port'], $service['path']);
+					$this->_writeableServices[$id] = $service;
+				}
+
+				$this->_currentWriteService = $id;
+			}
+			else
+			{
+				throw new Apache_Solr_NoServiceAvailableException('No write services were available');
+			}
+		}
+
+		return $this->_writeableServices[$this->_currentWriteService];
+	}
+
+	/**
+	 * Iterate through available write services and select the first with a ping
+	 * that satisfies configured timeout restrictions (or the default).  The
+	 * timeout period will increase until a connection is made or the limit is
+	 * reached.   This will allow for increased reliability with heavily loaded
+	 * server(s).
+	 *
+	 * @return Apache_Solr_Service
+	 *
+	 * @throws Apache_Solr_NoServiceAvailableException If there are no write services that meet requirements
+	 */
+
+	protected function _selectWriteServiceSafe($forceSelect = false)
+	{
+		if (!$this->_currentWriteService || !isset($this->_writeableServices[$this->_currentWriteService]) || $forceSelect)
+		{
+			if (count($this->_writeableServices))
+			{
+				$backoff = $this->_defaultBackoff;
+
+				do {
+					// select one of the read services at random
+					$ids = array_keys($this->_writeableServices);
+
+					$id = $ids[rand(0, count($ids) - 1)];
+					$service = $this->_writeableServices[$id];
+
+					if (is_array($service))
+					{
+						//convert the array definition to a client object
+						$service = new Apache_Solr_Service($service['host'], $service['port'], $service['path']);
+						$this->_writeableServices[$id] = $service;
+					}
+
+					$this->_currentWriteService = $id;
+
+					$backoff *= $this->_backoffEscalation;
+
+					if($backoff > $this->_backoffLimit)
+					{
+						throw new Apache_Solr_NoServiceAvailableException('No write services were available.  All timeouts exceeded.');
+					}
+
+				} while($this->_writeableServices[$this->_currentWriteService]->ping($backoff) === false);
+			}
+			else
+			{
+				throw new Apache_Solr_NoServiceAvailableException('No write services were available');
+			}
+		}
+
+		return $this->_writeableServices[$this->_currentWriteService];
+	}
+
+	/**
+	 * Set the create documents flag. This determines whether {@link Apache_Solr_Response} objects will
+	 * parse the response and create {@link Apache_Solr_Document} instances in place.
+	 *
+	 * @param boolean $createDocuments
+	 */
+	public function setCreateDocuments($createDocuments)
+	{
+		$this->_createDocuments = (bool) $createDocuments;
+
+		// set on current read service
+		if ($this->_currentReadService)
+		{
+			$service = $this->_selectReadService();
+			$service->setCreateDocuments($createDocuments);
+		}
+	}
+
+	/**
+	 * Get the current state of teh create documents flag.
+	 *
+	 * @return boolean
+	 */
+	public function getCreateDocuments()
+	{
+		return $this->_createDocuments;
+	}
+	
+	/**
+	 * Raw Add Method. Takes a raw post body and sends it to the update service.  Post body
+	 * should be a complete and well formed "add" xml document.
+	 *
+	 * @param string $rawPost
+	 * @return Apache_Solr_Response
+	 *
+	 * @throws Apache_Solr_HttpTransportException If an error occurs during the service call
+	 */
+	public function add($rawPost)
+	{
+		$service = $this->_selectWriteService();
+
+		do
+		{
+			try
+			{
+				return $service->add($rawPost);
+			}
+			catch (Apache_Solr_HttpTransportException $e)
+			{
+				if ($e->getCode() != 0) //IF NOT COMMUNICATION ERROR
+				{
+					throw $e;
+				}
+			}
+
+			$service = $this->_selectWriteService(true);
+		} while ($service);
+
+		return false;
+	}
+
+	/**
+	 * Add a Solr Document to the index
+	 *
+	 * @param Apache_Solr_Document $document
+	 * @param boolean $allowDups
+	 * @param boolean $overwritePending
+	 * @param boolean $overwriteCommitted
+	 * @return Apache_Solr_Response
+	 *
+	 * @throws Apache_Solr_HttpTransportException If an error occurs during the service call
+	 */
+	public function addDocument(Apache_Solr_Document $document, $allowDups = false, $overwritePending = true, $overwriteCommitted = true)
+	{
+		$service = $this->_selectWriteService();
+
+		do
+		{
+			try
+			{
+				return $service->addDocument($document, $allowDups, $overwritePending, $overwriteCommitted);
+			}
+			catch (Apache_Solr_HttpTransportException $e)
+			{
+				if ($e->getCode() != 0) //IF NOT COMMUNICATION ERROR
+				{
+					throw $e;
+				}
+			}
+
+			$service = $this->_selectWriteService(true);
+		} while ($service);
+
+		return false;
+	}
+
+	/**
+	 * Add an array of Solr Documents to the index all at once
+	 *
+	 * @param array $documents Should be an array of Apache_Solr_Document instances
+	 * @param boolean $allowDups
+	 * @param boolean $overwritePending
+	 * @param boolean $overwriteCommitted
+	 * @return Apache_Solr_Response
+	 *
+	 * @throws Apache_Solr_HttpTransportException If an error occurs during the service call
+	 */
+	public function addDocuments($documents, $allowDups = false, $overwritePending = true, $overwriteCommitted = true)
+	{
+		$service = $this->_selectWriteService();
+
+		do
+		{
+			try
+			{
+				return $service->addDocuments($documents, $allowDups, $overwritePending, $overwriteCommitted);
+			}
+			catch (Apache_Solr_HttpTransportException $e)
+			{
+				if ($e->getCode() != 0) //IF NOT COMMUNICATION ERROR
+				{
+					throw $e;
+				}
+			}
+
+			$service = $this->_selectWriteService(true);
+		} while ($service);
+
+		return false;
+	}
+
+	/**
+	 * Send a commit command.  Will be synchronous unless both wait parameters are set
+	 * to false.
+	 *
+	 * @param boolean $waitFlush
+	 * @param boolean $waitSearcher
+	 * @return Apache_Solr_Response
+	 *
+	 * @throws Apache_Solr_HttpTransportException If an error occurs during the service call
+	 */
+	public function commit($optimize = true, $waitFlush = true, $waitSearcher = true, $timeout = 3600)
+	{
+		$service = $this->_selectWriteService();
+
+		do
+		{
+			try
+			{
+				return $service->commit($optimize, $waitFlush, $waitSearcher, $timeout);
+			}
+			catch (Apache_Solr_HttpTransportException $e)
+			{
+				if ($e->getCode() != 0) //IF NOT COMMUNICATION ERROR
+				{
+					throw $e;
+				}
+			}
+
+			$service = $this->_selectWriteService(true);
+		} while ($service);
+
+		return false;
+	}
+
+	/**
+	 * Raw Delete Method. Takes a raw post body and sends it to the update service. Body should be
+	 * a complete and well formed "delete" xml document
+	 *
+	 * @param string $rawPost
+	 * @param float $timeout Maximum expected duration of the delete operation on the server (otherwise, will throw a communication exception)
+	 * @return Apache_Solr_Response
+	 *
+	 * @throws Apache_Solr_HttpTransportException If an error occurs during the service call
+	 */
+	public function delete($rawPost, $timeout = 3600)
+	{
+		$service = $this->_selectWriteService();
+
+		do
+		{
+			try
+			{
+				return $service->delete($rawPost, $timeout);
+			}
+			catch (Apache_Solr_HttpTransportException $e)
+			{
+				if ($e->getCode() != 0) //IF NOT COMMUNICATION ERROR
+				{
+					throw $e;
+				}
+			}
+
+			$service = $this->_selectWriteService(true);
+		} while ($service);
+
+		return false;
+	}
+
+	/**
+	 * Create a delete document based on document ID
+	 *
+	 * @param string $id
+	 * @param boolean $fromPending
+	 * @param boolean $fromCommitted
+	 * @param float $timeout Maximum expected duration of the delete operation on the server (otherwise, will throw a communication exception)
+	 * @return Apache_Solr_Response
+	 *
+	 * @throws Apache_Solr_HttpTransportException If an error occurs during the service call
+	 */
+	public function deleteById($id, $fromPending = true, $fromCommitted = true, $timeout = 3600)
+	{
+		$service = $this->_selectWriteService();
+
+		do
+		{
+			try
+			{
+				return $service->deleteById($id, $fromPending, $fromCommitted, $timeout);
+			}
+			catch (Apache_Solr_HttpTransportException $e)
+			{
+				if ($e->getCode() != 0) //IF NOT COMMUNICATION ERROR
+				{
+					throw $e;
+				}
+			}
+
+			$service = $this->_selectWriteService(true);
+		} while ($service);
+
+		return false;
+	}
+
+	/**
+	 * Create and post a delete document based on multiple document IDs.
+	 *
+	 * @param array $ids Expected to be utf-8 encoded strings
+	 * @param boolean $fromPending
+	 * @param boolean $fromCommitted
+	 * @param float $timeout Maximum expected duration of the delete operation on the server (otherwise, will throw a communication exception)
+	 * @return Apache_Solr_Response
+	 *
+	 * @throws Apache_Solr_HttpTransportException If an error occurs during the service call
+	 */
+	public function deleteByMultipleIds($ids, $fromPending = true, $fromCommitted = true, $timeout = 3600)
+	{
+		$service = $this->_selectWriteService();
+
+		do
+		{
+			try
+			{
+				return $service->deleteByMultipleId($ids, $fromPending, $fromCommitted, $timeout);
+			}
+			catch (Apache_Solr_HttpTransportException $e)
+			{
+				if ($e->getCode() != 0) //IF NOT COMMUNICATION ERROR
+				{
+					throw $e;
+				}
+			}
+
+			$service = $this->_selectWriteService(true);
+		} while ($service);
+
+		return false;
+	}
+
+	/**
+	 * Create a delete document based on a query and submit it
+	 *
+	 * @param string $rawQuery
+	 * @param boolean $fromPending
+	 * @param boolean $fromCommitted
+	 * @param float $timeout Maximum expected duration of the delete operation on the server (otherwise, will throw a communication exception)
+	 * @return Apache_Solr_Response
+	 *
+	 * @throws Apache_Solr_HttpTransportException If an error occurs during the service call
+	 */
+	public function deleteByQuery($rawQuery, $fromPending = true, $fromCommitted = true, $timeout = 3600)
+	{
+		$service = $this->_selectWriteService();
+
+		do
+		{
+			try
+			{
+				return $service->deleteByQuery($rawQuery, $fromPending, $fromCommitted, $timeout);
+			}
+			catch (Apache_Solr_HttpTransportException $e)
+			{
+				if ($e->getCode() != 0) //IF NOT COMMUNICATION ERROR
+				{
+					throw $e;
+				}
+			}
+
+			$service = $this->_selectWriteService(true);
+		} while ($service);
+
+		return false;
+	}
+	
+	/**
+	 * Use Solr Cell to extract document contents. See {@link http://wiki.apache.org/solr/ExtractingRequestHandler} for information on how
+	 * to use Solr Cell and what parameters are available.
+	 *
+	 * NOTE: when passing an Apache_Solr_Document instance, field names and boosts will automatically be prepended by "literal." and "boost."
+	 * as appropriate. Any keys from the $params array will NOT be treated this way. Any mappings from the document will overwrite key / value
+	 * pairs in the params array if they have the same name (e.g. you pass a "literal.id" key and value in your $params array but you also
+	 * pass in a document isntance with an "id" field" - the document's value(s) will take precedence).
+	 *
+	 * @param string $file Path to file to extract data from
+	 * @param array $params optional array of key value pairs that will be sent with the post (see Solr Cell documentation)
+	 * @param Apache_Solr_Document $document optional document that will be used to generate post parameters (literal.* and boost.* params)
+	 * @param string $mimetype optional mimetype specification (for the file being extracted)
+	 *
+	 * @return Apache_Solr_Response
+	 *
+	 * @throws Apache_Solr_InvalidArgumentException if $file, $params, or $document are invalid.
+	 */
+	public function extract($file, $params = array(), $document = null, $mimetype = 'application/octet-stream')
+	{
+		$service = $this->_selectWriteService();
+
+		do
+		{
+			try
+			{
+				return $service->extract($file, $params, $document, $mimetype);
+			}
+			catch (Apache_Solr_HttpTransportException $e)
+			{
+				if ($e->getCode() != 0) //IF NOT COMMUNICATION ERROR
+				{
+					throw $e;
+				}
+			}
+
+			$service = $this->_selectWriteService(true);
+		} while ($service);
+
+		return false;
+	}
+	
+	/**
+	 * Use Solr Cell to extract document contents. See {@link http://wiki.apache.org/solr/ExtractingRequestHandler} for information on how
+	 * to use Solr Cell and what parameters are available.
+	 *
+	 * NOTE: when passing an Apache_Solr_Document instance, field names and boosts will automatically be prepended by "literal." and "boost."
+	 * as appropriate. Any keys from the $params array will NOT be treated this way. Any mappings from the document will overwrite key / value
+	 * pairs in the params array if they have the same name (e.g. you pass a "literal.id" key and value in your $params array but you also
+	 * pass in a document isntance with an "id" field" - the document's value(s) will take precedence).
+	 *
+	 * @param string $data Data that will be passed to Solr Cell
+	 * @param array $params optional array of key value pairs that will be sent with the post (see Solr Cell documentation)
+	 * @param Apache_Solr_Document $document optional document that will be used to generate post parameters (literal.* and boost.* params)
+	 * @param string $mimetype optional mimetype specification (for the file being extracted)
+	 *
+	 * @return Apache_Solr_Response
+	 *
+	 * @throws Apache_Solr_InvalidArgumentException if $file, $params, or $document are invalid.
+	 *
+	 * @todo Should be using multipart/form-data to post parameter values, but I could not get my implementation to work. Needs revisisted.
+	 */
+	public function extractFromString($data, $params = array(), $document = null, $mimetype = 'application/octet-stream')
+	{
+		$service = $this->_selectWriteService();
+
+		do
+		{
+			try
+			{
+				return $service->extractFromString($data, $params, $document, $mimetype);
+			}
+			catch (Apache_Solr_HttpTransportException $e)
+			{
+				if ($e->getCode() != 0) //IF NOT COMMUNICATION ERROR
+				{
+					throw $e;
+				}
+			}
+
+			$service = $this->_selectWriteService(true);
+		} while ($service);
+
+		return false;
+	}
+	
+	/**
+	 * Send an optimize command.  Will be synchronous unless both wait parameters are set
+	 * to false.
+	 *
+	 * @param boolean $waitFlush
+	 * @param boolean $waitSearcher
+	 * @param float $timeout Maximum expected duration of the optimize operation on the server (otherwise, will throw a communication exception)
+	 * @return Apache_Solr_Response
+	 *
+	 * @throws Apache_Solr_HttpTransportException If an error occurs during the service call
+	 */
+	public function optimize($waitFlush = true, $waitSearcher = true, $timeout = 3600)
+	{
+		$service = $this->_selectWriteService();
+
+		do
+		{
+			try
+			{
+				return $service->optimize($waitFlush, $waitSearcher, $timeout);
+			}
+			catch (Apache_Solr_HttpTransportException $e)
+			{
+				if ($e->getCode() != 0) //IF NOT COMMUNICATION ERROR
+				{
+					throw $e;
+				}
+			}
+
+			$service = $this->_selectWriteService(true);
+		} while ($service);
+
+		return false;
+	}
+
+	/**
+	 * Simple Search interface
+	 *
+	 * @param string $query The raw query string
+	 * @param int $offset The starting offset for result documents
+	 * @param int $limit The maximum number of result documents to return
+	 * @param array $params key / value pairs for query parameters, use arrays for multivalued parameters
+	 * @param string $method The HTTP method (Apache_Solr_Service::METHOD_GET or Apache_Solr_Service::METHOD::POST)
+	 * @return Apache_Solr_Response
+	 *
+	 * @throws Apache_Solr_HttpTransportException If an error occurs during the service call
+	 */
+	public function search($query, $offset = 0, $limit = 10, $params = array(), $method = Apache_Solr_Service::METHOD_GET)
+	{
+		$service = $this->_selectReadService();
+
+		do
+		{
+			try
+			{
+				return $service->search($query, $offset, $limit, $params, $method);
+			}
+			catch (Apache_Solr_HttpTransportException $e)
+			{
+				if ($e->getCode() != 0) //IF NOT COMMUNICATION ERROR
+				{
+					throw $e;
+				}
+			}
+
+			$service = $this->_selectReadService(true);
+		} while ($service);
+
+		return false;
+	}
+}