New time interval after each socket write.

After each socket write operation now we are sleeping for a time interval. The default time interval is 10ms. To speed up the sending operations, use Zero as parameter but some messages may be lost (closes #2).

ApnsPHP/Abstract.php

@@ -44,6 +44,7 @@ abstract class ApnsPHP_Abstract
 
 	const DEVICE_BINARY_SIZE = 32; /**< @type integer Device token length. */
 
+	const WRITE_INTERVAL = 10000; /**< @type integer Default write interval in micro seconds. */
 	const CONNECT_RETRY_INTERVAL = 1000000; /**< @type integer Default connect retry interval in micro seconds. */
 	const SOCKET_SELECT_TIMEOUT = 1000000; /**< @type integer Default socket select timeout in micro seconds. */
 
@@ -58,6 +59,7 @@ abstract class ApnsPHP_Abstract
 	protected $_sProviderCertificatePassphrase; /**< @type string Provider certificate passphrase. */
 	protected $_sRootCertificationAuthorityFile; /**< @type string Root certification authority file. */
 
+	protected $_nWriteInterval; /**< @type integer Write interval in micro seconds. */
 	protected $_nConnectRetryInterval; /**< @type integer Connect retry interval in micro seconds. */
 	protected $_nSocketSelectTimeout; /**< @type integer Socket select timeout in micro seconds. */
 
@@ -91,6 +93,7 @@ public function __construct($nEnvironment, $sProviderCertificateFile)
 		$this->_sProviderCertificateFile = $sProviderCertificateFile;
 
 		$this->_nConnectTimeout = ini_get("default_socket_timeout");
+		$this->_nWriteInterval = self::WRITE_INTERVAL;
 		$this->_nConnectRetryInterval = self::CONNECT_RETRY_INTERVAL;
 		$this->_nSocketSelectTimeout = self::SOCKET_SELECT_TIMEOUT;
 	}
@@ -184,6 +187,30 @@ public function getCertificateAuthority()
 		return $this->_sRootCertificationAuthorityFile;
 	}
 
+	/**
+	 * Set the write interval.
+	 *
+	 * After each socket write operation we are sleeping for this 
+	 * time interval. To speed up the sending operations, use Zero
+	 * as parameter but some messages may be lost.
+	 *
+	 * @param  $nWriteInterval @type integer Write interval in micro seconds.
+	 */
+	public function setWriteInterval($nWriteInterval)
+	{
+		$this->_nWriteInterval = (int)$nWriteInterval;
+	}
+
+	/**
+	 * Get the write interval.
+	 *
+	 * @return @type integer Write interval in micro seconds.
+	 */
+	public function getWriteInterval()
+	{
+		return $this->_nWriteInterval;
+	}
+
 	/**
 	 * Set the connection timeout.
 	 *

ApnsPHP/Push.php

@@ -181,6 +181,7 @@ public function send()
 						)
 					);
 				}
+				usleep($this->_nWriteInterval);
 
 				$bError = $this->_updateQueue($aErrorMessage);
 				if ($bError) {

sample_push_many.php

@@ -40,6 +40,12 @@
 // Set the Root Certificate Autority to verify the Apple remote peer
 $push->setRootCertificationAuthority('entrust_root_certification_authority.pem');
 
+// Increase write interval to 100ms (default value is 10ms).
+// This is an example value, the 10ms default value is OK in most cases.
+// To speed up the sending operations, use Zero as parameter but
+// some messages may be lost.
+// $push->setWriteInterval(100 * 1000);
+
 // Connect to the Apple Push Notification Service
 $push->connect();