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includes/Log-1.9.9/Log/composite.php

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+<?php
+/**
+ * $Header: /repository/pear/Log/Log/composite.php,v 1.28 2006/06/29 07:12:34 jon Exp $
+ * $Horde: horde/lib/Log/composite.php,v 1.2 2000/06/28 21:36:13 jon Exp $
+ *
+ * @version $Revision: 1.28 $
+ * @package Log
+ */
+
+/**
+ * The Log_composite:: class implements a Composite pattern which
+ * allows multiple Log implementations to receive the same events.
+ *
+ * @author  Chuck Hagenbuch <[email protected]>
+ * @author  Jon Parise <[email protected]>
+ *
+ * @since Horde 1.3
+ * @since Log 1.0
+ * @package Log
+ *
+ * @example composite.php   Using the composite handler.
+ */
+class Log_composite extends Log
+{
+    /**
+     * Array holding all of the Log instances to which log events should be
+     * sent.
+     *
+     * @var array
+     * @access private
+     */
+    var $_children = array();
+
+
+    /**
+     * Constructs a new composite Log object.
+     *
+     * @param boolean   $name       This parameter is ignored.
+     * @param boolean   $ident      This parameter is ignored.
+     * @param boolean   $conf       This parameter is ignored.
+     * @param boolean   $level      This parameter is ignored.
+     *
+     * @access public
+     */
+    function Log_composite($name, $ident = '', $conf = array(),
+                           $level = PEAR_LOG_DEBUG)
+    {
+        $this->_ident = $ident;
+    }
+
+    /**
+     * Opens all of the child instances.
+     *
+     * @return  True if all of the child instances were successfully opened.
+     *
+     * @access public
+     */
+    function open()
+    {
+        /* Attempt to open each of our children. */
+        $this->_opened = true;
+        foreach ($this->_children as $id => $child) {
+            $this->_opened &= $this->_children[$id]->open();
+        }
+
+        /* If all children were opened, return success. */
+        return $this->_opened;
+    }
+
+    /**
+     * Closes all of the child instances.
+     *
+     * @return  True if all of the child instances were successfully closed.
+     *
+     * @access public
+     */
+    function close()
+    {
+        /* Attempt to close each of our children. */
+        $closed = true;
+        foreach ($this->_children as $id => $child) {
+            $closed &= $this->_children[$id]->close();
+        }
+
+        /* Track the _opened state for consistency. */
+        $this->_opened = false;
+
+        /* If all children were closed, return success. */
+        return $closed;
+    }
+
+    /**
+     * Flushes all child instances.  It is assumed that all of the children
+     * have been successfully opened.
+     *
+     * @return  True if all of the child instances were successfully flushed.
+     *
+     * @access public
+     * @since Log 1.8.2
+     */
+    function flush()
+    {
+        /* Attempt to flush each of our children. */
+        $flushed = true;
+        foreach ($this->_children as $id => $child) {
+            $flushed &= $this->_children[$id]->flush();
+        }
+
+        /* If all children were flushed, return success. */
+        return $flushed;
+    }
+
+    /**
+     * Sends $message and $priority to each child of this composite.  If the
+     * children aren't already open, they will be opened here.
+     *
+     * @param mixed     $message    String or object containing the message
+     *                              to log.
+     * @param string    $priority   (optional) The priority of the message.
+     *                              Valid values are: PEAR_LOG_EMERG,
+     *                              PEAR_LOG_ALERT, PEAR_LOG_CRIT,
+     *                              PEAR_LOG_ERR, PEAR_LOG_WARNING,
+     *                              PEAR_LOG_NOTICE, PEAR_LOG_INFO, and
+     *                              PEAR_LOG_DEBUG.
+     *
+     * @return boolean  True if the entry is successfully logged.
+     *
+     * @access public
+     */
+    function log($message, $priority = null)
+    {
+        /* If a priority hasn't been specified, use the default value. */
+        if ($priority === null) {
+            $priority = $this->_priority;
+        }
+
+        /*
+         * If the handlers haven't been opened, attempt to open them now.
+         * However, we don't treat failure to open all of the handlers as a
+         * fatal error.  We defer that consideration to the success of calling
+         * each handler's log() method below.
+         */
+        if (!$this->_opened) {
+            $this->open();
+        }
+
+        /* Attempt to log the event using each of the children. */
+        $success = true;
+        foreach ($this->_children as $id => $child) {
+            $success &= $this->_children[$id]->log($message, $priority);
+        }
+
+        $this->_announce(array('priority' => $priority, 'message' => $message));
+
+        /* Return success if all of the children logged the event. */
+        return $success;
+    }
+
+    /**
+     * Returns true if this is a composite.
+     *
+     * @return boolean  True if this is a composite class.
+     *
+     * @access public
+     */
+    function isComposite()
+    {
+        return true;
+    }
+
+    /**
+     * Sets this identification string for all of this composite's children.
+     *
+     * @param string    $ident      The new identification string.
+     *
+     * @access public
+     * @since  Log 1.6.7
+     */
+    function setIdent($ident)
+    {
+        /* Call our base class's setIdent() method. */
+        parent::setIdent($ident);
+
+        /* ... and then call setIdent() on all of our children. */
+        foreach ($this->_children as $id => $child) {
+            $this->_children[$id]->setIdent($ident);
+        }
+    }
+
+    /**
+     * Adds a Log instance to the list of children.
+     *
+     * @param object    $child      The Log instance to add.
+     *
+     * @return boolean  True if the Log instance was successfully added.
+     *
+     * @access public
+     */
+    function addChild(&$child)
+    {
+        /* Make sure this is a Log instance. */
+        if (!is_a($child, 'Log')) {
+            return false;
+        }
+
+        $this->_children[$child->_id] = &$child;
+
+        return true;
+    }
+
+    /**
+     * Removes a Log instance from the list of children.
+     *
+     * @param object    $child      The Log instance to remove.
+     *
+     * @return boolean  True if the Log instance was successfully removed.
+     *
+     * @access public
+     */
+    function removeChild($child)
+    {
+        if (!is_a($child, 'Log') || !isset($this->_children[$child->_id])) {
+            return false;
+        }
+
+        unset($this->_children[$child->_id]);
+
+        return true;
+    }
+
+}