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msd2/tracking/piwik/plugins/Actions/Columns/Metrics/AveragePageGenerationTime.php

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+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ */
+namespace Piwik\Plugins\Actions\Columns\Metrics;
+
+use Piwik\DataTable;
+use Piwik\DataTable\Row;
+use Piwik\Metrics;
+use Piwik\Metrics\Formatter;
+use Piwik\Piwik;
+use Piwik\Plugin\ProcessedMetric;
+
+/**
+ * The average amount of time it takes to generate a page. Calculated as
+ *
+ *     sum_time_generation / nb_hits_with_time_generation
+ *
+ * The above metrics are calculated during archiving. This metric is calculated before
+ * serving a report.
+ */
+class AveragePageGenerationTime extends ProcessedMetric
+{
+    public function getName()
+    {
+        return 'avg_time_generation';
+    }
+
+    public function getTranslatedName()
+    {
+        return Piwik::translate('General_ColumnAverageGenerationTime');
+    }
+
+    public function getDependentMetrics()
+    {
+        return array('sum_time_generation', 'nb_hits_with_time_generation');
+    }
+
+    public function getTemporaryMetrics()
+    {
+        return array('sum_time_generation');
+    }
+
+    public function compute(Row $row)
+    {
+        $sumGenerationTime = $this->getMetric($row, 'sum_time_generation');
+        $hitsWithTimeGeneration = $this->getMetric($row, 'nb_hits_with_time_generation');
+
+        return Piwik::getQuotientSafe($sumGenerationTime, $hitsWithTimeGeneration, $precision = 3);
+    }
+
+    public function format($value, Formatter $formatter)
+    {
+        if ($formatter instanceof Formatter\Html
+            && !$value
+        ) {
+            return '-';
+        } else {
+            return $formatter->getPrettyTimeFromSeconds($value, $displayAsSentence = true);
+        }
+    }
+
+    public function beforeCompute($report, DataTable $table)
+    {
+        $hasTimeGeneration = array_sum($this->getMetricValues($table, 'sum_time_generation')) > 0;
+
+        if (!$hasTimeGeneration
+            && $table->getRowsCount() != 0
+            && !$this->hasAverageTimeGeneration($table)
+        ) {
+            // No generation time: remove it from the API output and add it to empty_columns metadata, so that
+            // the columns can also be removed from the view
+            $table->filter('ColumnDelete', array(array(
+                Metrics::INDEX_PAGE_SUM_TIME_GENERATION,
+                Metrics::INDEX_PAGE_NB_HITS_WITH_TIME_GENERATION,
+                Metrics::INDEX_PAGE_MIN_TIME_GENERATION,
+                Metrics::INDEX_PAGE_MAX_TIME_GENERATION,
+                'sum_time_generation',
+                'nb_hits_with_time_generation',
+                'min_time_generation',
+                'max_time_generation'
+            )));
+
+            if ($table instanceof DataTable) {
+                $emptyColumns = $table->getMetadata(DataTable::EMPTY_COLUMNS_METADATA_NAME);
+                if (!is_array($emptyColumns)) {
+                    $emptyColumns = array();
+                }
+                $emptyColumns[] = 'sum_time_generation';
+                $emptyColumns[] = 'avg_time_generation';
+                $emptyColumns[] = 'min_time_generation';
+                $emptyColumns[] = 'max_time_generation';
+                $table->setMetadata(DataTable::EMPTY_COLUMNS_METADATA_NAME, $emptyColumns);
+            }
+        }
+
+        return $hasTimeGeneration;
+    }
+
+    private function hasAverageTimeGeneration(DataTable $table)
+    {
+        return $table->getFirstRow()->getColumn('avg_time_generation') !== false;
+    }
+}