PhabricatorProjectTriggerUsageIndexEngineExtension.php
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PhabricatorProjectTriggerUsageIndexEngineExtension.php
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			<?php

			final class PhabricatorProjectTriggerUsageIndexEngineExtension
			extends PhabricatorIndexEngineExtension {

			const EXTENSIONKEY = 'trigger.usage';

			public function getExtensionName() {
			return pht('Trigger Usage');
			}

			public function shouldIndexObject($object) {
			if (!($object instanceof PhabricatorProjectTrigger)) {
			return false;
			}

			return true;
			}

			public function indexObject(
			PhabricatorIndexEngine $engine,
			$object) {

			$usage_table = new PhabricatorProjectTriggerUsage();
			$column_table = new PhabricatorProjectColumn();

			$conn_w = $object->establishConnection('w');

			$active_statuses = array(
			PhabricatorProjectColumn::STATUS_ACTIVE,
			);

			// Select summary information to populate the usage index. When picking
			// an "examplePHID", we try to pick an active column.
			$row = queryfx_one(
			$conn_w,
			'SELECT phid, COUNT(*) N, SUM(IF(status IN (%Ls), 1, 0)) M FROM %R
			WHERE triggerPHID = %s
			ORDER BY IF(status IN (%Ls), 1, 0) DESC, id ASC',
			$active_statuses,
			$column_table,
			$object->getPHID(),
			$active_statuses);
			if ($row) {
			$example_phid = $row['phid'];
			$column_count = $row['N'];
			$active_count = $row['M'];
			} else {
			$example_phid = null;
			$column_count = 0;
			$active_count = 0;
			}

			queryfx(
			$conn_w,
			'INSERT INTO %R (triggerPHID, examplePHID, columnCount, activeColumnCount)
			VALUES (%s, %ns, %d, %d)
			ON DUPLICATE KEY UPDATE
			examplePHID = VALUES(examplePHID),
			columnCount = VALUES(columnCount),
			activeColumnCount = VALUES(activeColumnCount)',
			$usage_table,
			$object->getPHID(),
			$example_phid,
			$column_count,
			$active_count);
			}

			}