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DifferentialViewStateGarbageCollector.php
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			<?php

			final class DifferentialViewStateGarbageCollector
			extends PhabricatorGarbageCollector {

			const COLLECTORCONST = 'differential.viewstate';

			public function getCollectorName() {
			return pht('Differential View States');
			}

			public function getDefaultRetentionPolicy() {
			return phutil_units('180 days in seconds');
			}

			protected function collectGarbage() {
			$table = new DifferentialViewState();
			$conn = $table->establishConnection('w');

			queryfx(
			$conn,
			'DELETE FROM %R WHERE dateModified < %d LIMIT 100',
			$table,
			$this->getGarbageEpoch());

			return ($conn->getAffectedRows() == 100);
			}

			}