Complete modularization of the GC daemon

Summary: This modularizes the rest of the GC submethods. Turned out there was nothing tricky.

Test Plan: Ran `bin/phd debug garbage` and got reasonable looking behavior and output.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7971

src/applications/cache/garbagecollector/PhabricatorCacheGeneralGarbageCollector.php

@@ -0,0 +1,26 @@
+<?php
+
+final class PhabricatorCacheGeneralGarbageCollector
+  extends PhabricatorGarbageCollector {
+
+  public function collectGarbage() {
+    $key = 'gcdaemon.ttl.general-cache';
+    $ttl = PhabricatorEnv::getEnvConfig($key);
+    if ($ttl <= 0) {
+      return false;
+    }
+
+    $cache = new PhabricatorKeyValueDatabaseCache();
+    $conn_w = $cache->establishConnection('w');
+
+    queryfx(
+      $conn_w,
+      'DELETE FROM %T WHERE cacheCreated < %d
+        ORDER BY cacheCreated ASC LIMIT 100',
+      $cache->getTableName(),
+      time() - $ttl);
+
+    return ($conn_w->getAffectedRows() == 100);
+  }
+
+}

src/applications/cache/garbagecollector/PhabricatorCacheMarkupGarbageCollector.php

@@ -0,0 +1,25 @@
+<?php
+
+final class PhabricatorCacheMarkupGarbageCollector
+  extends PhabricatorGarbageCollector {
+
+  public function collectGarbage() {
+    $key = 'gcdaemon.ttl.markup-cache';
+    $ttl = PhabricatorEnv::getEnvConfig($key);
+    if ($ttl <= 0) {
+      return false;
+    }
+
+    $table = new PhabricatorMarkupCache();
+    $conn_w = $table->establishConnection('w');
+
+    queryfx(
+      $conn_w,
+      'DELETE FROM %T WHERE dateCreated < %d LIMIT 100',
+      $table->getTableName(),
+      time() - $ttl);
+
+    return ($conn_w->getAffectedRows() == 100);
+  }
+
+}

src/applications/cache/garbagecollector/PhabricatorCacheTTLGarbageCollector.php

@@ -0,0 +1,20 @@
+<?php
+
+final class PhabricatorCacheTTLGarbageCollector
+  extends PhabricatorGarbageCollector {
+
+  public function collectGarbage() {
+    $cache = new PhabricatorKeyValueDatabaseCache();
+    $conn_w = $cache->establishConnection('w');
+
+    queryfx(
+      $conn_w,
+      'DELETE FROM %T WHERE cacheExpires < %d
+        ORDER BY cacheExpires ASC LIMIT 100',
+      $cache->getTableName(),
+      time());
+
+    return ($conn_w->getAffectedRows() == 100);
+  }
+
+}