Primo Committ

vendor/laravel/framework/src/Illuminate/Cache/DatabaseLock.php

@@ -0,0 +1,139 @@
+<?php
+
+namespace Illuminate\Cache;
+
+use Illuminate\Database\Connection;
+use Illuminate\Database\QueryException;
+use Illuminate\Support\Carbon;
+
+class DatabaseLock extends Lock
+{
+    /**
+     * The database connection instance.
+     *
+     * @var \Illuminate\Database\Connection
+     */
+    protected $connection;
+
+    /**
+     * The database table name.
+     *
+     * @var string
+     */
+    protected $table;
+
+    /**
+     * The prune probability odds.
+     *
+     * @var array
+     */
+    protected $lottery;
+
+    /**
+     * Create a new lock instance.
+     *
+     * @param  \Illuminate\Database\Connection  $connection
+     * @param  string  $table
+     * @param  string  $name
+     * @param  int  $seconds
+     * @param  string|null  $owner
+     * @param  array  $lottery
+     * @return void
+     */
+    public function __construct(Connection $connection, $table, $name, $seconds, $owner = null, $lottery = [2, 100])
+    {
+        parent::__construct($name, $seconds, $owner);
+
+        $this->connection = $connection;
+        $this->table = $table;
+        $this->lottery = $lottery;
+    }
+
+    /**
+     * Attempt to acquire the lock.
+     *
+     * @return bool
+     */
+    public function acquire()
+    {
+        $acquired = false;
+
+        try {
+            $this->connection->table($this->table)->insert([
+                'key' => $this->name,
+                'owner' => $this->owner,
+                'expiration' => $this->expiresAt(),
+            ]);
+
+            $acquired = true;
+        } catch (QueryException $e) {
+            $updated = $this->connection->table($this->table)
+                ->where('key', $this->name)
+                ->where(function ($query) {
+                    return $query->where('owner', $this->owner)->orWhere('expiration', '<=', time());
+                })->update([
+                    'owner' => $this->owner,
+                    'expiration' => $this->expiresAt(),
+                ]);
+
+            $acquired = $updated >= 1;
+        }
+
+        if (random_int(1, $this->lottery[1]) <= $this->lottery[0]) {
+            $this->connection->table($this->table)->where('expiration', '<=', time())->delete();
+        }
+
+        return $acquired;
+    }
+
+    /**
+     * Get the UNIX timestamp indicating when the lock should expire.
+     *
+     * @return int
+     */
+    protected function expiresAt()
+    {
+        return $this->seconds > 0 ? time() + $this->seconds : Carbon::now()->addDays(1)->getTimestamp();
+    }
+
+    /**
+     * Release the lock.
+     *
+     * @return bool
+     */
+    public function release()
+    {
+        if ($this->isOwnedByCurrentProcess()) {
+            $this->connection->table($this->table)
+                        ->where('key', $this->name)
+                        ->where('owner', $this->owner)
+                        ->delete();
+
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Releases this lock in disregard of ownership.
+     *
+     * @return void
+     */
+    public function forceRelease()
+    {
+        $this->connection->table($this->table)
+                    ->where('key', $this->name)
+                    ->delete();
+    }
+
+    /**
+     * Returns the owner value written into the driver for this lock.
+     *
+     * @return string
+     */
+    protected function getCurrentOwner()
+    {
+        return optional($this->connection->table($this->table)->where('key', $this->name)->first())->owner;
+    }
+}