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454 lines
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<title>DB::Pool(T) - github.com/crystal-lang/crystal-db</title>
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<li class="parent open current" data-id="github.com/crystal-lang/crystal-db/DB" data-name="db">
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<a href="../DB.html">DB</a>
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<a href="../DB/Error.html">Error</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/ExecResult" data-name="db::execresult">
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<a href="../DB/ExecResult.html">ExecResult</a>
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<a href="../DB/Mappable.html">Mappable</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/MappingException" data-name="db::mappingexception">
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<a href="../DB/MappingException.html">MappingException</a>
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<li class="parent current" data-id="github.com/crystal-lang/crystal-db/DB/Pool" data-name="db::pool(t)">
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<a href="../DB/Pool.html">Pool</a>
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<ul>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/Pool/TimeoutHelper" data-name="db::pool::timeouthelper">
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<a href="../DB/Pool/TimeoutHelper.html">TimeoutHelper</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/PoolPreparedStatement" data-name="db::poolpreparedstatement">
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<a href="../DB/PoolPreparedStatement.html">PoolPreparedStatement</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/PoolRetryAttemptsExceeded" data-name="db::poolretryattemptsexceeded">
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<a href="../DB/PoolRetryAttemptsExceeded.html">PoolRetryAttemptsExceeded</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/PoolStatement" data-name="db::poolstatement">
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<a href="../DB/PoolStatement.html">PoolStatement</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/PoolTimeout" data-name="db::pooltimeout">
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<a href="../DB/PoolTimeout.html">PoolTimeout</a>
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</li>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/PoolUnpreparedStatement" data-name="db::poolunpreparedstatement">
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<a href="../DB/PoolUnpreparedStatement.html">PoolUnpreparedStatement</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/QueryMethods" data-name="db::querymethods">
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<a href="../DB/QueryMethods.html">QueryMethods</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/ResultSet" data-name="db::resultset">
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<a href="../DB/ResultSet.html">ResultSet</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/Rollback" data-name="db::rollback">
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<a href="../DB/Rollback.html">Rollback</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/SavePointTransaction" data-name="db::savepointtransaction">
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<a href="../DB/SavePointTransaction.html">SavePointTransaction</a>
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</li>
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<li class="parent " data-id="github.com/crystal-lang/crystal-db/DB/SessionMethods" data-name="db::sessionmethods(session, stmt)">
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<a href="../DB/SessionMethods.html">SessionMethods</a>
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<ul>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/SessionMethods/PreparedQuery" data-name="db::sessionmethods::preparedquery(session, stmt)">
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<a href="../DB/SessionMethods/PreparedQuery.html">PreparedQuery</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/SessionMethods/UnpreparedQuery" data-name="db::sessionmethods::unpreparedquery(session, stmt)">
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<a href="../DB/SessionMethods/UnpreparedQuery.html">UnpreparedQuery</a>
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</ul>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/Statement" data-name="db::statement">
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<a href="../DB/Statement.html">Statement</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/StatementMethods" data-name="db::statementmethods">
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<a href="../DB/StatementMethods.html">StatementMethods</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/StringKeyCache" data-name="db::stringkeycache(t)">
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<a href="../DB/StringKeyCache.html">StringKeyCache</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/TopLevelTransaction" data-name="db::topleveltransaction">
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<a href="../DB/TopLevelTransaction.html">TopLevelTransaction</a>
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<li class=" " data-id="github.com/crystal-lang/crystal-db/DB/Transaction" data-name="db::transaction">
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<a href="../DB/Transaction.html">Transaction</a>
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</ul>
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</ul>
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</div>
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<div id="main-content">
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<h1 class="type-name">
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<span class="kind">class</span> DB::Pool(T)
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</h1>
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<ul class="superclass-hierarchy"><li class="superclass"><a href="../DB/Pool.html">DB::Pool(T)</a></li><li class="superclass">Reference</li><li class="superclass">Object</li></ul>
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<h2>Defined in:</h2>
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<a href="https://github.com/crystal-lang/crystal-db/blob/28c6f3b715f0c82d2a37106fd5a55882a238cc1f/src/db/pool.cr#L4" target="_blank">db/pool.cr</a>
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<br/>
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<h2>Class Method Summary</h2>
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<ul class="list-summary">
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<li class="entry-summary">
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<a href="#new%28initial_pool_size%3D1%2Cmax_pool_size%3D0%2Cmax_idle_pool_size%3D1%2Ccheckout_timeout%3D5.0%2Cretry_attempts%3D1%2Cretry_delay%3D0.2%2C%26factory%3A-%3ET%29-class-method" class="signature"><strong>.new</strong>(initial_pool_size = <span class="n">1</span>, max_pool_size = <span class="n">0</span>, max_idle_pool_size = <span class="n">1</span>, checkout_timeout = <span class="n">5.0</span>, retry_attempts = <span class="n">1</span>, retry_delay = <span class="n">0.2</span>, &factory : -> T)</a>
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</li>
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</ul>
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<h2>Instance Method Summary</h2>
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<ul class="list-summary">
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<li class="entry-summary">
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<a href="#checkout%3AT-instance-method" class="signature"><strong>#checkout</strong> : T</a>
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</li>
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<li class="entry-summary">
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<a href="#checkout_some%28candidates%3AEnumerable%28WeakRef%28T%29%29%29%3A%3A%3ATuple%28T%2CBool%29-instance-method" class="signature"><strong>#checkout_some</strong>(candidates : Enumerable(WeakRef(T))) : ::Tuple(T, Bool)</a>
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<div class="summary"><pre><code class='language-selected, is_candidate = pool.checkout_some(candidates) ``` `selected` be a resource from the `candidates` list and `is_candidate` == `true` or `selected` will be a new resource adn `is_candidate` == `false`'></code></pre></div>
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</li>
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<li class="entry-summary">
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<a href="#close%3ANil-instance-method" class="signature"><strong>#close</strong> : Nil</a>
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<div class="summary"><p>close all resources in the pool</p></div>
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</li>
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<li class="entry-summary">
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<a href="#release%28resource%3AT%29%3ANil-instance-method" class="signature"><strong>#release</strong>(resource : T) : Nil</a>
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</li>
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<li class="entry-summary">
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<a href="#retry%28%26block%29-instance-method" class="signature"><strong>#retry</strong>(&block)</a>
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<div class="summary"><p>:nodoc: Will retry the block if a <code><a href="../DB/ConnectionLost.html">ConnectionLost</a></code> exception is thrown.</p></div>
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</li>
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</ul>
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<div class="methods-inherited">
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</div>
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<h2>Class Method Detail</h2>
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<div class="entry-detail" id="new(initial_pool_size=1,max_pool_size=0,max_idle_pool_size=1,checkout_timeout=5.0,retry_attempts=1,retry_delay=0.2,&factory:->T)-class-method">
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<div class="signature">
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def self.<strong>new</strong>(initial_pool_size = <span class="n">1</span>, max_pool_size = <span class="n">0</span>, max_idle_pool_size = <span class="n">1</span>, checkout_timeout = <span class="n">5.0</span>, retry_attempts = <span class="n">1</span>, retry_delay = <span class="n">0.2</span>, &factory : -> T)
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<a class="method-permalink" href="#new%28initial_pool_size%3D1%2Cmax_pool_size%3D0%2Cmax_idle_pool_size%3D1%2Ccheckout_timeout%3D5.0%2Cretry_attempts%3D1%2Cretry_delay%3D0.2%2C%26factory%3A-%3ET%29-class-method">#</a>
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</div>
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<br/>
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<div>
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[<a href="https://github.com/crystal-lang/crystal-db/blob/28c6f3b715f0c82d2a37106fd5a55882a238cc1f/src/db/pool.cr#L15" target="_blank">View source</a>]
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</div>
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</div>
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<h2>Instance Method Detail</h2>
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<div class="entry-detail" id="checkout:T-instance-method">
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<div class="signature">
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def <strong>checkout</strong> : T
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<a class="method-permalink" href="#checkout%3AT-instance-method">#</a>
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</div>
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<br/>
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<div>
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[<a href="https://github.com/crystal-lang/crystal-db/blob/28c6f3b715f0c82d2a37106fd5a55882a238cc1f/src/db/pool.cr#L31" target="_blank">View source</a>]
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</div>
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</div>
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<div class="entry-detail" id="checkout_some(candidates:Enumerable(WeakRef(T))):::Tuple(T,Bool)-instance-method">
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<div class="signature">
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def <strong>checkout_some</strong>(candidates : Enumerable(WeakRef(T))) : ::Tuple(T, Bool)
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<a class="method-permalink" href="#checkout_some%28candidates%3AEnumerable%28WeakRef%28T%29%29%29%3A%3A%3ATuple%28T%2CBool%29-instance-method">#</a>
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</div>
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<div class="doc"><pre><code>selected, is_candidate <span class="o">=</span> pool.checkout_some(candidates)</code></pre>
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<p><code>selected</code> be a resource from the <code>candidates</code> list and <code>is_candidate</code> == <code>true</code>
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or <code>selected</code> will be a new resource adn <code>is_candidate</code> == <code>false</code></p></div>
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<br/>
|
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<div>
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[<a href="https://github.com/crystal-lang/crystal-db/blob/28c6f3b715f0c82d2a37106fd5a55882a238cc1f/src/db/pool.cr#L53" target="_blank">View source</a>]
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||
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</div>
|
||
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</div>
|
||
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||
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<div class="entry-detail" id="close:Nil-instance-method">
|
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|
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<div class="signature">
|
||
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|
||
|
|
def <strong>close</strong> : Nil
|
||
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|
||
|
|
<a class="method-permalink" href="#close%3ANil-instance-method">#</a>
|
||
|
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</div>
|
||
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||
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<div class="doc"><p>close all resources in the pool</p></div>
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||
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<br/>
|
||
|
|
<div>
|
||
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||
|
|
[<a href="https://github.com/crystal-lang/crystal-db/blob/28c6f3b715f0c82d2a37106fd5a55882a238cc1f/src/db/pool.cr#L25" target="_blank">View source</a>]
|
||
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|
||
|
|
</div>
|
||
|
|
</div>
|
||
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|
||
|
|
<div class="entry-detail" id="release(resource:T):Nil-instance-method">
|
||
|
|
<div class="signature">
|
||
|
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|
||
|
|
def <strong>release</strong>(resource : T) : Nil
|
||
|
|
|
||
|
|
<a class="method-permalink" href="#release%28resource%3AT%29%3ANil-instance-method">#</a>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<br/>
|
||
|
|
<div>
|
||
|
|
|
||
|
|
[<a href="https://github.com/crystal-lang/crystal-db/blob/28c6f3b715f0c82d2a37106fd5a55882a238cc1f/src/db/pool.cr#L69" target="_blank">View source</a>]
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="entry-detail" id="retry(&block)-instance-method">
|
||
|
|
<div class="signature">
|
||
|
|
|
||
|
|
def <strong>retry</strong>(&block)
|
||
|
|
|
||
|
|
<a class="method-permalink" href="#retry%28%26block%29-instance-method">#</a>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<div class="doc"><p>:nodoc:
|
||
|
|
Will retry the block if a <code><a href="../DB/ConnectionLost.html">ConnectionLost</a></code> exception is thrown.
|
||
|
|
It will try to reuse all of the available connection right away,
|
||
|
|
but if a new connection is needed there is a <code>retry_delay</code> seconds delay.</p></div>
|
||
|
|
|
||
|
|
<br/>
|
||
|
|
<div>
|
||
|
|
|
||
|
|
[<a href="https://github.com/crystal-lang/crystal-db/blob/28c6f3b715f0c82d2a37106fd5a55882a238cc1f/src/db/pool.cr#L84" target="_blank">View source</a>]
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
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|
|
||
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||
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||
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||
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|
||
|
|
</div>
|
||
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|
|
||
|
|
</body>
|
||
|
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</html>
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