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<div class="aboutLanguage"><em>Ignite - In-Memory Data Fabric</em></div>
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<div class="subTitle">org.apache.ignite</div>
<h2 title="Interface IgniteTransactions" class="title">Interface IgniteTransactions</h2>
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<pre>public interface <span class="strong">IgniteTransactions</span></pre>
<div class="block">Transactions facade provides ACID-compliant semantic when working with caches. You can
create a transaction when working with one cache or across multiple caches. Caches with
different cache modes, like <a href="../../../org/apache/ignite/cache/CacheMode.html#PARTITIONED"><code>PARTITIONED</code></a> or
<a href="../../../org/apache/ignite/cache/CacheMode.html#REPLICATED"><code>REPLICATED</code></a>, can also participate in the same transaction.
<p>
Transactions are <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang"><code>AutoCloseable</code></a>, so they will automatically rollback unless
explicitly committed.
<p>
Here is an example of a transaction:
<pre class="brush:java">
try (Transaction tx = Ignition.ignite().transactions().txStart()) {
Account acct = cache.get(acctId);
// Current balance.
double balance = acct.getBalance();
// Deposit $100 into account.
acct.setBalance(balance + 100);
// Store updated account in cache.
cache.put(acctId, acct);
tx.commit();
}
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<h3>Method Summary</h3>
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<caption><span>Methods</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr class="altColor">
<td class="colFirst"><code><a href="../../../org/apache/ignite/transactions/TransactionMetrics.html" title="interface in org.apache.ignite.transactions">TransactionMetrics</a></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/ignite/IgniteTransactions.html#metrics()">metrics</a></strong>()</code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/ignite/IgniteTransactions.html#resetMetrics()">resetMetrics</a></strong>()</code>
<div class="block">Resets transaction metrics.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../org/apache/ignite/transactions/Transaction.html" title="interface in org.apache.ignite.transactions">Transaction</a></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/ignite/IgniteTransactions.html#tx()">tx</a></strong>()</code>
<div class="block">Gets transaction started by this thread or <code>null</code> if this thread does
not have a transaction.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../org/apache/ignite/transactions/Transaction.html" title="interface in org.apache.ignite.transactions">Transaction</a></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/ignite/IgniteTransactions.html#txStart()">txStart</a></strong>()</code>
<div class="block">Starts transaction with default isolation, concurrency, timeout, and invalidation policy.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../org/apache/ignite/transactions/Transaction.html" title="interface in org.apache.ignite.transactions">Transaction</a></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/ignite/IgniteTransactions.html#txStart(org.apache.ignite.transactions.TransactionConcurrency,%20org.apache.ignite.transactions.TransactionIsolation)">txStart</a></strong>(<a href="../../../org/apache/ignite/transactions/TransactionConcurrency.html" title="enum in org.apache.ignite.transactions">TransactionConcurrency</a>&nbsp;concurrency,
<a href="../../../org/apache/ignite/transactions/TransactionIsolation.html" title="enum in org.apache.ignite.transactions">TransactionIsolation</a>&nbsp;isolation)</code>
<div class="block">Starts new transaction with the specified concurrency and isolation.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../org/apache/ignite/transactions/Transaction.html" title="interface in org.apache.ignite.transactions">Transaction</a></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/ignite/IgniteTransactions.html#txStart(org.apache.ignite.transactions.TransactionConcurrency,%20org.apache.ignite.transactions.TransactionIsolation,%20long,%20int)">txStart</a></strong>(<a href="../../../org/apache/ignite/transactions/TransactionConcurrency.html" title="enum in org.apache.ignite.transactions">TransactionConcurrency</a>&nbsp;concurrency,
<a href="../../../org/apache/ignite/transactions/TransactionIsolation.html" title="enum in org.apache.ignite.transactions">TransactionIsolation</a>&nbsp;isolation,
long&nbsp;timeout,
int&nbsp;txSize)</code>
<div class="block">Starts transaction with specified isolation, concurrency, timeout, invalidation flag,
and number of participating entries.</div>
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<h3>Method Detail</h3>
<a name="txStart()">
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<h4>txStart</h4>
<pre><a href="../../../org/apache/ignite/transactions/Transaction.html" title="interface in org.apache.ignite.transactions">Transaction</a>&nbsp;txStart()
throws <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></pre>
<div class="block">Starts transaction with default isolation, concurrency, timeout, and invalidation policy.
All defaults are set in <a href="../../../org/apache/ignite/configuration/TransactionConfiguration.html" title="class in org.apache.ignite.configuration"><code>TransactionConfiguration</code></a> at startup.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>New transaction</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - If transaction is already started by this thread.</dd></dl>
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<h4>txStart</h4>
<pre><a href="../../../org/apache/ignite/transactions/Transaction.html" title="interface in org.apache.ignite.transactions">Transaction</a>&nbsp;txStart(<a href="../../../org/apache/ignite/transactions/TransactionConcurrency.html" title="enum in org.apache.ignite.transactions">TransactionConcurrency</a>&nbsp;concurrency,
<a href="../../../org/apache/ignite/transactions/TransactionIsolation.html" title="enum in org.apache.ignite.transactions">TransactionIsolation</a>&nbsp;isolation)</pre>
<div class="block">Starts new transaction with the specified concurrency and isolation.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>concurrency</code> - Concurrency.</dd><dd><code>isolation</code> - Isolation.</dd>
<dt><span class="strong">Returns:</span></dt><dd>New transaction.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - If transaction is already started by this thread.</dd></dl>
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<h4>txStart</h4>
<pre><a href="../../../org/apache/ignite/transactions/Transaction.html" title="interface in org.apache.ignite.transactions">Transaction</a>&nbsp;txStart(<a href="../../../org/apache/ignite/transactions/TransactionConcurrency.html" title="enum in org.apache.ignite.transactions">TransactionConcurrency</a>&nbsp;concurrency,
<a href="../../../org/apache/ignite/transactions/TransactionIsolation.html" title="enum in org.apache.ignite.transactions">TransactionIsolation</a>&nbsp;isolation,
long&nbsp;timeout,
int&nbsp;txSize)</pre>
<div class="block">Starts transaction with specified isolation, concurrency, timeout, invalidation flag,
and number of participating entries.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>concurrency</code> - Concurrency.</dd><dd><code>isolation</code> - Isolation.</dd><dd><code>timeout</code> - Timeout.</dd><dd><code>txSize</code> - Number of entries participating in transaction (may be approximate).</dd>
<dt><span class="strong">Returns:</span></dt><dd>New transaction.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - If transaction is already started by this thread.</dd></dl>
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<h4>tx</h4>
<pre><a href="../../../org/apache/ignite/transactions/Transaction.html" title="interface in org.apache.ignite.transactions">Transaction</a>&nbsp;tx()</pre>
<div class="block">Gets transaction started by this thread or <code>null</code> if this thread does
not have a transaction.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Transaction started by this thread or <code>null</code> if this thread
does not have a transaction.</dd></dl>
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<h4>metrics</h4>
<pre><a href="../../../org/apache/ignite/transactions/TransactionMetrics.html" title="interface in org.apache.ignite.transactions">TransactionMetrics</a>&nbsp;metrics()</pre>
<dl><dt><span class="strong">Returns:</span></dt><dd>Transaction metrics.</dd></dl>
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<h4>resetMetrics</h4>
<pre>void&nbsp;resetMetrics()</pre>
<div class="block">Resets transaction metrics.</div>
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