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Ice::OperationMode
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<h1 class="Symbol">Ice::OperationMode</h1>
<h2>Overview</h2>
<h3 class="Synopsis">enum OperationMode</h3>
<p>
The <a class="Symbol" href="OperationMode.html">OperationMode</a> determines the retry behavior an
invocation in case of a (potentially) recoverable error.</p>
<h4>Used By</h4>
<dl>
<dt class="Symbol"><a class="Symbol" href="Current.html#mode">Current::mode</a></dt>
</dl>
<h2>Enumerators</h2>
<dl>
<dt class="Symbol">Normal</dt>
<dd>
<p>
Ordinary operations have <tt>Normal</tt> mode. These operations
modify object state; invoking such an operation twice in a row
has different semantics than invoking it once. The Ice run time
guarantees that it will not violate at-most-once semantics for
<tt>Normal</tt> operations.</p>
</dd>
<dt class="Symbol">Nonmutating</dt>
<dd>
<p>
Operations that use the Slice <tt>nonmutating</tt> keyword must not
modify object state. For C++, nonmutating operations generate
<tt>const</tt> member functions in the skeleton. In addition, the Ice
run time will attempt to transparently recover from certain
run-time errors by re-issuing a failed request and propagate
the failure to the application only if the second attempt
fails.
<p class="Deprecated"><tt>Nonmutating</tt> is deprecated; Use the
<tt>idempotent</tt> keyword instead. For C++, to retain the mapping
of <tt>nonmutating</tt> operations to C++ <tt>const</tt>
member functions, use the <tt>["cpp:const"]</tt> metadata
directive.</p>
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<dt class="Symbol">Idempotent</dt>
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<p>
Operations that use the Slice <tt>idempotent</tt> keyword can modify
object state, but invoking an operation twice in a row must
result in the same object state as invoking it once. For
example, <tt>x = 1</tt> is an idempotent statement,
whereas <tt>x += 1</tt> is not. For idempotent
operations, the Ice run-time uses the same retry behavior
as for nonmutating operations in case of a potentially
recoverable error.</p>
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