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@@ -178,6 +178,7 @@ function get(app_root):
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         return container.app.connect()
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       on exception:
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         container.sessions--
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+				domain.size--
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         if (attempt == MAX_ATTEMPTS):
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           propagate exception
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         else:

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@@ -215,7 +215,8 @@ private:
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       AppContainerList *instances = &domain->instances;
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       P_ASSERT(domain->size <= count, false,
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-				"domains['" << appRoot << "'].size <= count");
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+				"domains['" << appRoot << "'].size (" << domain->size <<
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+				") <= count (" << count << ")");
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       totalSize += domain->size;
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       // Invariants for Domain.
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@@ -629,6 +630,7 @@ public:
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         return container->app->connect(SessionCloseCallback(data, container));
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       } catch (const exception &e) {
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         container->sessions--;
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+				domain->size--;
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         if (attempt == MAX_GET_ATTEMPTS) {
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           string message("Cannot connect to an existing "
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             "application instance for '");
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@@ -652,7 +654,7 @@ public:
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           active--;
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           activeOrMaxChanged.notify_all();
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           P_ASSERT(verifyState(), Application::SessionPtr(),
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-						"State is valid.");
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+						"State is valid: " << toString(false));
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         }
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       }
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     }