Throw exception when deploy with used deployment name (#3183)

Author: Flanker32

PluginsAndFeatures/azure-toolkit-for-intellij/src/com/microsoft/intellij/forms/arm/CreateDeploymentForm.java

@@ -38,13 +38,16 @@
 import com.intellij.openapi.wm.WindowManager;
 import com.intellij.ui.HyperlinkLabel;
 import com.microsoft.azure.management.Azure;
+import com.microsoft.azure.management.resources.Deployment;
 import com.microsoft.azure.management.resources.Deployment.DefinitionStages.WithTemplate;
 import com.microsoft.azure.management.resources.DeploymentMode;
 import com.microsoft.azure.management.resources.Location;
 import com.microsoft.azure.management.resources.ResourceGroup;
 import com.microsoft.azure.management.resources.fluentcore.arm.Region;
 import com.microsoft.azuretools.authmanage.AuthMethodManager;
 import com.microsoft.azuretools.authmanage.models.SubscriptionDetail;
+import com.microsoft.azuretools.core.mvp.model.AzureMvpModel;
+import com.microsoft.azuretools.core.mvp.model.ResourceEx;
 import com.microsoft.azuretools.telemetry.TelemetryConstants;
 import com.microsoft.azuretools.telemetrywrapper.EventType;
 import com.microsoft.azuretools.telemetrywrapper.EventUtil;
@@ -72,6 +75,8 @@
 
 public class CreateDeploymentForm extends DeploymentBaseForm {
 
+    private static final String DUPLICATED_DEPLOYMENT_NAME = "A deployment with the same name already exists";
+
     private JPanel contentPane;
     private JTextField rgNameTextFiled;
     private JComboBox rgNameCb;
@@ -153,6 +158,13 @@ public void run(@NotNull ProgressIndicator indicator) {
                                 ((ElementWrapper<Region>) regionCb.getSelectedItem()).getValue());
                     } else {
                         ResourceGroup rg = ((ElementWrapper<ResourceGroup>) rgNameCb.getSelectedItem()).getValue();
+                        List<ResourceEx<Deployment>> deployments = AzureMvpModel.getInstance()
+                                .getDeploymentByRgName(subs.getSubscriptionId(), rg.name());
+                        boolean isExist = deployments.parallelStream()
+                                .anyMatch(deployment -> deployment.getResource().name().equals(deploymentName));
+                        if (isExist) {
+                            throw new RuntimeException(DUPLICATED_DEPLOYMENT_NAME);
+                        }
                         rgName = rg.name();
                         template = azure.deployments().define(deploymentName).withExistingResourceGroup(rg);
                     }