slawekjaranowski commented on code in PR #445:
URL: 
https://github.com/apache/maven-install-plugin/pull/445#discussion_r3898787274


##########
src/main/java/org/apache/maven/plugins/install/InstallMojo.java:
##########
@@ -163,19 +177,55 @@ public void execute() {
         }
 
         List<Project> projectsUsingPlugin = getProjectsUsingPlugin();
-        if (allProjectsMarked(projectsUsingPlugin)) {
-            for (Project reactorProject : projectsUsingPlugin) {
-                State state = getState(reactorProject);
-                if (state == State.TO_BE_INSTALLED) {
-                    Map<String, Object> pluginContext = 
session.getPluginContext(reactorProject);
-                    ArtifactInstallerRequest request =
-                            (ArtifactInstallerRequest) 
pluginContext.get(ArtifactInstallerRequest.class.getName());
-                    installProject(request);
+        synchronized (DEFERRED_INSTALL_LOCK) {
+            if (allProjectsMarked(projectsUsingPlugin)) {
+                List<Project> installedProjects = new ArrayList<>();
+                for (Project reactorProject : projectsUsingPlugin) {
+                    State state = getState(reactorProject);
+                    if (state == State.TO_BE_INSTALLED) {
+                        Map<String, Object> pluginContext = 
session.getPluginContext(reactorProject);
+                        ArtifactInstallerRequest request =
+                                (ArtifactInstallerRequest) 
pluginContext.get(ArtifactInstallerRequest.class.getName());
+                        try {
+                            installProject(request);

Review Comment:
   In master branch we build request wich contains all artifacts from all 
projects, and finally  `repositorySystem.install` is called only once, so we 
resolver take care about install all artifacts



##########
src/main/java/org/apache/maven/plugins/install/InstallMojo.java:
##########
@@ -163,19 +177,55 @@ public void execute() {
         }
 
         List<Project> projectsUsingPlugin = getProjectsUsingPlugin();
-        if (allProjectsMarked(projectsUsingPlugin)) {
-            for (Project reactorProject : projectsUsingPlugin) {
-                State state = getState(reactorProject);
-                if (state == State.TO_BE_INSTALLED) {
-                    Map<String, Object> pluginContext = 
session.getPluginContext(reactorProject);
-                    ArtifactInstallerRequest request =
-                            (ArtifactInstallerRequest) 
pluginContext.get(ArtifactInstallerRequest.class.getName());
-                    installProject(request);
+        synchronized (DEFERRED_INSTALL_LOCK) {
+            if (allProjectsMarked(projectsUsingPlugin)) {
+                List<Project> installedProjects = new ArrayList<>();
+                for (Project reactorProject : projectsUsingPlugin) {
+                    State state = getState(reactorProject);
+                    if (state == State.TO_BE_INSTALLED) {
+                        Map<String, Object> pluginContext = 
session.getPluginContext(reactorProject);
+                        ArtifactInstallerRequest request =
+                                (ArtifactInstallerRequest) 
pluginContext.get(ArtifactInstallerRequest.class.getName());
+                        try {
+                            installProject(request);

Review Comment:
   In 3.x branch we build request wich contains all artifacts from all 
projects, and finally  `repositorySystem.install` is called only once, so we 
resolver take care about install all artifacts



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