Added some comments

Kieker.WebGUI/src/main/java/kieker/webgui/persistence/IProjectDAO.java

@@ -153,7 +153,9 @@ public interface IProjectDAO {
 	 * @param username
 	 *            The name of the user who saves the project.
 	 * @param analysisLayout
-	 *            The current layout of the analysis graph. It is valid if this parameter is null.
+	 *            The current layout of the analysis graph. It is valid if this parameter is null. In this case the stored layout will not be changed.
+	 * @param cockpitLayout
+	 *            The current layout of the cockpit. It is valid if this parameter is null. In this case the stored layout will not be changed.
 	 * 
 	 * @throws ProjectNotExistingException
 	 *             If a project with the given name does not exist.
@@ -286,7 +288,7 @@ public interface IProjectDAO {
 	public abstract String getLastUser(final String projectName);
 
 	/**
-	 * Delivers the stored layout for the given project.
+	 * Delivers the stored analysis layout for the given project.
 	 * 
 	 * @param projectName
 	 *            The name of the project.
@@ -296,6 +298,14 @@ public interface IProjectDAO {
 	@PreAuthorize("isAuthenticated()")
 	public abstract String getAnalysisLayout(String projectName);
 
+	/**
+	 * Delivers the stored cockpit layout for the given project.
+	 * 
+	 * @param projectName
+	 *            The name of the project.
+	 * 
+	 * @return The layout string as it is stored within the meta data. If this isn't available, null will be returned.
+	 */
 	@PreAuthorize("isAuthenticated()")
 	public abstract String getCockpitLayout(String projectName);
 

Kieker.WebGUI/src/main/java/kieker/webgui/service/IProjectService.java

@@ -163,7 +163,9 @@ public interface IProjectService {
 	 * @param username
 	 *            The name of the user who saves the project.
 	 * @param analysisLayout
-	 *            The current layout of the analysis graph. It is valid if this parameter is null.
+	 *            The current layout of the analysis graph. It is valid if this parameter is null. In this case the stored layout will not be changed.
+	 * @param cockpitLayout
+	 *            The current layout of the cockpit. It is valid if this parameter is null. In this case the stored layout will not be changed.
 	 * 
 	 * @throws ProjectNotExistingException
 	 *             If a project with the given name does not exist.
@@ -388,7 +390,7 @@ public interface IProjectService {
 	public boolean deleteLibrary(String projectName, String libName) throws IOException;
 
 	/**
-	 * Delivers the stored layout for the given project.
+	 * Delivers the stored analysis layout for the given project.
 	 * 
 	 * @param projectName
 	 *            The name of the project.
@@ -398,6 +400,14 @@ public interface IProjectService {
 	@PreAuthorize("isAuthenticated()")
 	public abstract String getAnalysisLayout(String projectName);
 
+	/**
+	 * Delivers the stored cockpit layout for the given project.
+	 * 
+	 * @param projectName
+	 *            The name of the project.
+	 * 
+	 * @return The layout string as it is stored within the meta data. If this isn't available, null will be returned.
+	 */
 	@PreAuthorize("isAuthenticated()")
 	public abstract String getCockpitLayout(String projectName);
 }