[JENKINS-64816] prepare for support of node monitors by JCasC (#8629)

* [JENKINS-64816] prepare for support of node monitors by JCasC

In order that configuration as code plugin can properly support node
monitors we need to add databound constructors.

* fix warnings

* add javadoc that DataBoundConstructor is a must

* remove duplicate extension

* delete obsolete install methods

core/src/main/java/hudson/node_monitors/ArchitectureMonitor.java

@@ -32,6 +32,7 @@ import java.io.IOException;
 import jenkins.security.MasterToSlaveCallable;
 import net.sf.json.JSONObject;
 import org.jenkinsci.Symbol;
+import org.kohsuke.stapler.DataBoundConstructor;
 import org.kohsuke.stapler.StaplerRequest;
 
 /**
@@ -40,6 +41,11 @@ import org.kohsuke.stapler.StaplerRequest;
  * @author Kohsuke Kawaguchi
  */
 public class ArchitectureMonitor extends NodeMonitor {
+
+    @DataBoundConstructor
+    public ArchitectureMonitor() {
+    }
+
     @Extension @Symbol("architecture")
     public static final class DescriptorImpl extends AbstractAsyncNodeMonitorDescriptor<String> {
         @Override

core/src/main/java/hudson/node_monitors/ClockMonitor.java

@@ -36,6 +36,7 @@ import net.sf.json.JSONObject;
 import org.jenkinsci.Symbol;
 import org.kohsuke.accmod.Restricted;
 import org.kohsuke.accmod.restrictions.NoExternalUse;
+import org.kohsuke.stapler.DataBoundConstructor;
 import org.kohsuke.stapler.StaplerRequest;
 
 /**
@@ -46,6 +47,11 @@ import org.kohsuke.stapler.StaplerRequest;
  * @since 1.123
  */
 public class ClockMonitor extends NodeMonitor {
+
+    @DataBoundConstructor
+    public ClockMonitor() {
+    }
+
     public ClockDifference getDifferenceFor(Computer c) {
         return DESCRIPTOR.get(c);
     }

core/src/main/java/hudson/node_monitors/DiskSpaceMonitor.java

@@ -25,6 +25,7 @@
 package hudson.node_monitors;
 
 import edu.umd.cs.findbugs.annotations.NonNull;
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import hudson.Extension;
 import hudson.FilePath;
 import hudson.model.Computer;
@@ -34,6 +35,7 @@ import hudson.remoting.Callable;
 import java.io.IOException;
 import java.text.ParseException;
 import jenkins.model.Jenkins;
+import org.jenkinsci.Symbol;
 import org.kohsuke.stapler.DataBoundConstructor;
 
 /**
@@ -61,7 +63,17 @@ public class DiskSpaceMonitor extends AbstractDiskSpaceMonitor {
         return Jenkins.get().hasPermission(Jenkins.ADMINISTER) ? super.getColumnCaption() : null;
     }
 
-    public static final DiskSpaceMonitorDescriptor DESCRIPTOR = new DiskSpaceMonitorDescriptor() {
+    @SuppressFBWarnings(value = "MS_PKGPROTECT", justification = "for backward compatibility")
+    public static /*almost final*/ DiskSpaceMonitorDescriptor DESCRIPTOR;
+
+    @Extension @Symbol("diskSpace")
+    public static class DescriptorImpl extends DiskSpaceMonitorDescriptor {
+
+        @SuppressFBWarnings(value = "ST_WRITE_TO_STATIC_FROM_INSTANCE_METHOD", justification = "for backward compatibility")
+        public DescriptorImpl() {
+            DESCRIPTOR = this;
+        }
+
         @NonNull
         @Override
         public String getDisplayName() {
@@ -78,10 +90,5 @@ public class DiskSpaceMonitor extends AbstractDiskSpaceMonitor {
 
             return p.asCallableWith(new GetUsableSpace());
         }
-    };
-
-    @Extension
-    public static DiskSpaceMonitorDescriptor install() {
-        return DESCRIPTOR;
     }
 }

core/src/main/java/hudson/node_monitors/NodeMonitor.java

@@ -61,6 +61,9 @@ import org.kohsuke.stapler.export.ExportedBean;
  * <p>
  * {@link NodeMonitor}s are persisted via XStream.
  *
+ * <h2>CasC</h2>
+ * To be able to configure {@link NodeMonitor}s via JCasC, they should have a {@link org.kohsuke.stapler.DataBoundConstructor}
+ *
  * @author Kohsuke Kawaguchi
  * @since 1.123
  */

core/src/main/java/hudson/node_monitors/ResponseTimeMonitor.java

@@ -25,6 +25,7 @@
 package hudson.node_monitors;
 
 import edu.umd.cs.findbugs.annotations.NonNull;
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import hudson.Extension;
 import hudson.model.Computer;
 import hudson.remoting.Callable;
@@ -34,6 +35,8 @@ import java.util.Map;
 import java.util.logging.Logger;
 import jenkins.security.MasterToSlaveCallable;
 import net.sf.json.JSONObject;
+import org.jenkinsci.Symbol;
+import org.kohsuke.stapler.DataBoundConstructor;
 import org.kohsuke.stapler.StaplerRequest;
 import org.kohsuke.stapler.export.Exported;
 import org.kohsuke.stapler.export.ExportedBean;
@@ -44,8 +47,22 @@ import org.kohsuke.stapler.export.ExportedBean;
  * @author Kohsuke Kawaguchi
  */
 public class ResponseTimeMonitor extends NodeMonitor {
+
+    @DataBoundConstructor
+    public ResponseTimeMonitor() {
+    }
+
+    @SuppressFBWarnings(value = "MS_PKGPROTECT", justification = "for backward compatibility")
+    public static /*almost final*/ AbstractNodeMonitorDescriptor<Data> DESCRIPTOR;
+
     @Extension
-    public static final AbstractNodeMonitorDescriptor<Data> DESCRIPTOR = new AbstractAsyncNodeMonitorDescriptor<>() {
+    @Symbol("responseTime")
+    public static class DescriptorImpl extends AbstractAsyncNodeMonitorDescriptor<Data> {
+
+        @SuppressFBWarnings(value = "ST_WRITE_TO_STATIC_FROM_INSTANCE_METHOD", justification = "for backward compatibility")
+        public DescriptorImpl() {
+            DESCRIPTOR = this;
+        }
 
         @Override
         protected Callable<Data, IOException> createCallable(Computer c) {
@@ -91,7 +108,7 @@ public class ResponseTimeMonitor extends NodeMonitor {
         public NodeMonitor newInstance(StaplerRequest req, JSONObject formData) throws FormException {
             return new ResponseTimeMonitor();
         }
-    };
+    }
 
     private static final class Step1 extends MasterToSlaveCallable<Data, IOException> {
         private Data cur;

core/src/main/java/hudson/node_monitors/SwapSpaceMonitor.java

@@ -37,6 +37,7 @@ import net.sf.json.JSONObject;
 import org.jenkinsci.Symbol;
 import org.jvnet.hudson.MemoryMonitor;
 import org.jvnet.hudson.MemoryUsage;
+import org.kohsuke.stapler.DataBoundConstructor;
 import org.kohsuke.stapler.StaplerRequest;
 import org.kohsuke.stapler.export.Exported;
 import org.kohsuke.stapler.export.ExportedBean;
@@ -48,6 +49,11 @@ import org.kohsuke.stapler.export.ExportedBean;
  * @since 1.233
  */
 public class SwapSpaceMonitor extends NodeMonitor {
+
+    @DataBoundConstructor
+    public SwapSpaceMonitor() {
+    }
+
     /**
      * Returns the HTML representation of the space.
      */

core/src/main/java/hudson/node_monitors/TemporarySpaceMonitor.java

@@ -101,14 +101,6 @@ public class TemporarySpaceMonitor extends AbstractDiskSpaceMonitor {
         }
     }
 
-    /**
-     * @deprecated as of 2.0
-     */
-    @Deprecated
-    public static DiskSpaceMonitorDescriptor install() {
-        return (DiskSpaceMonitorDescriptor) Jenkins.get().getDescriptor(TemporarySpaceMonitor.class);
-    }
-
     protected static final class GetTempSpace extends MasterToSlaveFileCallable<DiskSpace> {
         @Override
         public DiskSpace invoke(File f, VirtualChannel channel) throws IOException {