build: Update SMC library and corresponding maven plugin

Motivation:

A newer version of the SMC library and its corresponding maven plugin would:

- Enable Graphviz `.dot` file generatation for state machines.

- Enable use of logging in `.sm` files directly.

Modification:

- `Companion.java`: avoid using an enum for comparison which is no
  longer generated by newer SMC.

- `pom.xml`:
  - `version.smc` updated to 7.6.0.
  - Top level dependency artifact is now `smc` of type `pom` rather than
  `statemap`.

- `modules/dcache/pom.xml`:
  - Runtime dependency is `library` artifact instead of `statemap`.
  - `smc-maven-plugin` now obtained from `net.sf.smc` and version-pegged
    to `${version.smc}`.
  - Build dependency is `main` instead of `smc`.
  - `<execution>` blocks have an explicit `<id>`.
  - `<phase>generate-sources</phase>` is specified explicitly.
  - `<targetLanguage>` is now required.
  - Sources must be listed explicitly in a `<sources>` block rather than
     wildcarded.
  - Add a new `<execution>` block to generate the Graphviz files, relocating `<targetLanguage>java7</targetLanguage>` from plugin-wide to execution-local.
  - Add the generated `.dot` files as resources that are shipped in the `.jar` file.

Results:

- Graphviz files corresponding to processed `.sm` state machine files are automatically generated and packaged as part of the build.

Target: master
Patch: https://rb.dcache.org/r/14528/
Requires-notes: NO
Reqiores-book: NO
Acked-by: Tigran Mkrtchyan

Author: greenc-FNAL

modules/dcache/pom.xml

@@ -279,7 +279,8 @@
 
     <dependency>
         <groupId>net.sf.smc</groupId>
-        <artifactId>statemap</artifactId>
+        <artifactId>library</artifactId>
+        <version>${version.smc}</version>
     </dependency>
 
     <dependency>
@@ -384,16 +385,50 @@
   </dependencies>
 
   <build>
+      <resources>
+          <resource>
+              <directory>${project.build.directory}/generated-resources/smc-graphs</directory>
+              <includes>
+                  <include>**/*.dot</include>
+              </includes>
+          </resource>
+      </resources>
       <plugins>
           <plugin>
-              <groupId>org.codehaus.mojo</groupId>
+              <groupId>net.sf.smc</groupId>
               <artifactId>smc-maven-plugin</artifactId>
-              <version>1.0-alpha-1</version>
+              <version>${version.smc}</version>
               <executions>
                   <execution>
+                      <id>src-build</id>
+                      <phase>generate-sources</phase>
+                       <goals>
+                           <goal>smc</goal>
+                       </goals>
+                       <configuration>
+                           <sources>
+                               <source>org/dcache/pool/migration/Task.sm</source>
+                               <source>org/dcache/pool/p2p/Companion.sm</source>
+                           </sources>
+                           <targetLanguage>java7</targetLanguage>
+                       </configuration>
+                  </execution>
+                  <execution>
+                      <id>graphviz-build</id>
+                      <phase>generate-resources</phase>
                       <goals>
                           <goal>smc</goal>
                       </goals>
+                      <configuration>
+                          <sourceDirectory>${project.basedir}/src/main/smc</sourceDirectory>
+                          <targetDirectory>${project.build.directory}/generated-resources/smc-graphs</targetDirectory>
+                          <sources>
+                              <source>org/dcache/pool/migration/Task.sm</source>
+                              <source>org/dcache/pool/p2p/Companion.sm</source>
+                          </sources>
+                          <targetLanguage>graph</targetLanguage>
+                          <glevel>2</glevel>
+                      </configuration>
                   </execution>
               </executions>
               <configuration>
@@ -402,7 +437,7 @@
               <dependencies>
                   <dependency>
                       <groupId>net.sf.smc</groupId>
-                      <artifactId>smc</artifactId>
+                      <artifactId>main</artifactId>
                       <version>${version.smc}</version>
                   </dependency>
               </dependencies>
@@ -482,9 +517,9 @@
                             </pluginExecution>
                             <pluginExecution>
                                 <pluginExecutionFilter>
-                                    <groupId>org.codehaus.mojo</groupId>
+                                    <groupId>net.sf.smc</groupId>
                                     <artifactId>smc-maven-plugin</artifactId>
-                                    <versionRange>[1.0-alpha-1,)</versionRange>
+                                    <versionRange>[${version.smc},)</versionRange>
                                     <goals>
                                         <goal>smc</goal>
                                     </goals>

modules/dcache/src/main/java/org/dcache/pool/p2p/Companion.java

@@ -259,7 +259,7 @@ public long getPingPeriod() {
      */
     public synchronized boolean cancel(Object cause) {
         _fsm.cancel(cause);
-        return (_fsm.getState() != CompanionContext.FSM.Done);
+        return (_fsm.getState().getId() != CompanionContext.FSM_Done_STATE_ID);
     }
 
     public String toString() {

pom.xml

@@ -65,7 +65,7 @@
         <version.spring>5.3.39</version.spring>
         <!-- Remember to sync aspectj version in dcache.properties -->
         <version.aspectj>1.9.24</version.aspectj>
-        <version.smc>6.6.0</version.smc>
+        <version.smc>7.6.0</version.smc>
         <version.xerces>2.12.0</version.xerces>
         <version.jetty>9.4.57.v20241219</version.jetty>
         <version.xrootd4j>4.6.0</version.xrootd4j>
@@ -644,8 +644,9 @@
 
             <dependency>
                 <groupId>net.sf.smc</groupId>
-                <artifactId>statemap</artifactId>
+                <artifactId>smc</artifactId>
                 <version>${version.smc}</version>
+                <type>pom</type>
             </dependency>
 
             <dependency>