Examples of hudson.XmlFile

hudson.XmlFile
Represents an XML data file that Jenkins uses as a data file.
Evolving data format

Changing data format requires a particular care so that users with the old data format can migrate to the newer data format smoothly.
Adding a field is the easiest. When you read an old XML that does not have any data, the newly added field is left to the VM-default value (if you let XStream create the object, such as {@link #read()} — which is the majority), or to the value initialized by theconstructor (if the object is created via new and then its value filled by XStream, such as {@link #unmarshal(Object)}.)
Removing a field requires that you actually leave the field with transient keyword. When you read the old XML, XStream will set the value to this field. But when the data is saved, the field will no longer will be written back to XML. (It might be possible to tweak XStream so that we can simply remove fields from the class. Any help appreciated.)
Changing the data structure is usually a combination of the two above. You'd leave the old data store with transient, and then add the new data. When you are reading the old XML, only the old field will be set. When you are reading the new XML, only the new field will be set. You'll then need to alter the code so that it will be able to correctly handle both situations, and that as soon as you see data in the old field, you'll have to convert that into the new data structure, so that the next save operation will write the new data (otherwise you'll end up losing the data, because old fields will be never written back.)
In some limited cases (specifically when the class is the root object to be read from XML, such as {@link Descriptor}), it is possible to completely and drastically change the data format. See {@link Descriptor#load()} for more about this technique.
There's a few other possibilities, such as implementing a custom {@link Converter} for XStream, or {@link XStream#alias(String,Class) registering an alias}. @author Kohsuke Kawaguchi

        getConfigFile().write(this);
        SaveableListener.fireOnChange(this, getConfigFile());
    }


    public synchronized boolean load() throws IOException {
        XmlFile config = getConfigFile();
        if (config != null && config.exists()) {
            config.unmarshal(this);
            return true;
        }
        return false;

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    }


    protected final XmlFile getConfigFile() {
        return new XmlFile(XSTREAM, new File(getRootDir(), name + "/config.xml"));
    }

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    String oldDescription = implementation.getDescription();
    boolean oldDisabled = implementation.isDisabled();
        Map<TriggerDescriptor, Trigger> oldTriggers = implementation.getTriggers();


        XmlFile implementationXmlFile = replaceConfig(template, implementation, propertiesMap);
    refreshAndSave(template, implementationBuildWrapper, implementationXmlFile, oldDescription, oldDisabled, oldTriggers);
  }

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    return patternPairsBuilder.build();
  }


  private static XmlFile replaceConfig(AbstractProject template, AbstractProject implementation, Map<Pattern, String> propertiesMap) throws IOException {
    XmlFile implementationXmlFile = implementation.getConfigFile();
    File implementationFile = implementationXmlFile.getFile();


    assert template.getConfigFile() != null : "template config file shouldn't be null";


    InputStream templateFileStream = new FileInputStream(template.getConfigFile().getFile());
    try {

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    /**
     * The file we save our configuration.
     */
    private XmlFile getConfigFile() {
        return new XmlFile(XSTREAM, new File(root,"config.xml"));
    }

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            public void run(Reactor session) throws Exception {
                // JENKINS-8043: some slaves (eg. swarm slaves) are not saved into the config file
                // and will get overwritten when reloading. Make a backup copy now, and re-add them later
                NodeList oldSlaves = slaves;
                
                XmlFile cfg = getConfigFile();
                if (cfg.exists()) {
                    // reset some data that may not exist in the disk file
                    // so that we can take a proper compensation action later.
                    primaryView = null;
                    views.clear();


                    // load from disk
                    cfg.unmarshal(Jenkins.this);
                }


                // if we are loading old data that doesn't have this field
                if (slaves == null) slaves = new NodeList();

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     * XML prior to the test code refactoring.
     * 
     * @throws Exception
     */
    public void testXmlCompatibility() throws Exception {
        XmlFile xmlFile = new XmlFile(XSTREAM, getDataFile("junitResult.xml"));
        TestResult result = (TestResult)xmlFile.read();


        // Regenerate the transient data
        result.tally();
        assertEquals(9, result.getTotalCount());
        assertEquals(1, result.getSkipCount());

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    public void testSuiteResultPersistence() throws Exception {
        SuiteResult source = parseOne(getDataFile("junit-report-1233.xml"));


        File dest = File.createTempFile("testSuiteResultPersistence", ".xml");
        try {
            XmlFile xmlFile = new XmlFile(dest);
            xmlFile.write(source);


            SuiteResult result = (SuiteResult)xmlFile.read();
            assertNotNull(result);


            assertEquals(source.getName(), result.getName());
            assertEquals(source.getTimestamp(), result.getTimestamp());
            assertEquals(source.getDuration(), result.getDuration());

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        Foo foo = new Foo();
        foo.m.put("abc","def");
        foo.m.put("ghi","jkl");
        File v = File.createTempFile("hashmap", "xml");
        try {
            new XmlFile(v).write(foo);


            // should serialize like map
            String xml = FileUtils.readFileToString(v);
            assertFalse(xml.contains("java.util.concurrent"));
            //System.out.println(xml);

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    public void testSerialization() throws Exception {
        NodeList nl = new NodeList(new DummyNode(), new EphemeralNode());


        File tmp = File.createTempFile("test","test");
        try {
            XmlFile x = new XmlFile(Jenkins.XSTREAM, tmp);
            x.write(nl);


            String xml = FileUtils.readFileToString(tmp);
            System.out.println(xml);
            assertEquals(6,xml.split("\n").length);


            NodeList back = (NodeList)x.read();


            assertEquals(1,back.size());
            assertEquals(DummyNode.class,back.get(0).getClass());
        } finally {
            tmp.delete();

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Examples of hudson.XmlFile

Evolving data format

Related Classes of hudson.XmlFile