public static void copy(IMetaStore from, IMetaStore to, boolean overwrite)
throws MetaStoreException {
// get all of the namespace in the "from" metastore
List<String> namespaces = from.getNamespaces();
for (String namespace : namespaces) {
// create the sme namespace in the "to" metastore
try {
to.createNamespace(namespace);
} catch (MetaStoreNamespaceExistsException e) {
// already there
}
// get all of the element types defined in this namespace
List<IMetaStoreElementType> elementTypes = from.getElementTypes(namespace);
for (IMetaStoreElementType elementType : elementTypes) {
// See if it's already there
IMetaStoreElementType existingType =
to.getElementTypeByName(namespace, elementType.getName());
if (existingType != null) {
if (overwrite) {
// we looked it up by name, but need to update it by id
elementType.setId(existingType.getId());
to.updateElementType(namespace, elementType);
} else {
elementType = existingType;
}
} else {
// create the elementType in the "to" metastore
to.createElementType(namespace, elementType);
}
// get all of the elements defined for this type
List<IMetaStoreElement> elements = from.getElements(namespace, elementType);
for (IMetaStoreElement element : elements) {
IMetaStoreElement existingElement =
to.getElementByName(namespace, elementType, element.getName());
if (existingElement != null) {
element.setId(existingElement.getId());
if (overwrite) {
to.updateElement(namespace, elementType, existingElement.getId(), element);
}
} else {
to.createElement(namespace, elementType, element);
}
}
}
}
}
/**
* Get a sorted list of element names for the specified element type in the given namespace.
*
* @param namespace
* @param metaStore
* @param elementType
* @return
* @throws MetaStoreException
*/
public String[] getElementNames(
String namespace, IMetaStore metaStore, IMetaStoreElementType elementType)
throws MetaStoreException {
List<String> names = new ArrayList<String>();
List<IMetaStoreElement> elements = metaStore.getElements(namespace, elementType);
for (IMetaStoreElement element : elements) {
names.add(element.getName());
}
// Alphabetical sort
//
Collections.sort(names);
return names.toArray(new String[names.size()]);
}
@Test
public void testIDMigration() throws Exception {
String namespace = "custom";
String stepName = "Step Name";
String elementName = "migration";
String hostName = "Host Name";
String fieldMappings = "Field Mappings";
String sourceFieldName = "Source Field Name";
String targetFieldName = "Target Field Name";
String parameterName = "Parameter Name";
IMetaStore metaStore = new MemoryMetaStore();
MetaStoreFactory<MyMigrationElement> factory =
new MetaStoreFactory<MyMigrationElement>(MyMigrationElement.class, metaStore, namespace);
if (!metaStore.namespaceExists(namespace)) {
metaStore.createNamespace(namespace);
}
MetaStoreElementType elementTypeAnnotation =
MyMigrationElement.class.getAnnotation(MetaStoreElementType.class);
// Make sure the element type exists...
IMetaStoreElementType elementType =
metaStore.getElementTypeByName(namespace, elementTypeAnnotation.name());
if (elementType == null) {
elementType = metaStore.newElementType(namespace);
elementType.setName(elementTypeAnnotation.name());
elementType.setDescription(elementTypeAnnotation.description());
metaStore.createElementType(namespace, elementType);
}
// Create an element with the old keys we want to migrate
IMetaStoreElement element = metaStore.newElement();
element.setName(elementName);
element.setElementType(elementType);
element.addChild(metaStore.newAttribute("stepName", stepName));
element.addChild(metaStore.newAttribute("hostname", hostName));
element.addChild(metaStore.newAttribute("fieldMappings", fieldMappings));
element.addChild(metaStore.newAttribute("sourceFieldName", sourceFieldName));
element.addChild(metaStore.newAttribute("targetFieldName", targetFieldName));
element.addChild(metaStore.newAttribute("parameterName", parameterName));
metaStore.createElement(namespace, elementType, element);
MyMigrationElement loadedElement = factory.loadElement(elementName);
assertNotNull(loadedElement);
assertEquals(loadedElement.getStepName(), stepName);
assertEquals(loadedElement.getHostname(), hostName);
assertEquals(loadedElement.getFieldMappings(), fieldMappings);
assertEquals(loadedElement.getSourceFieldName(), sourceFieldName);
assertEquals(loadedElement.getTargetFieldName(), targetFieldName);
assertEquals(loadedElement.getParameterName(), parameterName);
// Test the variation of the step name id
element = metaStore.newElement();
element.setName(elementName);
element.setElementType(elementType);
element.addChild(metaStore.newAttribute("stepname", stepName));
metaStore.createElement(namespace, elementType, element);
loadedElement = factory.loadElement(elementName);
assertNotNull(loadedElement);
assertEquals(loadedElement.getStepname(), stepName);
}
@Test
public void testMyElement() throws Exception {
IMetaStore metaStore = new MemoryMetaStore();
// List of named elements...
//
List<MyNameElement> nameList = new ArrayList<MyNameElement>();
for (int i = 0; i < NR_NAME; i++) {
nameList.add(new MyNameElement("name" + i, "description" + i, "color" + i));
}
List<MyFilenameElement> filenameList = new ArrayList<MyFilenameElement>();
for (int i = 0; i < NR_FILENAME; i++) {
filenameList.add(new MyFilenameElement("filename" + i, "size" + i, "gender" + i));
}
// Construct our test element...
//
MyElement me = new MyElement(NAME, ATTR, ANOTHER, PASSWORD, INT, LONG, BOOL, DATE);
for (int i = 0; i < NR_ATTR; i++) {
me.getSubAttributes().add(new MyElementAttr("key" + i, "value" + i, "desc" + i));
}
me.setNameElement(nameList.get(NR_NAME - 1));
me.setFilenameElement(filenameList.get(NR_FILENAME - 1));
List<String> stringList = Arrays.asList("a", "b", "c", "d");
me.setStringList(stringList);
MyOtherElement myOtherElement = new MyOtherElement("other", "other attribute");
me.setMyOtherElement(myOtherElement);
MetaStoreFactory<MyOtherElement> otherFactory =
new MetaStoreFactory<MyOtherElement>(MyOtherElement.class, metaStore, "custom");
MetaStoreFactory<MyElement> factory =
new MetaStoreFactory<MyElement>(MyElement.class, metaStore, "custom");
// For loading, specify the name, filename lists or factory that we're referencing...
//
factory.addNameList(MyElement.LIST_KEY_MY_NAMES, nameList);
factory.addFilenameList(MyElement.LIST_KEY_MY_FILENAMES, filenameList);
factory.addNameFactory(MyElement.FACTORY_OTHER_ELEMENT, otherFactory);
// Store the class in the meta store
//
factory.saveElement(me);
// Load the class from the meta store
//
MyElement verify = factory.loadElement(NAME);
// Verify list element details...
//
IMetaStoreElement element =
metaStore.getElementByName("custom", factory.getElementType(), NAME);
assertNotNull(element);
// Verify the general idea
//
assertNotNull(verify);
assertEquals(ATTR, verify.getMyAttribute());
assertEquals(ANOTHER, verify.getAnotherAttribute());
assertEquals(PASSWORD, verify.getPasswordAttribute());
assertEquals(INT, verify.getIntAttribute());
assertEquals(LONG, verify.getLongAttribute());
assertEquals(BOOL, verify.isBoolAttribute());
assertEquals(DATE, verify.getDateAttribute());
assertEquals(me.getSubAttributes().size(), verify.getSubAttributes().size());
assertEquals(me.getNameElement(), verify.getNameElement());
assertEquals(me.getFilenameElement(), verify.getFilenameElement());
// verify the details...
//
assertTrue(metaStore.namespaceExists("custom"));
IMetaStoreElementType elementType = factory.getElementType();
assertNotNull(elementType);
assertEquals("My element type", elementType.getName());
assertEquals("This is my element type", elementType.getDescription());
assertNotNull(element);
IMetaStoreAttribute child = element.getChild("my_attribute");
assertNotNull(child);
assertEquals(ATTR, MetaStoreUtil.getAttributeString(child));
child = element.getChild("passwordAttribute");
assertNotNull(child);
assertNotSame(
"Password needs to be encoded", PASSWORD, MetaStoreUtil.getAttributeString(child));
child = element.getChild("anotherAttribute");
assertNotNull(child);
assertEquals(ANOTHER, MetaStoreUtil.getAttributeString(child));
// Verify the child attributes as well...
// This also verifies that the attributes are in the right order.
// The list can't be re-ordered after loading.
//
for (int i = 0; i < NR_ATTR; i++) {
MyElementAttr attr = verify.getSubAttributes().get(i);
assertEquals("key" + i, attr.getKey());
assertEquals("value" + i, attr.getValue());
assertEquals("desc" + i, attr.getDescription());
}
// Verify the referenced MyOtherElement
//
MyOtherElement verifyOtherElement = verify.getMyOtherElement();
assertNotNull(verifyOtherElement);
assertEquals(myOtherElement.getName(), verifyOtherElement.getName());
assertEquals(myOtherElement.getSomeAttribute(), verifyOtherElement.getSomeAttribute());
// verify that the String list is loaded...
List<String> verifyList = verify.getStringList();
assertEquals(stringList.size(), verifyList.size());
for (int i = 0; i < stringList.size(); i++) {
assertEquals(stringList.get(i), verifyList.get(i));
}
List<String> names = factory.getElementNames();
assertEquals(1, names.size());
assertEquals(NAME, names.get(0));
List<MyElement> list = factory.getElements();
assertEquals(1, list.size());
assertEquals(NAME, list.get(0).getName());
factory.deleteElement(NAME);
assertEquals(0, factory.getElementNames().size());
assertEquals(0, factory.getElements().size());
}
/**
* Create the specified namespace if it doesn't exist.
*
* @param metaStore
* @param namespace
* @throws MetaStoreException
*/
public static void verifyNamespaceCreated(IMetaStore metaStore, String namespace)
throws MetaStoreException {
if (!metaStore.namespaceExists(namespace)) {
metaStore.createNamespace(namespace);
}
}
