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package liquibase.snapshot;
import liquibase.CatalogAndSchema;
import liquibase.database.Database;
import liquibase.database.DatabaseConnection;
import liquibase.database.OfflineConnection;
import liquibase.database.core.PostgresDatabase;
import liquibase.diff.compare.DatabaseObjectComparatorFactory;
import liquibase.exception.DatabaseException;
import liquibase.exception.UnexpectedLiquibaseException;
import liquibase.executor.ExecutorService;
import liquibase.servicelocator.ServiceLocator;
import liquibase.statement.core.RawSqlStatement;
import liquibase.structure.DatabaseObject;
import liquibase.structure.core.Schema;
import liquibase.structure.core.Table;
import java.util.*;
public class SnapshotGeneratorFactory {
private static SnapshotGeneratorFactory instance;
private List generators = new ArrayList<>();
protected SnapshotGeneratorFactory() {
Class[] classes;
try {
classes = ServiceLocator.getInstance().findClasses(SnapshotGenerator.class);
for (Class clazz : classes) {
register((SnapshotGenerator) clazz.getConstructor().newInstance());
}
} catch (Exception e) {
throw new UnexpectedLiquibaseException(e);
}
}
/**
* Return singleton SnapshotGeneratorFactory
*/
public static synchronized SnapshotGeneratorFactory getInstance() {
if (instance == null) {
instance = new SnapshotGeneratorFactory();
}
return instance;
}
public static synchronized void reset() {
instance = new SnapshotGeneratorFactory();
}
public static synchronized void resetAll() {
instance = null;
}
public void register(SnapshotGenerator generator) {
generators.add(generator);
}
public void unregister(SnapshotGenerator generator) {
generators.remove(generator);
}
public void unregister(Class generatorClass) {
SnapshotGenerator toRemove = null;
for (SnapshotGenerator existingGenerator : generators) {
if (existingGenerator.getClass().equals(generatorClass)) {
toRemove = existingGenerator;
}
}
unregister(toRemove);
}
protected SortedSet getGenerators(Class generatorClass, Database database) {
SortedSet validGenerators = new TreeSet<>(new SnapshotGeneratorComparator(generatorClass, database));
/*
* Query all SnapshotGenerators if they consider themselves applicable for the generatorClass (e.g. a Table)
* for a specific Database (e.g. MSSQL, Oracle, Postgres...)
*/
for (SnapshotGenerator generator : generators) {
if (generator.getPriority(generatorClass, database) > 0) {
validGenerators.add(generator);
}
}
return validGenerators;
}
/**
* Checks if a specific object is present in a database
* @param example The DatabaseObject to check for existence
* @param database The DBMS in which the object might exist
* @return true if object existence can be confirmed, false otherweise
* @throws DatabaseException If a problem occurs in the DBMS-specific code
* @throws InvalidExampleException If the object cannot be checked properly, e.g. if the object name is ambiguous
*/
public boolean has(DatabaseObject example, Database database) throws DatabaseException, InvalidExampleException {
// @todo I have seen duplicates in types - maybe convert the List into a Set? Need to understand it more thoroughly.
List> types = new ArrayList<>(getContainerTypes(example.getClass(), database));
types.add(example.getClass());
/*
* Does the query concern the DATABASECHANGELOG / DATABASECHANGELOGLOCK table? If so, we do a quick & dirty
* SELECT COUNT(*) on that table. If that works, we count that as confirmation of existence.
*/
// @todo Actually, there may be extreme cases (distorted table statistics etc.) where a COUNT(*) might not be so cheap. Maybe SELECT a dummy constant is the better way?
if ((example instanceof Table) && (example.getName().equals(database.getDatabaseChangeLogTableName()) ||
example.getName().equals(database.getDatabaseChangeLogLockTableName()))) {
try {
ExecutorService.getInstance().getExecutor(database).queryForInt(
new RawSqlStatement("SELECT COUNT(*) FROM " +
database.escapeObjectName(database.getLiquibaseCatalogName(),
database.getLiquibaseSchemaName(), example.getName(), Table.class)));
return true;
} catch (DatabaseException e) {
if (database instanceof PostgresDatabase) { // throws "current transaction is aborted" unless we roll back the connection
database.rollback();
}
return false;
}
}
/*
* If the query is about another object, try to create a snapshot of the of the object (or used the cached
* snapshot. If that works, we count that as confirmation of existence.
*/
SnapshotControl snapshotControl = (new SnapshotControl(database, false, types.toArray(new Class[types.size()])));
snapshotControl.setWarnIfObjectNotFound(false);
if (createSnapshot(example, database,snapshotControl) != null) {
return true;
}
CatalogAndSchema catalogAndSchema;
if (example.getSchema() == null) {
catalogAndSchema = database.getDefaultSchema();
} else {
catalogAndSchema = example.getSchema().toCatalogAndSchema();
}
DatabaseSnapshot snapshot = createSnapshot(catalogAndSchema, database,
new SnapshotControl(database, false, example.getClass()).setWarnIfObjectNotFound(false)
);
for (DatabaseObject obj : snapshot.get(example.getClass())) {
if (DatabaseObjectComparatorFactory.getInstance().isSameObject(example, obj, null, database)) {
return true;
}
}
return false;
}
public DatabaseSnapshot createSnapshot(CatalogAndSchema example, Database database, SnapshotControl snapshotControl) throws DatabaseException, InvalidExampleException {
return createSnapshot(new CatalogAndSchema[] {example}, database, snapshotControl);
}
/**
* Creates a database snapshot for a given array of catalog/schema combinations.
*
* @param examples an array of CatalogAndSchema objects
* @param database the database to work on
* @param snapshotControl the options/settings for snapshot generation
* @return a database snapshot that includes all objects matching the specification
* @throws DatabaseException if a problem occurs during snapshotting
* @throws InvalidExampleException if the given catalog/schema combinations are invalid (e.g. duplicates)
*/
public DatabaseSnapshot createSnapshot(CatalogAndSchema[] examples, Database database,
SnapshotControl snapshotControl)
throws DatabaseException, InvalidExampleException {
if (database == null) {
return null;
}
/*
* Translate the given examples into "real" Schema objects according to the database's abilities (e.g.
* does the DB support catalogs? schemas? are the given schema/catalog names the default ones for the
* DB connection?)
*/
Schema[] schemas = new Schema[examples.length];
for (int i = 0; i< schemas.length; i++) {
examples[i] = examples[i].customize(database);
schemas[i] = new Schema(examples[i].getCatalogName(), examples[i].getSchemaName());
}
return createSnapshot(schemas, database, snapshotControl);
}
/**
* Creates a database snapshot for a given array of DatabaseObjects
*
* @param examples an array of DatabaseObjects objects
* @param database the database to work on
* @param snapshotControl the options/settings for snapshot generation
* @return a database snapshot that includes all objects matching the specification
* @throws DatabaseException if a problem occurs during snapshotting
* @throws InvalidExampleException if the given catalog/schema combinations are invalid (e.g. duplicates)
*/
public DatabaseSnapshot createSnapshot(DatabaseObject[] examples, Database database,
SnapshotControl snapshotControl)
throws DatabaseException, InvalidExampleException {
DatabaseConnection conn = database.getConnection();
if (conn == null) {
return new EmptyDatabaseSnapshot(database, snapshotControl);
}
if (conn instanceof OfflineConnection) {
DatabaseSnapshot snapshot = ((OfflineConnection) conn).getSnapshot(examples);
if (snapshot == null) {
throw new DatabaseException("No snapshotFile parameter specified for offline database");
}
return snapshot;
}
return new JdbcDatabaseSnapshot(examples, database, snapshotControl);
}
/**
* Creates a DatabaseSnapshot for a single DatabaseObject.
* @param example the object to snapshot
* @param database the database to work on
* @param the type of the object (must extend DatabaseObject)
* @return the snapshot of the desired object
* @throws DatabaseException if a problem occurs during snapshotting
* @throws InvalidExampleException if the given catalog/schema combinations are invalid (e.g. duplicates)
*/
public T createSnapshot(T example, Database database) throws DatabaseException, InvalidExampleException {
return createSnapshot(example, database, new SnapshotControl(database));
}
/**
*
* Creates a DatabaseSnapshot for a single DatabaseObject.
* @param example the object to snapshot
* @param database the database to work on
* @param snapshotControl the options/settings for snapshot generation
* @param the type of the object (must extend DatabaseObject)
* @return the snapshot of the desired object
* @throws DatabaseException if a problem occurs during snapshotting
* @throws InvalidExampleException if the given catalog/schema combinations are invalid (e.g. duplicates)
*/
public T createSnapshot(T example, Database database, SnapshotControl snapshotControl)
throws DatabaseException, InvalidExampleException {
DatabaseSnapshot snapshot = createSnapshot(new DatabaseObject[]{example}, database, snapshotControl);
return snapshot.get(example);
}
public Table getDatabaseChangeLogTable(SnapshotControl snapshotControl, Database database) throws DatabaseException {
try {
Table liquibaseTable = (Table) new Table().setName(database.getDatabaseChangeLogTableName()).setSchema(
new Schema(database.getLiquibaseCatalogName(), database.getLiquibaseSchemaName()));
return createSnapshot(liquibaseTable, database, snapshotControl);
} catch (InvalidExampleException e) {
throw new UnexpectedLiquibaseException(e);
}
}
public Table getDatabaseChangeLogLockTable(Database database) throws DatabaseException {
try {
Table example = (Table) new Table().setName(database.getDatabaseChangeLogLockTableName()).setSchema(
new Schema(database.getLiquibaseCatalogName(), database.getLiquibaseSchemaName()));
return createSnapshot(example, database);
} catch (InvalidExampleException e) {
throw new UnexpectedLiquibaseException(e);
}
}
public boolean hasDatabaseChangeLogTable(Database database) throws DatabaseException {
try {
return has(new Table().setName(database.getDatabaseChangeLogTableName()).setSchema(new Schema(
database.getLiquibaseCatalogName(), database.getLiquibaseSchemaName())), database);
} catch (InvalidExampleException e) {
throw new UnexpectedLiquibaseException(e);
}
}
public boolean hasDatabaseChangeLogLockTable(Database database) throws DatabaseException {
try {
return has(new Table().setName(database.getDatabaseChangeLogLockTableName()).setSchema(
new Schema(database.getLiquibaseCatalogName(), database.getLiquibaseSchemaName())), database);
} catch (InvalidExampleException e) {
throw new UnexpectedLiquibaseException(e);
}
}
public Set> getContainerTypes(Class type,
Database database) {
Set> returnSet = new HashSet<>();
getContainerTypes(type, database, returnSet);
return returnSet;
}
private void getContainerTypes(Class type, Database database,
Set> returnSet) {
Class[] addsTo;
// Have we already seen this type?
if (!returnSet.add(type)) {
return;
}
// Get a list of the SnapshotGenerators that are in charge of snapshotting
// object type "type" in the DBMS "database"
SortedSet generators = getGenerators(type, database);
if ((generators != null) && !generators.isEmpty()) {
SnapshotGenerator generator = generators.iterator().next();
addsTo = generator.addsTo();
if (addsTo != null) {
for (Class newType : addsTo) {
returnSet.add(newType);
getContainerTypes(newType, database, returnSet);
}
}
}
}
}
