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| * software distributed under the License is distributed on an * |
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| * specific language governing permissions and limitations * |
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| ****************************************************************/ |
| |
| package org.apache.james.backends.cassandra.migration; |
| |
| import static org.apache.james.backends.cassandra.versions.CassandraSchemaVersionManager.DEFAULT_VERSION; |
| |
| import java.time.Clock; |
| import java.time.Instant; |
| import java.util.Optional; |
| |
| import javax.inject.Inject; |
| |
| import org.apache.james.backends.cassandra.versions.CassandraSchemaVersionDAO; |
| import org.apache.james.backends.cassandra.versions.SchemaTransition; |
| import org.apache.james.backends.cassandra.versions.SchemaVersion; |
| import org.apache.james.task.Task; |
| import org.apache.james.task.TaskExecutionDetails; |
| import org.apache.james.task.TaskType; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.github.fge.lambdas.Throwing; |
| import com.google.common.annotations.VisibleForTesting; |
| import reactor.util.function.Tuple2; |
| import reactor.util.function.Tuples; |
| |
| public class MigrationTask implements Task { |
| |
| public interface Factory { |
| MigrationTask create(SchemaVersion target); |
| } |
| |
| public static class Impl implements Factory { |
| private final CassandraSchemaVersionDAO schemaVersionDAO; |
| private final CassandraSchemaTransitions transitions; |
| |
| @Inject |
| private Impl(CassandraSchemaVersionDAO schemaVersionDAO, CassandraSchemaTransitions transitions) { |
| this.schemaVersionDAO = schemaVersionDAO; |
| this.transitions = transitions; |
| } |
| |
| @Override |
| public MigrationTask create(SchemaVersion target) { |
| return new MigrationTask(schemaVersionDAO, transitions, target); |
| } |
| } |
| |
| private static final Logger LOGGER = LoggerFactory.getLogger(MigrationTask.class); |
| |
| public static final TaskType CASSANDRA_MIGRATION = TaskType.of("CassandraMigration"); |
| |
| public static class AdditionalInformations implements TaskExecutionDetails.AdditionalInformation { |
| |
| private final SchemaVersion toVersion; |
| private final Instant timestamp; |
| |
| public AdditionalInformations(SchemaVersion toVersion, Instant timestamp) { |
| this.toVersion = toVersion; |
| this.timestamp = timestamp; |
| } |
| |
| public int getToVersion() { |
| return toVersion.getValue(); |
| } |
| |
| @Override |
| public Instant timestamp() { |
| return timestamp; |
| } |
| } |
| |
| private final CassandraSchemaVersionDAO schemaVersionDAO; |
| private final CassandraSchemaTransitions transitions; |
| private final SchemaVersion target; |
| |
| @VisibleForTesting |
| public MigrationTask(CassandraSchemaVersionDAO schemaVersionDAO, CassandraSchemaTransitions transitions, SchemaVersion target) { |
| this.schemaVersionDAO = schemaVersionDAO; |
| this.transitions = transitions; |
| this.target = target; |
| } |
| |
| @Override |
| public Result run() { |
| getCurrentVersion().listTransitionsForTarget(target) |
| .stream() |
| .map(this::migration) |
| .forEach(Throwing.consumer(this::runMigration).sneakyThrow()); |
| return Result.COMPLETED; |
| } |
| |
| private SchemaVersion getCurrentVersion() { |
| return schemaVersionDAO.getCurrentSchemaVersion().block().orElse(DEFAULT_VERSION); |
| } |
| |
| private Tuple2<SchemaTransition, Migration> migration(SchemaTransition transition) { |
| return Tuples.of( |
| transition, |
| transitions.findMigration(transition) |
| .orElseThrow(() -> new MigrationException("unable to find a required Migration for transition " + transition))); |
| } |
| |
| private void runMigration(Tuple2<SchemaTransition, Migration> tuple) throws InterruptedException { |
| SchemaVersion currentVersion = getCurrentVersion(); |
| SchemaTransition transition = tuple.getT1(); |
| SchemaVersion targetVersion = transition.to(); |
| if (currentVersion.isAfterOrEquals(targetVersion)) { |
| return; |
| } |
| |
| LOGGER.info("Migrating to version {} ", transition.toAsString()); |
| Migration migration = tuple.getT2(); |
| migration.asTask().run() |
| .onComplete( |
| () -> schemaVersionDAO.updateVersion(transition.to()).block(), |
| () -> LOGGER.info("Migrating to version {} done", transition.toAsString())) |
| .onFailure( |
| () -> LOGGER.warn(failureMessage(transition.to())), |
| () -> throwMigrationException(transition.to())); |
| } |
| |
| private void throwMigrationException(SchemaVersion newVersion) { |
| throw new MigrationException(failureMessage(newVersion)); |
| } |
| |
| private String failureMessage(SchemaVersion newVersion) { |
| return String.format("Migrating to version %d partially done. " + |
| "Please check logs for cause of failure and re-run this migration.", newVersion.getValue()); |
| } |
| |
| SchemaVersion getTarget() { |
| return target; |
| } |
| |
| @Override |
| public TaskType type() { |
| return CASSANDRA_MIGRATION; |
| } |
| |
| @Override |
| public Optional<TaskExecutionDetails.AdditionalInformation> details() { |
| return Optional.of(new AdditionalInformations(target, Clock.systemUTC().instant())); |
| } |
| |
| } |