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| |
| package org.apache.james.backends.cassandra.versions; |
| |
| import static org.apache.james.backends.cassandra.versions.CassandraSchemaVersionManager.SchemaState.TOO_OLD; |
| import static org.apache.james.backends.cassandra.versions.CassandraSchemaVersionManager.SchemaState.TOO_RECENT; |
| import static org.apache.james.backends.cassandra.versions.CassandraSchemaVersionManager.SchemaState.UPGRADABLE; |
| import static org.apache.james.backends.cassandra.versions.CassandraSchemaVersionManager.SchemaState.UP_TO_DATE; |
| |
| import jakarta.inject.Inject; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Preconditions; |
| |
| import reactor.core.publisher.Mono; |
| |
| public class CassandraSchemaVersionManager { |
| public static final SchemaVersion MIN_VERSION = new SchemaVersion(12); |
| public static final SchemaVersion MAX_VERSION = new SchemaVersion(15); |
| public static final SchemaVersion DEFAULT_VERSION = MIN_VERSION; |
| |
| private static final Logger LOGGER = LoggerFactory.getLogger(CassandraSchemaVersionManager.class); |
| |
| private final SchemaVersion minVersion; |
| private final SchemaVersion maxVersion; |
| private final SchemaVersion initialSchemaVersion; |
| private final CassandraSchemaVersionDAO schemaVersionDAO; |
| |
| public enum SchemaState { |
| UP_TO_DATE, |
| TOO_RECENT, |
| TOO_OLD, |
| UPGRADABLE |
| } |
| |
| @Inject |
| public CassandraSchemaVersionManager(CassandraSchemaVersionDAO schemaVersionDAO) { |
| this(schemaVersionDAO, MIN_VERSION, MAX_VERSION); |
| } |
| |
| @VisibleForTesting |
| public CassandraSchemaVersionManager(CassandraSchemaVersionDAO schemaVersionDAO, SchemaVersion minVersion, SchemaVersion maxVersion) { |
| Preconditions.checkArgument(maxVersion.isAfterOrEquals(minVersion), |
| "maxVersion should not be inferior to minVersion"); |
| |
| this.schemaVersionDAO = schemaVersionDAO; |
| this.minVersion = minVersion; |
| this.maxVersion = maxVersion; |
| |
| this.initialSchemaVersion = computeVersion().block(); |
| } |
| |
| public Mono<Boolean> isBefore(SchemaVersion minimum) { |
| if (initialSchemaVersion.isBefore(minimum)) { |
| // If we started with a legacy james then maybe schema version had been updated since then |
| return computeVersion() |
| .map(computedVersion -> computedVersion.isBefore(minimum)); |
| } |
| return Mono.just(false); |
| } |
| |
| public Mono<SchemaVersion> computeVersion() { |
| return schemaVersionDAO |
| .getCurrentSchemaVersion() |
| .map(maybeVersion -> maybeVersion.orElseGet(() -> { |
| LOGGER.warn("No schema version information found on Cassandra, we assume schema is at version {}", |
| CassandraSchemaVersionManager.DEFAULT_VERSION); |
| return DEFAULT_VERSION; |
| })); |
| } |
| |
| public SchemaVersion getMinimumSupportedVersion() { |
| return minVersion; |
| } |
| |
| public SchemaVersion getMaximumSupportedVersion() { |
| return maxVersion; |
| } |
| |
| public SchemaState computeSchemaState() { |
| SchemaVersion version = computeVersion().block(); |
| if (version.isBefore(minVersion)) { |
| return TOO_OLD; |
| } else if (version.isBefore(maxVersion)) { |
| return UPGRADABLE; |
| } else if (version.equals(maxVersion)) { |
| return UP_TO_DATE; |
| } else { |
| return TOO_RECENT; |
| } |
| } |
| } |