HudiSchemaCacheKey.java

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//   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.doris.datasource.hudi;

import org.apache.doris.datasource.ExternalSchemaCache.SchemaCacheKey;

import com.google.common.base.Objects;

/**
 * Cache key for Hudi table schemas that includes timestamp information.
 * This allows for time-travel queries and ensures proper schema versioning.
 */
public class HudiSchemaCacheKey extends SchemaCacheKey {
    private final long timestamp;

    /**
     * Creates a new cache key for Hudi table schemas.
     *
     * @param dbName The database name
     * @param tableName The table name
     * @param timestamp The timestamp for schema version
     * @throws IllegalArgumentException if dbName or tableName is null or empty
     */
    public HudiSchemaCacheKey(String dbName, String tableName, long timestamp) {
        super(dbName, tableName);
        if (timestamp < 0) {
            throw new IllegalArgumentException("Timestamp cannot be negative");
        }
        this.timestamp = timestamp;
    }

    /**
     * Gets the timestamp associated with this schema version.
     *
     * @return the timestamp value
     */
    public long getTimestamp() {
        return timestamp;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        if (!super.equals(o)) {
            return false;
        }

        HudiSchemaCacheKey that = (HudiSchemaCacheKey) o;
        return timestamp == that.timestamp;
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(super.hashCode(), timestamp);
    }

    @Override
    public String toString() {
        return String.format("HudiSchemaCacheKey{dbName='%s', tableName='%s', timestamp=%d}",
                getDbName(), getTblName(), timestamp);
    }
}