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/**
 * A suppression buffer that only supports read operations.
 *
 * @param <K> type of the record keys
 * @param <V> type of the record values
 */
public interface ReadOnlySuppressionBuffer<K, V> extends ReadOnlyKeyValueStore<K, V> {

    /**
     * Returns suppressed view of the value associated with {@code key} with timestamp, if exists.
     * If not, returns null.
     *
     * @param key record key
     * @return Suppressed view of the value associated with given key, with timestamp (if exists)
     */
    NullableValueAndTimestamp<V> priorValueForBuffered(K key);

    /**
     * Returns the number of key/value pairs suppressed in this buffer.
     *
     * @return the number of key/value pairs suppressed in this buffer
     */
    int numRecords();

    /**
     * Returns the size of this buffer, in bytes.
     *
     * @return the size of the buffer, in bytes
     */
    long bufferSize();

    /**
     * Returns the timestamp of the oldest record in this buffer. {@link Long#MAX_VALUE} iff the buffer is empty.
     *
     * @return the timestamp of the oldest record in this buffer
     */
    long minTimestamp();
}

public final class QueryableStoreTypes {

    ...

    /**
     * A {@link QueryableStoreType} that accepts {@link ReadOnlySuppressionBuffer}.
     *
     * @param <K> key type of the store
     * @param <V> value type of the store
     * @return {@link QueryableStoreTypes.SuppressionBufferType}
     */
    public static <K, V> QueryableStoreType<ReadOnlySuppressionBuffer<K, V>> suppressionBuffer() {
        return new SuppressionBufferType<>();
    }

    ...

    
public static class SuppressionBufferType<K, V> extends QueryableStoreTypeMatcher<ReadOnlySuppressionBuffer<K, V>> {

        SuppressionBufferType() {
            super(Collections.singleton(ReadOnlySuppressionBuffer.class));
        }

        @Override
        public ReadOnlySuppressionBuffer<K, V> create(final StateStoreProvider storeProvider,
                                                      final String storeName) {
            return new CompositeReadOnlySuppressionBuffer<>(storeProvider, this, storeName);
        }
    }
}