SHA256
13 01 25
Запрос подписок, но это версия уже не актуальна тк дальше буду переделывать блоки под новый формат
This commit is contained in:
AidarKC
@@ -0,0 +1,251 @@
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package shine.db.dao;
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import shine.db.MsgSubType;
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import shine.db.SqliteDbController;
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import java.sql.*;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* SubscriptionsDAO — агрегатный DAO для "каналов" (подписок).
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*
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* Возвращает по каждой активной подписке (FOLLOW) + "сам на себя":
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* - login цели (channelLogin)
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* - blockchainName цели (channelBchName)
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* - count публикаций (TEXT_NEW)
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* - last publication: bytes оригинального блока (для timestamp)
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* - last publication: bytes актуального блока (edit или orig) — для текста превью
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*
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* Важно:
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* - это НЕ таблица => сущность результата хранится вложенным классом.
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* - методы с Connection НЕ закрывают соединение
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* - методы без Connection сами открывают и закрывают соединение
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*/
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public final class SubscriptionsDAO {
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private static volatile SubscriptionsDAO instance;
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private final SqliteDbController db = SqliteDbController.getInstance();
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private SubscriptionsDAO() {}
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public static SubscriptionsDAO getInstance() {
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if (instance == null) {
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synchronized (SubscriptionsDAO.class) {
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if (instance == null) instance = new SubscriptionsDAO();
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}
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}
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return instance;
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}
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/** Результат одной строки ("канал") для подписок. */
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public static final class ChannelRow {
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private final String channelLogin;
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private final String channelBchName;
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private final int publicationsCount;
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/** Последняя публикация: global number (nullable если публикаций нет). */
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private final Integer lastPublicationGlobalNumber;
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/** Байты оригинальной публикации (FULL bytes блока) — для timestamp (nullable). */
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private final byte[] lastPublicationBlockBytes;
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/** Если публикация редактировалась: global number edit-блока (nullable). */
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private final Integer lastEditGlobalNumber;
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/** Байты edit-блока (FULL bytes блока) (nullable). */
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private final byte[] lastEditBlockBytes;
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public ChannelRow(String channelLogin,
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String channelBchName,
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int publicationsCount,
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Integer lastPublicationGlobalNumber,
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byte[] lastPublicationBlockBytes,
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Integer lastEditGlobalNumber,
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byte[] lastEditBlockBytes) {
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this.channelLogin = channelLogin;
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this.channelBchName = channelBchName;
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this.publicationsCount = publicationsCount;
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this.lastPublicationGlobalNumber = lastPublicationGlobalNumber;
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this.lastPublicationBlockBytes = lastPublicationBlockBytes;
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this.lastEditGlobalNumber = lastEditGlobalNumber;
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this.lastEditBlockBytes = lastEditBlockBytes;
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}
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public String getChannelLogin() { return channelLogin; }
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public String getChannelBchName() { return channelBchName; }
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public int getPublicationsCount() { return publicationsCount; }
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public Integer getLastPublicationGlobalNumber() { return lastPublicationGlobalNumber; }
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public byte[] getLastPublicationBlockBytes() { return lastPublicationBlockBytes; }
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public Integer getLastEditGlobalNumber() { return lastEditGlobalNumber; }
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public byte[] getLastEditBlockBytes() { return lastEditBlockBytes; }
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}
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// В проекте msg_type=1 означает TEXT (у тебя это уже зафиксировано).
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private static final int MSG_TYPE_TEXT = 1;
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/**
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* Получить список подписок (активные FOLLOW) + "сам на себя" и по каждой:
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* - count публикаций (TEXT_NEW)
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* - последнюю публикацию (orig bytes) + её edit (если есть)
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*
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* Поведение при 0 публикаций:
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* - publications_count = 0
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* - last_pub_* = NULL
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* - last_edit_* = NULL
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*/
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public List<ChannelRow> getSubscribedChannels(Connection c, String requesterLogin) throws SQLException {
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String sql = """
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WITH subs AS (
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-- 1) FOLLOW-каналы
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SELECT
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cs.to_login AS channel_login,
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cs.to_bch_name AS channel_bch_name
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FROM connections_state cs
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WHERE cs.login = ?
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AND cs.rel_type = ?
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UNION
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-- 2) self: все блокчейны пользователя (если их несколько)
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SELECT
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bs.login AS channel_login,
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bs.blockchain_name AS channel_bch_name
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FROM blockchain_state bs
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WHERE bs.login = ?
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),
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pub_counts AS (
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SELECT
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b.login AS channel_login,
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b.bch_name AS channel_bch_name,
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COUNT(*) AS publications_count
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FROM blocks b
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JOIN subs s
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ON s.channel_login = b.login
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AND s.channel_bch_name = b.bch_name
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WHERE b.msg_type = ?
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AND b.msg_sub_type = ?
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GROUP BY b.login, b.bch_name
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),
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last_pub AS (
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SELECT
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b.login AS channel_login,
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b.bch_name AS channel_bch_name,
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MAX(b.block_global_number) AS last_pub_global_number
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FROM blocks b
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JOIN subs s
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ON s.channel_login = b.login
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AND s.channel_bch_name = b.bch_name
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WHERE b.msg_type = ?
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AND b.msg_sub_type = ?
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GROUP BY b.login, b.bch_name
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),
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last_pub_block AS (
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SELECT
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b.login AS channel_login,
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b.bch_name AS channel_bch_name,
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b.block_global_number AS last_pub_global_number,
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b.block_byte AS last_pub_block_bytes,
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b.edited_by_block_global_number AS last_edit_global_number
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FROM blocks b
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JOIN last_pub lp
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ON lp.channel_login = b.login
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AND lp.channel_bch_name = b.bch_name
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AND lp.last_pub_global_number = b.block_global_number
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),
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last_edit_block AS (
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SELECT
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e.login AS channel_login,
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e.bch_name AS channel_bch_name,
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e.block_global_number AS last_edit_global_number,
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e.block_byte AS last_edit_block_bytes
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FROM blocks e
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JOIN last_pub_block p
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ON p.channel_login = e.login
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AND p.channel_bch_name = e.bch_name
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AND p.last_edit_global_number = e.block_global_number
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)
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SELECT
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s.channel_login,
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s.channel_bch_name,
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COALESCE(pc.publications_count, 0) AS publications_count,
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p.last_pub_global_number,
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p.last_pub_block_bytes,
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p.last_edit_global_number,
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e.last_edit_block_bytes
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FROM subs s
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LEFT JOIN pub_counts pc
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ON pc.channel_login = s.channel_login
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AND pc.channel_bch_name = s.channel_bch_name
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LEFT JOIN last_pub_block p
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ON p.channel_login = s.channel_login
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AND p.channel_bch_name = s.channel_bch_name
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LEFT JOIN last_edit_block e
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ON e.channel_login = s.channel_login
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AND e.channel_bch_name = s.channel_bch_name
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ORDER BY s.channel_login, s.channel_bch_name
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""";
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List<ChannelRow> out = new ArrayList<>();
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try (PreparedStatement ps = c.prepareStatement(sql)) {
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int i = 1;
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// FOLLOW
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ps.setString(i++, requesterLogin);
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ps.setInt(i++, (int) MsgSubType.CONNECTION_FOLLOW);
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// self
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ps.setString(i++, requesterLogin);
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// pub_counts
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ps.setInt(i++, MSG_TYPE_TEXT);
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ps.setInt(i++, (int) MsgSubType.TEXT_NEW);
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// last_pub
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ps.setInt(i++, MSG_TYPE_TEXT);
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ps.setInt(i++, (int) MsgSubType.TEXT_NEW);
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try (ResultSet rs = ps.executeQuery()) {
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while (rs.next()) {
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String channelLogin = rs.getString("channel_login");
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String channelBchName = rs.getString("channel_bch_name");
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int publicationsCount = rs.getInt("publications_count");
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Integer lastPubGn = (Integer) rs.getObject("last_pub_global_number");
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byte[] lastPubBytes = rs.getBytes("last_pub_block_bytes");
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Integer lastEditGn = (Integer) rs.getObject("last_edit_global_number");
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byte[] lastEditBytes = rs.getBytes("last_edit_block_bytes");
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out.add(new ChannelRow(
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channelLogin,
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channelBchName,
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publicationsCount,
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lastPubGn,
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lastPubBytes,
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lastEditGn,
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lastEditBytes
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));
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}
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}
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}
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return out;
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}
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/** Вариант без внешнего соединения. Сам открывает/закрывает. */
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public List<ChannelRow> getSubscribedChannels(String requesterLogin) throws SQLException {
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try (Connection c = db.getConnection()) {
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return getSubscribedChannels(c, requesterLogin);
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}
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}
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}
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