Extract public API to api package

- Use strongly typed interfaces
- Standardize R2DBC driver MySQL-specific API

r2dbc-mysql/src/main/java/io/asyncer/r2dbc/mysql/ConnectionState.java

@@ -31,7 +31,7 @@ interface ConnectionState {
     void setIsolationLevel(IsolationLevel level);
 
     /**
-     * Reutrns session lock wait timeout.
+     * Returns session lock wait timeout.
      *
      * @return Session lock wait timeout.
      */

r2dbc-mysql/src/main/java/io/asyncer/r2dbc/mysql/ConsistentSnapshotEngine.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2023 asyncer.io projects
+ * Copyright 2024 asyncer.io projects
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,7 +19,12 @@
 /**
  * The engine of {@code START TRANSACTION WITH CONSISTENT [engine] SNAPSHOT} for Facebook/MySQL or similar
  * syntax.
+ *
+ * @deprecated use directly {@link String} instead, e.g. {@code "ROCKSDB"}
+ * @see io.asyncer.r2dbc.mysql.api.MySqlTransactionDefinition#consistent(String)
+ * @see io.asyncer.r2dbc.mysql.api.MySqlTransactionDefinition#consistent(String, long)
  */
+@Deprecated
 public enum ConsistentSnapshotEngine {
 
     ROCKSDB,

r2dbc-mysql/src/main/java/io/asyncer/r2dbc/mysql/InsertSyntheticRow.java

@@ -16,7 +16,13 @@
 
 package io.asyncer.r2dbc.mysql;
 
+import io.asyncer.r2dbc.mysql.api.MySqlColumnMetadata;
+import io.asyncer.r2dbc.mysql.api.MySqlRow;
+import io.asyncer.r2dbc.mysql.api.MySqlRowMetadata;
+import io.asyncer.r2dbc.mysql.api.MySqlStatement;
+import io.asyncer.r2dbc.mysql.codec.CodecContext;
 import io.asyncer.r2dbc.mysql.codec.Codecs;
+import io.asyncer.r2dbc.mysql.collation.CharCollation;
 import io.asyncer.r2dbc.mysql.constant.MySqlType;
 import io.r2dbc.spi.ColumnMetadata;
 import io.r2dbc.spi.Nullability;
@@ -37,7 +43,7 @@
  *
  * @see MySqlStatement#returnGeneratedValues(String...) reading last inserted ID.
  */
-final class InsertSyntheticRow implements Row, RowMetadata, ColumnMetadata {
+final class InsertSyntheticRow implements MySqlRow, MySqlRowMetadata, MySqlColumnMetadata {
 
     private final Codecs codecs;
 
@@ -96,27 +102,27 @@ public boolean contains(String name) {
     }
 
     @Override
-    public RowMetadata getMetadata() {
+    public MySqlRowMetadata getMetadata() {
         return this;
     }
 
     @Override
-    public ColumnMetadata getColumnMetadata(int index) {
+    public MySqlColumnMetadata getColumnMetadata(int index) {
         assertValidIndex(index);
 
         return this;
     }
 
     @Override
-    public ColumnMetadata getColumnMetadata(String name) {
+    public MySqlColumnMetadata getColumnMetadata(String name) {
         requireNonNull(name, "name must not be null");
         assertValidName(name);
 
         return this;
     }
 
     @Override
-    public List<ColumnMetadata> getColumnMetadatas() {
+    public List<MySqlColumnMetadata> getColumnMetadatas() {
         return Collections.singletonList(this);
     }
 
@@ -125,6 +131,11 @@ public MySqlType getType() {
         return lastInsertId < 0 ? MySqlType.BIGINT_UNSIGNED : MySqlType.BIGINT;
     }
 
+    @Override
+    public CharCollation getCharCollation(CodecContext context) {
+        return context.getClientCollation();
+    }
+
     @Override
     public String getName() {
         return keyName;

r2dbc-mysql/src/main/java/io/asyncer/r2dbc/mysql/MySqlBatchingBatch.java

@@ -16,6 +16,8 @@
 
 package io.asyncer.r2dbc.mysql;
 
+import io.asyncer.r2dbc.mysql.api.MySqlBatch;
+import io.asyncer.r2dbc.mysql.api.MySqlResult;
 import io.asyncer.r2dbc.mysql.client.Client;
 import io.asyncer.r2dbc.mysql.codec.Codecs;
 import reactor.core.publisher.Flux;
@@ -28,7 +30,7 @@
  * An implementation of {@link MySqlBatch} for executing a collection of statements in a batch against the
  * MySQL database.
  */
-final class MySqlBatchingBatch extends MySqlBatch {
+final class MySqlBatchingBatch implements MySqlBatch {
 
     private final Client client;
 
@@ -63,7 +65,7 @@ public MySqlBatch add(String sql) {
     @Override
     public Flux<MySqlResult> execute() {
         return QueryFlow.execute(client, getSql())
-            .map(messages -> MySqlResult.toResult(false, codecs, context, null, messages));
+            .map(messages -> MySqlSegmentResult.toResult(false, codecs, context, null, messages));
     }
 
     @Override

r2dbc-mysql/src/main/java/io/asyncer/r2dbc/mysql/MySqlColumnDescriptor.java

@@ -16,6 +16,8 @@
 
 package io.asyncer.r2dbc.mysql;
 
+import io.asyncer.r2dbc.mysql.api.MySqlColumnMetadata;
+import io.asyncer.r2dbc.mysql.api.MySqlNativeTypeMetadata;
 import io.asyncer.r2dbc.mysql.codec.CodecContext;
 import io.asyncer.r2dbc.mysql.collation.CharCollation;
 import io.asyncer.r2dbc.mysql.constant.MySqlType;
@@ -48,28 +50,28 @@ final class MySqlColumnDescriptor implements MySqlColumnMetadata {
 
     private final int collationId;
 
-    private MySqlColumnDescriptor(int index, short typeId, String name, ColumnDefinition definition,
+    private MySqlColumnDescriptor(int index, short typeId, String name, int definitions,
         long size, int decimals, int collationId) {
         require(index >= 0, "index must not be a negative integer");
         require(size >= 0, "size must not be a negative integer");
         require(decimals >= 0, "decimals must not be a negative integer");
         requireNonNull(name, "name must not be null");
-        require(collationId > 0, "collationId must be a positive integer");
-        requireNonNull(definition, "definition must not be null");
+
+        MySqlTypeMetadata typeMetadata = new MySqlTypeMetadata(typeId, definitions, collationId);
 
         this.index = index;
-        this.typeMetadata = new MySqlTypeMetadata(typeId, definition);
-        this.type = MySqlType.of(typeId, definition);
+        this.typeMetadata = typeMetadata;
+        this.type = MySqlType.of(typeMetadata);
         this.name = name;
-        this.nullability = definition.isNotNull() ? Nullability.NON_NULL : Nullability.NULLABLE;
+        this.nullability = typeMetadata.isNotNull() ? Nullability.NON_NULL : Nullability.NULLABLE;
         this.size = size;
         this.decimals = decimals;
         this.collationId = collationId;
     }
 
     static MySqlColumnDescriptor create(int index, DefinitionMetadataMessage message) {
-        ColumnDefinition definition = message.getDefinition();
-        return new MySqlColumnDescriptor(index, message.getTypeId(), message.getColumn(), definition,
+        int definitions = message.getDefinitions();
+        return new MySqlColumnDescriptor(index, message.getTypeId(), message.getColumn(), definitions,
             message.getSize(), message.getDecimals(), message.getCollationId());
     }
 
@@ -88,7 +90,7 @@ public String getName() {
     }
 
     @Override
-    public MySqlTypeMetadata getNativeTypeMetadata() {
+    public MySqlNativeTypeMetadata getNativeTypeMetadata() {
         return typeMetadata;
     }
 
@@ -99,14 +101,13 @@ public Nullability getNullability() {
 
     @Override
     public Integer getPrecision() {
+        // FIXME: NEW_DECIMAL and DECIMAL are "exact" fixed-point number.
+        // So the `size` have to subtract:
+        // 1. if signed, 1 byte for the sign
+        // 2. if decimals > 0, 1 byte for the dot
         return (int) size;
     }
 
-    @Override
-    public long getNativePrecision() {
-        return size;
-    }
-
     @Override
     public Integer getScale() {
         // 0x00 means it is an integer or a static string.