Remove usage of context local map

vertx-sql-client/src/main/java/io/vertx/sqlclient/Pool.java

@@ -28,7 +28,7 @@
 import io.vertx.core.Vertx;
 import io.vertx.core.net.NetClientOptions;
 import io.vertx.core.internal.ContextInternal;
-import io.vertx.sqlclient.internal.pool.PoolImpl;
+import io.vertx.sqlclient.impl.TransactionPropagationLocal;
 import io.vertx.sqlclient.impl.Utils;
 import io.vertx.sqlclient.spi.Driver;
 
@@ -158,7 +158,7 @@ static Pool pool(Vertx vertx, SqlConnectOptions database, PoolOptions options) {
   default <T> Future<@Nullable T> withTransaction(TransactionPropagation txPropagation, Function<SqlConnection, Future<@Nullable T>> function) {
     if (txPropagation == TransactionPropagation.CONTEXT) {
       ContextInternal context = (ContextInternal) Vertx.currentContext();
-      SqlConnection sqlConnection = context.getLocal(PoolImpl.PROPAGATABLE_CONNECTION);
+      SqlConnection sqlConnection = context.getLocal(TransactionPropagationLocal.KEY);
       if (sqlConnection == null) {
         return startPropagatableConnection(this, function);
       }

vertx-sql-client/src/main/java/io/vertx/sqlclient/impl/TransactionPropagationLocal.java

@@ -0,0 +1,15 @@
+package io.vertx.sqlclient.impl;
+
+import io.vertx.core.internal.VertxBootstrap;
+import io.vertx.core.spi.VertxServiceProvider;
+import io.vertx.core.spi.context.storage.ContextLocal;
+import io.vertx.sqlclient.SqlConnection;
+
+public class TransactionPropagationLocal implements VertxServiceProvider {
+
+  public static final ContextLocal<SqlConnection> KEY = ContextLocal.registerLocal(SqlConnection.class);
+
+  @Override
+  public void init(VertxBootstrap builder) {
+  }
+}

vertx-sql-client/src/main/java/io/vertx/sqlclient/internal/pool/PoolImpl.java

@@ -26,6 +26,7 @@
 import io.vertx.core.spi.metrics.PoolMetrics;
 import io.vertx.core.spi.metrics.VertxMetrics;
 import io.vertx.sqlclient.*;
+import io.vertx.sqlclient.impl.TransactionPropagationLocal;
 import io.vertx.sqlclient.impl.pool.SqlConnectionPool;
 import io.vertx.sqlclient.internal.Connection;
 import io.vertx.sqlclient.internal.SqlClientBase;
@@ -54,8 +55,6 @@ public class PoolImpl extends SqlClientBase implements Pool, Closeable {
   private final Handler<SqlConnection> connectionInitializer;
   private long timerID;
 
-  public static final String PROPAGATABLE_CONNECTION = "propagatable_connection";
-
   public PoolImpl(VertxInternal vertx,
                   Driver driver,
                   boolean pipelined,
@@ -149,7 +148,7 @@ public Future<SqlConnection> getConnection() {
 
   public static <T> Future<@Nullable T> startPropagatableConnection(Pool pool, Function<SqlConnection, Future<@Nullable T>> function) {
     ContextInternal context = (ContextInternal) Vertx.currentContext();
-    return pool.getConnection().onComplete(handler -> context.putLocal(PROPAGATABLE_CONNECTION, handler.result()))
+    return pool.getConnection().onComplete(handler -> context.putLocal(TransactionPropagationLocal.KEY, handler.result()))
       .flatMap(conn -> conn
         .begin()
         .flatMap(tx -> function
@@ -167,7 +166,7 @@ public Future<SqlConnection> getConnection() {
                   .compose(v -> context.failedFuture(err), failure -> context.failedFuture(err));
               }
             }))
-        .onComplete(ar -> conn.close().onComplete(v -> context.removeLocal(PROPAGATABLE_CONNECTION))));
+        .onComplete(ar -> conn.close().onComplete(v -> context.removeLocal(TransactionPropagationLocal.KEY))));
   }
 
   @Override

vertx-sql-client/src/main/java/module-info.java

@@ -1,3 +1,6 @@
+import io.vertx.core.spi.VertxServiceProvider;
+import io.vertx.sqlclient.impl.TransactionPropagationLocal;
+
 module io.vertx.sql.client {
 
   requires io.netty.common;
@@ -18,6 +21,8 @@
 
   uses io.vertx.sqlclient.spi.Driver;
 
+  provides io.vertx.core.spi.VertxServiceProvider with io.vertx.sqlclient.impl.TransactionPropagationLocal;
+
   // Expose enough for implementing a client back-end on top of this API (e.g. vertx-jdbc-client)
 
   exports io.vertx.sqlclient.internal;

vertx-sql-client/src/main/resources/META-INF/services/io.vertx.core.spi.VertxServiceProvider

@@ -0,0 +1 @@
+io.vertx.sqlclient.impl.TransactionPropagationLocal