Remove dead async callback code

Author: jyemin

driver-core/src/main/com/mongodb/internal/async/client/AsyncClientSession.java

@@ -17,7 +17,6 @@
 package com.mongodb.internal.async.client;
 
 import com.mongodb.TransactionOptions;
-import com.mongodb.internal.async.SingleResultCallback;
 
 /**
  * A client session that supports transactions.
@@ -47,38 +46,4 @@ public interface AsyncClientSession extends com.mongodb.session.ClientSession {
      * @return the transaction options
      */
     TransactionOptions getTransactionOptions();
-
-    /**
-     * Start a transaction in the context of this session with default transaction options. A transaction can not be started if there is
-     * already an active transaction on this session.
-     *
-     * @mongodb.server.release 4.0
-     */
-    void startTransaction();
-
-    /**
-     * Start a transaction in the context of this session with the given transaction options. A transaction can not be started if there is
-     * already an active transaction on this session.
-     *
-     * @param transactionOptions the options to apply to the transaction
-     *
-     * @mongodb.server.release 4.0
-     */
-    void startTransaction(TransactionOptions transactionOptions);
-
-    /**
-     * Commit a transaction in the context of this session.  A transaction can only be commmited if one has first been started.
-     *
-     * @param callback the result callback
-     * @mongodb.server.release 4.0
-     */
-    void commitTransaction(SingleResultCallback<Void> callback);
-
-    /**
-     * Abort a transaction in the context of this session.  A transaction can only be aborted if one has first been started.
-     *
-     * @param callback the result callback
-     * @mongodb.server.release 4.0
-     */
-    void abortTransaction(SingleResultCallback<Void> callback);
 }

driver-reactive-streams/src/main/com/mongodb/reactivestreams/client/internal/ClientSessionPublisherImpl.java

@@ -23,7 +23,6 @@
 import com.mongodb.ReadConcern;
 import com.mongodb.TransactionOptions;
 import com.mongodb.WriteConcern;
-import com.mongodb.internal.async.SingleResultCallback;
 import com.mongodb.internal.async.client.AsyncClientSession;
 import com.mongodb.internal.operation.AbortTransactionOperation;
 import com.mongodb.internal.operation.AsyncReadOperation;
@@ -125,24 +124,6 @@ public void startTransaction(final TransactionOptions transactionOptions) {
         clearTransactionContext();
     }
 
-    @Override
-    public void commitTransaction(final SingleResultCallback<Void> callback) {
-        try {
-            Mono.from(commitTransaction()).subscribe(s -> callback.onResult(s, null), e -> callback.onResult(null, e));
-        } catch (Throwable t) {
-            callback.onResult(null, t);
-        }
-    }
-
-    @Override
-    public void abortTransaction(final SingleResultCallback<Void> callback) {
-        try {
-            Mono.from(abortTransaction()).subscribe(s -> callback.onResult(s, null), e -> callback.onResult(null, e));
-        } catch (Throwable t) {
-            callback.onResult(null, t);
-        }
-    }
-
     @Override
     public AsyncClientSession getWrapped() {
         return this;