content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License. You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.activemq.artemis.tests.soak.client;
  
  import javax.transaction.xa.XAResource;
  import javax.transaction.xa.Xid;
  
  import org.apache.activemq.artemis.api.core.client.ClientSession;
  import org.apache.activemq.artemis.api.core.client.ClientSessionFactory;
  import org.apache.activemq.artemis.core.transaction.impl.XidImpl;
  import org.apache.activemq.artemis.utils.UUIDGenerator;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import java.lang.invoke.MethodHandles;
  
  /**
   * <b>WARNING</b>: This is not a sample on how you should handle XA. You are supposed to use a TransactionManager. This
   * class is doing the job of a TransactionManager that fits for the purpose of this test only, however there are many
   * more pitfalls to deal with Transactions.
   * <p>
   * This is just to stress and soak test Transactions with ActiveMQ Artemis.
   * <p>
   * And this is dealing with XA directly for the purpose testing only.
   */
  public abstract class ClientAbstract extends Thread {
  
     private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  
     protected ClientSession session;
  
     protected final ClientSessionFactory sf;
  
     protected Xid activeXid;
  
     protected volatile boolean running = true;
  
     protected int errors = 0;
  
     /**
      * A commit was called case we don't find the Xid, means it was accepted
      */
     protected volatile boolean pendingCommit = false;
  
     public ClientAbstract(ClientSessionFactory sf) {
        this.sf = sf;
     }
  
     public ClientSession getConnection() {
        return session;
     }
  
     public int getErrorsCount() {
        return errors;
     }
  
     public final void connect() {
        while (running) {
           try {
              disconnect();
  
              session = sf.createXASession();
  
              if (activeXid != null) {
                 synchronized (ClientAbstract.class) {
                    Xid[] xids = session.recover(XAResource.TMSTARTRSCAN);
                    boolean found = false;
                    for (Xid recXid : xids) {
                       if (recXid.equals(activeXid)) {
                          // System.out.println("Calling commit after a prepare on " + this);
                          found = true;
                          callCommit();
                       }
                    }
  
                    if (!found) {
                       if (pendingCommit) {
                          onCommit();
                       } else {
                          onRollback();
                       }
  
                       activeXid = null;
                       pendingCommit = false;
                    }
                 }
              }
  
              connectClients();
  
              break;
           } catch (Exception e) {
              ClientAbstract.logger.warn("Can't connect to server, retrying");
              disconnect();
              try {
                 Thread.sleep(1000);
              } catch (InterruptedException ignored) {
                 // if an interruption was sent, we will respect it and leave the loop
                 break;
              }
           }
        }
     }
  
     @Override
     public void run() {
        connect();
     }
  
     protected void callCommit() throws Exception {
        pendingCommit = true;
        session.commit(activeXid, false);
        pendingCommit = false;
        activeXid = null;
        onCommit();
     }
  
     protected void callPrepare() throws Exception {
        session.prepare(activeXid);
     }
  
     public void beginTX() throws Exception {
        activeXid = newXID();
  
        session.start(activeXid, XAResource.TMNOFLAGS);
     }
  
     public void endTX() throws Exception {
        session.end(activeXid, XAResource.TMSUCCESS);
        callPrepare();
        callCommit();
     }
  
     public void setRunning(final boolean running) {
        this.running = running;
     }
  
     private XidImpl newXID() {
        return new XidImpl("tst".getBytes(), 1, UUIDGenerator.getInstance().generateStringUUID().getBytes());
     }
  
     protected abstract void connectClients() throws Exception;
  
     protected abstract void onCommit();
  
     protected abstract void onRollback();
  
     public void disconnect() {
        try {
           if (session != null) {
              session.close();
           }
        } catch (Exception ignored) {
           ignored.printStackTrace();
        }
  
        session = null;
     }
  
  }
  