/*
 * Copyright 2010-2013 Luca Garulli (l.garulli--at--orientechnologies.com)
 *
 * Licensed 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 com.orientechnologies.orient.server.distributed;

import org.junit.Assert;
import org.junit.Test;

import com.orientechnologies.common.util.OCallable;
import com.orientechnologies.orient.core.db.document.ODatabaseDocumentTx;

/**
 * Distributed non TX test against "remote" protocol. It starts 3 servers and during a stress test, kill last server. The test
 * checks all the clients can auto-reconnect to the next available server.
 */
public class HACrashTest extends AbstractServerClusterTxTest {
  final static int         SERVERS         = 3;
  volatile private boolean inserting       = true;
  volatile private int     serverStarted   = 0;
  volatile private boolean serverRestarted = false;

  @Test
  public void test() throws Exception {
    startupNodesInSequence = true;
    count = 500;
    maxRetries = 10;
    delayWriter = 0;
    useTransactions = false;
    init(SERVERS);
    prepare(false);
    execute();
  }

  @Override
  protected void onServerStarted(ServerRun server) {
    super.onServerStarted(server);

    if (serverStarted++ == (SERVERS - 1)) {
      // RUN ASYNCHRONOUSLY
      new Thread(new Runnable() {
        @Override
        public void run() {
          try {
            // CRASH LAST SERVER try {
            executeWhen(0, new OCallable<Boolean, ODatabaseDocumentTx>() {
              // CONDITION
              @Override
              public Boolean call(ODatabaseDocumentTx db) {
                return db.countClass("Person") > (count * SERVERS * writerCount + baseCount) * 1 / 3;
              }
            }, // ACTION
                new OCallable<Boolean, ODatabaseDocumentTx>() {
                  @Override
                  public Boolean call(ODatabaseDocumentTx db) {
                    Assert.assertTrue("Insert was too fast", inserting);
                    banner("SIMULATE FAILURE ON SERVER " + (SERVERS - 1));

                    delayWriter = 50;
                    serverInstance.get(SERVERS - 1).crashServer();

                    executeWhen(db, new OCallable<Boolean, ODatabaseDocumentTx>() {
                      @Override
                      public Boolean call(ODatabaseDocumentTx db) {
                        return db.countClass("Person") > (count * writerCount * SERVERS) * 2 / 4;
                      }
                    }, new OCallable<Boolean, ODatabaseDocumentTx>() {
                      @Override
                      public Boolean call(ODatabaseDocumentTx db) {
                        Assert.assertTrue("Insert was too fast", inserting);

                        banner("RESTARTING SERVER " + (SERVERS - 1) + "...");
                        try {
                          serverInstance.get(SERVERS - 1)
                              .startServer(getDistributedServerConfiguration(serverInstance.get(SERVERS - 1)));
                          serverRestarted = true;
                          delayWriter = 0;

                        } catch (Exception e) {
                          e.printStackTrace();
                        }
                        return null;
                      }
                    });
                    return null;
                  }
                });

          } catch (Exception e) {
            e.printStackTrace();
            Assert.fail("Error on execution flow");
          }
        }
      }).start();
    }
  }

  @Override
  protected void onBeforeChecks() throws InterruptedException {
    // // WAIT UNTIL THE END
    waitFor(2, new OCallable<Boolean, ODatabaseDocumentTx>() {
      @Override
      public Boolean call(ODatabaseDocumentTx db) {
        final boolean ok = db.countClass("Person") >= count * writerCount * SERVERS + baseCount;
        if (!ok)
          System.out.println(
              "FOUND " + db.countClass("Person") + " people instead of expected " + (count * writerCount * SERVERS) + baseCount);
        return ok;
      }
    }, 10000);
  }

  @Override
  protected void onAfterExecution() throws Exception {
    inserting = false;

    waitFor(20000, new OCallable<Boolean, Void>() {
      @Override
      public Boolean call(Void iArgument) {
        return serverRestarted;
      }
    }, "Server 2 is not active yet");

    banner("CHECKING IF NODE 2 IS STILL ACTIVE");
    Assert.assertTrue(serverRestarted);
  }

  protected String getDatabaseURL(final ServerRun server) {
    final String address = server.getBinaryProtocolAddress();

    if( address == null )
      return null;

    return "remote:" + address + "/" + getDatabaseName();
  }

  @Override
  public String getDatabaseName() {
    return "distributed-txhacrash";
  }
}