Java Transaction类代码示例

import org.neo4j.driver.v1.Transaction; //导入依赖的package包/类
public boolean importExport(String branchId) {
    final DbServices dbServices = DbServicesManager.getDbServices(branchId);
    final Collection<String> importExportQueries = ResourceReader.getImportExportQueries();

    try (Transaction tx = dbServices.beginTx()) {
        for (String query : importExportQueries) {
            dbServices.execute(query);
        }

        tx.success();
        return true;
    } catch (Exception e) {
        e.printStackTrace();
        return false;
    }
}
 

import org.neo4j.driver.v1.Transaction; //导入依赖的package包/类
public String run(String branchId) {
    final DbServices dbServices = DbServicesManager.getDbServices(branchId);
    try (Transaction tx = dbServices.beginTx()) {
        final StatementResult result = dbServices.execute(GET_LAST_COMMIT_HASH);

        JSONObject response = new JSONObject();
        while (result.hasNext()) {
            Record next = result.next();

            Object commitHash = next.get("commitHash");
            response.put("commitHash", commitHash);
        }

        return response.toString();
    } catch (Exception e) {
        e.printStackTrace();
    }

    return "ERROR";
}
 

import org.neo4j.driver.v1.Transaction; //导入依赖的package包/类
protected void parseFile(String sessionId, String path, String content, String branchId, Transaction tx) throws JsError {
    Stopwatch stopwatch = Stopwatch.createUnstarted();

    ParserWithLocation parser = new ParserWithLocation();
    stopwatch.start();
    Module module = parser.parseModule(content);
    long parseDone = stopwatch.elapsed(TimeUnit.MILLISECONDS);
    logger.info(
        String.format("%s %s %dms", path, "PARSE", parseDone)
    );
    stopwatch.reset();

    stopwatch.start();
    GlobalScope scope = ScopeAnalyzer.analyze(module);
    long scopeDone = stopwatch.elapsed(TimeUnit.MILLISECONDS);
    logger.info(
        String.format("%s %s %dms", path, "SCOPE", scopeDone)
    );
    stopwatch.reset();

    ASTScopeProcessor astScopeProcessor = new ASTScopeProcessor(path, parser);
    astScopeProcessor.processScope(scope, sessionId, tx);
}
 

import org.neo4j.driver.v1.Transaction; //导入依赖的package包/类
public String transactionEnlistmentReadAfterCallingTransactionClose() {
    // JTA transaction is started by CMT, the following obtains a Session that is enlisted into the JTA transaction.
    Session session = injectedDriver.session();
    // The only way to influence success/failure of the Neo4j + JTA transaction, is at the JTA transaction level.
    // If the JTA transaction fails, org.neo4j.driver.v1.Transaction.failure() is called.
    // If the JTA transaction succeeds, org.neo4j.driver.v1.Transaction.success() is called.
    // org.neo4j.driver.v1.Transaction.close() is also called when the JTA transaction ends.

    // Calls to Session.beginTransaction() in a JTA transaction are expected to throw a RuntimeException
    try {
        Transaction transaction = session.beginTransaction();
        fail("Calling Session.beginTransaction in a JTA transaction should throw a RuntimeException.");
    } catch (RuntimeException expectedException) {
        // success
    }

    try {
        session.run("CREATE (a:Person {name:'TRANSACTION', title:'King'})");
        return nestedBean.getPerson("TRANSACTION");
    } finally {
        if ( session.isOpen()) { // this will be true
            session.run("MATCH (a:Person) delete a");
            session.close();             // ignored, session is auto closed when the transaction ends.
        }
    }
}
 

import org.neo4j.driver.v1.Transaction; //导入依赖的package包/类
@BeforeClass
public void prepareTest() throws IOException {

  Config reference  = ConfigFactory.load();
  File conf = new File("target/test-classes/TwitterFollowNeo4jIT.conf");
  assertTrue(conf.exists());
  Config testResourceConfig  = ConfigFactory.parseFileAnySyntax(conf, ConfigParseOptions.defaults().setAllowMissing(false));
  Config typesafe  = testResourceConfig.withFallback(reference).resolve();
  testConfiguration = new ComponentConfigurator<>(TwitterFollowNeo4jConfiguration.class).detectConfiguration(typesafe);
  testClient = Neo4jBoltClient.getInstance(testConfiguration.getNeo4j());

  Session session = testClient.client().session();
  Transaction transaction = session.beginTransaction();
  transaction.run("MATCH ()-[r]-() DELETE r");
  transaction.run("MATCH (n) DETACH DELETE n");
  transaction.success();
  session.close();
}
 

import org.neo4j.driver.v1.Transaction; //导入依赖的package包/类
@Override
public void executeOperation(LdbcUpdate2AddPostLike operation,
    DbConnectionState dbConnectionState,
    ResultReporter reporter) throws DbException {

  Driver driver = ((Neo4jDbConnectionState) dbConnectionState).getDriver();

  try (Session session = driver.session(AccessMode.WRITE)) {
    try (Transaction tx = session.beginTransaction()) {
      String statement =
          "   MATCH (p:Person {id:{personId}}),"
          + "       (m:Post {id:{postId}})"
          + " CREATE (p)-[:LIKES {creationDate:{creationDate}}]->(m)";
      Value parameters = parameters(
          "personId", String.valueOf(operation.personId()),
          "postId", String.valueOf(operation.postId()),
          "creationDate", operation.creationDate().getTime());

      tx.run(statement, parameters);
      tx.success();
      tx.close();
    }
  }

  reporter.report(0, LdbcNoResult.INSTANCE, operation);
}
 

import org.neo4j.driver.v1.Transaction; //导入依赖的package包/类
private void executeInTransaction(
        Consumer<Transaction> consumer,
        String consumerDescription,
        Meter failureMeter
) {
    try (
            Session session = sessionFactory.getSession();
            Transaction transaction = session.beginTransaction()
    ) {
        try {
            consumer.accept(transaction);
            transaction.success();
        } catch (Exception e) {
            transaction.failure();
            failureMeter.mark();

            Throwables.propagateIfInstanceOf(e, Neo4jPersistenceException.class);
            throw Neo4jPersistenceException.create("Failed to " + consumerDescription, e);
        }
    }
}
 

import org.neo4j.driver.v1.Transaction; //导入依赖的package包/类
public List<Map<String, Object>> commit(Function<Transaction, List<Map<String, Object>>> callback) {
    try (Driver driver = GraphDatabase.driver(configuration.getBoltUri(), configuration.getAuthToken());
         Session session = driver.session();
         Transaction tx = session.beginTransaction()) {

        List<Map<String, Object>> result = callback.apply(tx);
        tx.success();
        return result;
    }
}
 

import org.neo4j.driver.v1.Transaction; //导入依赖的package包/类
public void rollback(Consumer<Transaction> callback) {
    try (Driver driver = GraphDatabase.driver(configuration.getBoltUri(), configuration.getAuthToken());
         Session session = driver.session();
         Transaction tx = session.beginTransaction()) {

        callback.accept(tx);
        tx.failure();
    }
}
 

import org.neo4j.driver.v1.Transaction; //导入依赖的package包/类
public int countAll(String branchId) {
    final DbServices dbServices = DbServicesManager.getDbServices(branchId);

    try (Transaction tx = dbServices.beginTx()) {
        StatementResult result = dbServices.execute(COUNT_NODES);
        tx.success();

        return result.single().get("count").asInt();
    }
}
 

import org.neo4j.driver.v1.Transaction; //导入依赖的package包/类
public int countCompilationUnitNodes(String branchId) {
    final DbServices dbServices = DbServicesManager.getDbServices(branchId);

    try (Transaction tx = dbServices.beginTx()) {
        StatementResult result = dbServices.execute(COUNT_COMPILATIONUNIT_NODES);
        tx.success();

        return result.single().get("count").asInt();
    }
}
 

import org.neo4j.driver.v1.Transaction; //导入依赖的package包/类
public void runAnalyses(String branchId) {
    final DbServices dbServices = DbServicesManager.getDbServices(branchId);
    final Collection<String> analysisQueries = ResourceReader.getAnalysisQueries();

    for (String query : analysisQueries) {
        try (Transaction tx = dbServices.beginTx()) {
            StatementResult result = dbServices.execute(query);
            while (result.hasNext()) {
                Record record = result.next();

                String message = record.get("message").asString();
                String entityName = record.get("entityName").asString();
                String compilationUnitPath = record.get("compilationUnitPath").asString();
                int line = Integer.parseInt(record.get("line").asString());
                int column = Integer.parseInt(record.get("column").asString());

                if (entityName.isEmpty()) {
                    logger.info(String.format("%s at %d:%d in %s", message, line, column, compilationUnitPath));
                } else {
                    logger.info(String.format("%s: %s at %d:%d in %s", message, entityName, line, column, compilationUnitPath));
                }
            }

            tx.success();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
 

import org.neo4j.driver.v1.Transaction; //导入依赖的package包/类
public boolean delete(String branchId) {
    final DbServices dbServices = DbServicesManager.getDbServices(branchId);

    try (Transaction tx = dbServices.beginTx()) {
        dbServices.execute(DELETE_GRAPH);
        tx.success();

        return true;
    }
}
 

import org.neo4j.driver.v1.Transaction; //导入依赖的package包/类
public boolean add(String sessionId, String path, String content, String branchId, String commitHash, Transaction tx) {
    setCommitHashInNewTransaction(branchId, commitHash);

    try {
        parseFile(sessionId, path, content, branchId, tx);

        return true;
    } catch (JsError jsError) {
        System.err.println(path);
        jsError.printStackTrace();

        return false;
    }
}
 

import org.neo4j.driver.v1.Transaction; //导入依赖的package包/类
private void setCommitHash(DbServices dbServices, Transaction tx, String branchId, String commitHash) {
    if (commitHash == null) {
        return;
    }

    Map<String, Object> parameters = new HashMap<>();
    parameters.put("commithash", commitHash);

    dbServices.execute(SET_COMMIT_HASH, parameters);
}