org.jooby.internal.hbm.TrxResponse.java Source code

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Here is the source code for org.jooby.internal.hbm.TrxResponse.java

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/**
 * 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.jooby.internal.hbm;

import java.sql.Connection;
import java.util.function.Consumer;

import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;

import org.hibernate.FlushMode;
import org.hibernate.Session;
import org.hibernate.engine.spi.SessionImplementor;
import org.jooby.Response;
import org.jooby.Result;
import org.jooby.hbm.OpenSessionInView;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class TrxResponse extends Response.Forwarding {

    /** The logging system. */
    private final Logger log = LoggerFactory.getLogger(OpenSessionInView.class);

    private Session session;

    private EntityManager em;

    private String sessionId;

    private EntityTransaction trx;

    private boolean rollbackOnly;

    public TrxResponse(final Response response, final EntityManager em) {
        super(response);
        this.em = em;
        this.session = (Session) em.getDelegate();
        this.sessionId = Integer.toHexString(System.identityHashCode(session));
    }

    public TrxResponse begin() {
        this.trx = em.getTransaction();

        log.debug("  [{}] starting transation: {}", sessionId, trx);

        trx.begin();

        return this;
    }

    public void setRollbackOnly() {
        rollbackOnly = true;
    }

    private void trxSend(final Object result) throws Throwable {

        Consumer<Boolean> setReadOnly = (readOnly) -> {
            try {
                Connection connection = ((SessionImplementor) session).connection();
                connection.setReadOnly(readOnly);
            } catch (Exception ex) {
                log.trace("  [" + sessionId + "] unable to setReadOnly " + readOnly, ex);
            }
            session.setDefaultReadOnly(readOnly);
        };

        try {
            log.debug("  [{}] flushing", sessionId);
            session.flush();

            if (trx.isActive()) {
                log.debug("  [{}] commiting transaction: {}", sessionId, trx);
                trx.commit();
            }

            EntityTransaction readOnlyTrx = null;
            try {
                // start new transaction
                log.debug("  [{}] setting connection to read only", sessionId);
                setReadOnly.accept(true);
                session.setFlushMode(FlushMode.MANUAL);
                readOnlyTrx = em.getTransaction();
                log.debug("  [{}] starting readonly transaction: {}", sessionId, readOnlyTrx);
                readOnlyTrx.begin();

                // send it!
                rsp.send(result);

                log.debug("  [{}] commiting readonly transaction: {}", sessionId, readOnlyTrx);
                readOnlyTrx.commit();
            } catch (Throwable ex) {
                if (readOnlyTrx != null && readOnlyTrx.isActive()) {
                    log.debug("  [{}] rolling back readonly transaction: {}", sessionId, readOnlyTrx);
                    readOnlyTrx.rollback();
                }
                throw ex;
            } finally {
                log.debug("  [{}] removing readonly mode from connection", sessionId);
                setReadOnly.accept(false);
            }
        } catch (Throwable ex) {
            rollbackOnly = true;
            throw ex;
        } finally {
            done();
        }
    }

    public void done() {
        EntityManager em = this.em;
        if (em == null) {
            return;
        }
        EntityTransaction trx = this.trx;
        this.em = null;
        this.session = null;
        this.trx = null;
        try {
            if (trx.isActive()) {
                if (rollbackOnly) {
                    log.debug("  [{}] rolling back transation: {}", sessionId, trx);
                    trx.rollback();
                } else {
                    log.debug("  [{}] commiting transaction: {}", sessionId, trx);
                    trx.commit();
                }
            }
        } catch (Exception ex) {
            log.error("  [" + sessionId + "] unable trying to commit/rollback trx resulted in error", ex);
        } finally {
            log.debug("  [{}] closing", sessionId);
            em.close();
        }
    }

    @Override
    public void send(final Object result) throws Throwable {
        trxSend(result);
    }

    @Override
    public void send(final Result result) throws Throwable {
        trxSend(result);
    }

}