/*******************************************************************************
 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
 * in Industry THTH ry.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.db.tests.regression.bugs;

import org.junit.Test;
import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.Session;
import org.simantics.db.WriteGraph;
import org.simantics.db.common.request.ReadRequest;
import org.simantics.db.common.request.WriteRequest;
import org.simantics.db.exception.AssumptionException;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.exception.ResourceNotFoundException;
import org.simantics.db.testing.base.ExistingDatabaseTest;
import org.simantics.layer0.Layer0;

/**
 * Tests that exception during write causes canceling of changes.
 * This tests must be added at least twice in order for the bug to appear.
 * Even then the bug is not deterministic.
 */
public class WriteCancelTest3 extends ExistingDatabaseTest {
    final String resourceName = "WriteCancelTest3";
    @Test
    public void testWriteCancelTest3() throws Exception {
    	final Session session = getSession();
        boolean exceptionThrown = false;
        try {
            session.syncRequest(new WriteRequest() {
                @Override
                public void perform(WriteGraph graph) throws DatabaseException {
                    Layer0 L0 = Layer0.getInstance(graph);
                    checkThatInstanceDoesNotExist(graph);
                    Resource r1 = graph.newResource();
                    graph.claim(r1, L0.InstanceOf, null, L0.Library);
                    graph.claimLiteral(r1, L0.HasName, resourceName);
                    Resource root = graph.getResource(ROOT_LIBRARY_URI);
                    graph.claim(root, L0.ConsistsOf, L0.PartOf, r1);
                    checkThatInstanceDoesExist(graph);
                    throw new AssumptionException("Intentional exception during write.");
                }
            });
        } catch (AssumptionException e) {
            exceptionThrown = true;
            if (DEBUG)
                System.out.println("Catched AssumptionException as excepected:" + e.getMessage());
        } catch (Throwable e) {
            fail("Write transaction threw an unknown exception " + e);
        }
        assertTrue("Failed to throw exception as expected.", exceptionThrown);
        session.sync(new ReadRequest() {
            @Override
            public void run(ReadGraph graph) throws DatabaseException {
                checkThatInstanceDoesNotExist(graph);
            }
        });
    }
    private void checkThatInstanceDoesExist(final ReadGraph graph) {
        try {
            String uri = ROOT_LIBRARY_URI + "/" + resourceName;
            Resource r = graph.getResource(uri);
            if (null == r)
                fail("Uri " + uri + " has not been defined.");
        } catch (DatabaseException e) {
            fail("Unexpected exception during read request: " + e.getMessage());
        }
    }
    private void checkThatInstanceDoesNotExist(final ReadGraph graph) {
        try {
            String uri = ROOT_LIBRARY_URI + "/" + resourceName;
            Resource r = graph.getResource(uri);
            if (null != r)
                fail("Uri " + uri + " has been defined.");
        } catch (ResourceNotFoundException e) {
            if (DEBUG)
                System.out.println("Catched ResourceNotFoundException as expected.");
        } catch (DatabaseException e) {
            fail("Unexpected exception during read request: " + e.getMessage());
        }
    }
}