001/*
002 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Florent Guillaume
018 */
019
020package org.nuxeo.ecm.core.storage.sql.jdbc;
021
022import java.io.Serializable;
023import java.sql.Types;
024
025import org.apache.commons.logging.Log;
026import org.apache.commons.logging.LogFactory;
027import org.nuxeo.ecm.core.api.NuxeoException;
028import org.nuxeo.ecm.core.storage.sql.ClusterInvalidator;
029import org.nuxeo.ecm.core.storage.sql.Invalidations;
030import org.nuxeo.ecm.core.storage.sql.Mapper;
031import org.nuxeo.ecm.core.storage.sql.RepositoryDescriptor;
032import org.nuxeo.ecm.core.storage.sql.RepositoryImpl;
033
034/**
035 * Implementation of {@link ClusterInvalidator} that uses the JDBC Mapper to read/write invalidations.
036 */
037public class JDBCClusterInvalidator implements ClusterInvalidator {
038
039    private static final Log log = LogFactory.getLog(JDBCClusterInvalidator.class);
040
041    /** Cluster node id. */
042    private Serializable nodeId;
043
044    /** Cluster node mapper. Used synchronized. */
045    private Mapper mapper;
046
047    private long clusteringDelay;
048
049    // modified only under clusterMapper synchronization
050    private long clusterNodeLastInvalidationTimeMillis;
051
052    @Override
053    public void initialize(String nodeId, RepositoryImpl repository) {
054        RepositoryDescriptor repositoryDescriptor = repository.getRepositoryDescriptor();
055        clusteringDelay = repositoryDescriptor.getClusteringDelay();
056        processClusterInvalidationsNext();
057        // create mapper
058        mapper = repository.newMapper(null, false);
059        Serializable nodeIdSer;
060        if (mapper.getClusterNodeIdType() == Types.VARCHAR) { // sql type
061            nodeIdSer = nodeId;
062        } else {
063            try {
064                nodeIdSer = Long.valueOf(nodeId);
065            } catch (NumberFormatException e) {
066                throw new NuxeoException("Cluster node id must be an integer", e);
067            }
068        }
069        this.nodeId = nodeIdSer;
070        mapper.createClusterNode(nodeIdSer);
071        log.info("Clustering enabled for repository: " + repository.getName() + " with " + clusteringDelay
072                + " ms delay " + " and cluster node id: " + nodeId);
073    }
074
075    @Override
076    public void close() {
077        synchronized (mapper) {
078            mapper.removeClusterNode(nodeId);
079            mapper.close();
080        }
081    }
082
083    // TODO should be called by RepositoryManagement
084    protected void processClusterInvalidationsNext() {
085        clusterNodeLastInvalidationTimeMillis = System.currentTimeMillis() - clusteringDelay - 1;
086    }
087
088    @Override
089    public Invalidations receiveInvalidations() {
090        synchronized (mapper) {
091            long remaining = clusterNodeLastInvalidationTimeMillis + clusteringDelay - System.currentTimeMillis();
092            if (remaining > 0) {
093                // delay hasn't expired
094                log.trace("Not fetching invalidations, remaining time: " + remaining + "ms");
095                return null;
096            }
097            Invalidations invalidations = mapper.getClusterInvalidations(nodeId);
098            clusterNodeLastInvalidationTimeMillis = System.currentTimeMillis();
099            return invalidations;
100        }
101    }
102
103    @Override
104    public void sendInvalidations(Invalidations invalidations) {
105        if (invalidations == null || invalidations.isEmpty()) {
106            return;
107        }
108        synchronized (mapper) {
109            mapper.insertClusterInvalidations(nodeId, invalidations);
110        }
111    }
112
113}