repositoryimpl.java

来自「jsr170接口的java实现。是个apache的开源项目。」· Java 代码 · 共 1,761 行 · 第 1/5 页

/*
 * 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.apache.jackrabbit.core;

import EDU.oswego.cs.dl.util.concurrent.Mutex;
import EDU.oswego.cs.dl.util.concurrent.ReadWriteLock;
import EDU.oswego.cs.dl.util.concurrent.ReentrantWriterPreferenceReadWriteLock;
import EDU.oswego.cs.dl.util.concurrent.WriterPreferenceReadWriteLock;
import org.apache.commons.collections.map.ReferenceMap;
import org.apache.jackrabbit.api.JackrabbitRepository;
import org.apache.jackrabbit.core.cluster.ClusterContext;
import org.apache.jackrabbit.core.cluster.ClusterException;
import org.apache.jackrabbit.core.cluster.ClusterNode;
import org.apache.jackrabbit.core.cluster.LockEventChannel;
import org.apache.jackrabbit.core.cluster.UpdateEventChannel;
import org.apache.jackrabbit.core.cluster.UpdateEventListener;
import org.apache.jackrabbit.core.config.ClusterConfig;
import org.apache.jackrabbit.core.config.FileSystemConfig;
import org.apache.jackrabbit.core.config.LoginModuleConfig;
import org.apache.jackrabbit.core.config.PersistenceManagerConfig;
import org.apache.jackrabbit.core.config.RepositoryConfig;
import org.apache.jackrabbit.core.config.VersioningConfig;
import org.apache.jackrabbit.core.config.WorkspaceConfig;
import org.apache.jackrabbit.core.fs.BasedFileSystem;
import org.apache.jackrabbit.core.fs.FileSystem;
import org.apache.jackrabbit.core.fs.FileSystemException;
import org.apache.jackrabbit.core.fs.FileSystemResource;
import org.apache.jackrabbit.core.lock.LockManager;
import org.apache.jackrabbit.core.lock.LockManagerImpl;
import org.apache.jackrabbit.core.nodetype.NodeTypeRegistry;
import org.apache.jackrabbit.core.nodetype.virtual.VirtualNodeTypeStateManager;
import org.apache.jackrabbit.core.observation.DelegatingObservationDispatcher;
import org.apache.jackrabbit.core.observation.EventStateCollection;
import org.apache.jackrabbit.core.observation.ObservationDispatcher;
import org.apache.jackrabbit.core.persistence.PMContext;
import org.apache.jackrabbit.core.persistence.PersistenceManager;
import org.apache.jackrabbit.core.security.AuthContext;
import org.apache.jackrabbit.core.state.CacheManager;
import org.apache.jackrabbit.core.state.ChangeLog;
import org.apache.jackrabbit.core.state.ItemStateCacheFactory;
import org.apache.jackrabbit.core.state.ItemStateException;
import org.apache.jackrabbit.core.state.ManagedMLRUItemStateCacheFactory;
import org.apache.jackrabbit.core.state.SharedItemStateManager;
import org.apache.jackrabbit.core.util.RepositoryLock;
import org.apache.jackrabbit.core.version.VersionManager;
import org.apache.jackrabbit.core.version.VersionManagerImpl;
import org.apache.jackrabbit.name.NamespaceResolver;
import org.apache.jackrabbit.name.QName;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.InputSource;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.security.AccessControlContext;
import java.security.AccessController;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import java.util.Set;

import javax.jcr.AccessDeniedException;
import javax.jcr.Credentials;
import javax.jcr.LoginException;
import javax.jcr.NamespaceRegistry;
import javax.jcr.NoSuchWorkspaceException;
import javax.jcr.RepositoryException;
import javax.jcr.Session;
import javax.jcr.observation.Event;
import javax.jcr.observation.EventIterator;
import javax.jcr.observation.EventListener;
import javax.jcr.observation.ObservationManager;
import javax.security.auth.Subject;

/**
 * A <code>RepositoryImpl</code> ...
 */
public class RepositoryImpl implements JackrabbitRepository, SessionListener,
        EventListener {

    private static Logger log = LoggerFactory.getLogger(RepositoryImpl.class);

    /**
     * hardcoded id of the repository root node
     */
    public static final NodeId ROOT_NODE_ID = NodeId.valueOf("cafebabe-cafe-babe-cafe-babecafebabe");

    /**
     * hardcoded id of the "/jcr:system" node
     */
    public static final NodeId SYSTEM_ROOT_NODE_ID = NodeId.valueOf("deadbeef-cafe-babe-cafe-babecafebabe");

    /**
     * hardcoded id of the "/jcr:system/jcr:versionStorage" node
     */
    public static final NodeId VERSION_STORAGE_NODE_ID = NodeId.valueOf("deadbeef-face-babe-cafe-babecafebabe");

    /**
     * hardcoded id of the "/jcr:system/jcr:nodeTypes" node
     */
    public static final NodeId NODETYPES_NODE_ID = NodeId.valueOf("deadbeef-cafe-cafe-cafe-babecafebabe");

    /**
     * the name of the file system resource containing the properties of the
     * repository.
     */
    private static final String PROPERTIES_RESOURCE = "rep.properties";

    /**
     * the repository properties.
     */
    private final Properties repProps;

    // names of well-known repository properties
    public static final String STATS_NODE_COUNT_PROPERTY = "jcr.repository.stats.nodes.count";
    public static final String STATS_PROP_COUNT_PROPERTY = "jcr.repository.stats.properties.count";

    private NodeId rootNodeId;

    private final NamespaceRegistryImpl nsReg;
    private final NodeTypeRegistry ntReg;
    private final VersionManagerImpl vMgr;
    private final VirtualNodeTypeStateManager virtNTMgr;

    /**
     * Search manager for the jcr:system tree. May be <code>null</code> if
     * none is configured.
     */
    private SearchManager systemSearchMgr;

    // configuration of the repository
    protected final RepositoryConfig repConfig;

    // the virtual repository file system
    private final FileSystem repStore;

    // sub file system where the repository stores meta data such as uuid of root node, etc.
    private final FileSystem metaDataStore;

    /**
     * the delegating observation dispatcher for all workspaces
     */
    private final DelegatingObservationDispatcher delegatingDispatcher =
            new DelegatingObservationDispatcher();

    /**
     * map of workspace names and <code>WorkspaceInfo<code>s.
     */
    private final HashMap wspInfos = new HashMap();

    /**
     * active sessions (weak references)
     */
    private final ReferenceMap activeSessions =
            new ReferenceMap(ReferenceMap.WEAK, ReferenceMap.WEAK);

    // misc. statistics
    private long nodesCount = 0;
    private long propsCount = 0;

    // flag indicating if respository has been shut down
    private boolean disposed = false;

    /**
     * the lock that guards instantiation of multiple repositories.
     */
    private RepositoryLock repLock;

    /**
     * Clustered node used, <code>null</code> if clustering is not configured.
     */
    private ClusterNode clusterNode;

    /**
     * Shutdown lock for guaranteeing that no new sessions are started during
     * repository shutdown and that a repository shutdown is not initiated
     * during a login. Each session login acquires a read lock while the
     * repository shutdown requires a write lock. This guarantees that there
     * can be multiple concurrent logins when the repository is not shutting
     * down, but that only a single shutdown and no concurrent logins can
     * happen simultaneously.
     */
    private final ReadWriteLock shutdownLock = new WriterPreferenceReadWriteLock();

    /**
     * There is one cache manager per repository that manages the sizes of the caches used.
     */
    private final CacheManager cacheMgr = new CacheManager();

    /**
     * There is only one item state cache factory
     */
    private final ItemStateCacheFactory cacheFactory = new ManagedMLRUItemStateCacheFactory(cacheMgr);

    /**
     * private constructor
     *
     * @param repConfig
     */
    protected RepositoryImpl(RepositoryConfig repConfig) throws RepositoryException {

        log.info("Starting repository...");

        this.repConfig = repConfig;

        // Acquire a lock on the repository home
        repLock = new RepositoryLock(repConfig.getHomeDir());
        repLock.acquire();

        // setup file systems
        repStore = repConfig.getFileSystemConfig().createFileSystem();
        String fsRootPath = "/meta";
        try {
            if (!repStore.exists(fsRootPath) || !repStore.isFolder(fsRootPath)) {
                repStore.createFolder(fsRootPath);
            }
        } catch (FileSystemException fse) {
            String msg = "failed to create folder for repository meta data";
            log.error(msg, fse);
            throw new RepositoryException(msg, fse);
        }
        metaDataStore = new BasedFileSystem(repStore, fsRootPath);

        // init root node uuid
        rootNodeId = loadRootNodeId(metaDataStore);

        // load repository properties
        repProps = loadRepProps();
        nodesCount = Long.parseLong(repProps.getProperty(STATS_NODE_COUNT_PROPERTY, "0"));
        propsCount = Long.parseLong(repProps.getProperty(STATS_PROP_COUNT_PROPERTY, "0"));

        // create registries
        nsReg = createNamespaceRegistry(new BasedFileSystem(repStore, "/namespaces"));
        ntReg = createNodeTypeRegistry(nsReg, new BasedFileSystem(repStore, "/nodetypes"));

        // init workspace configs
        Iterator iter = repConfig.getWorkspaceConfigs().iterator();
        while (iter.hasNext()) {
            WorkspaceConfig config = (WorkspaceConfig) iter.next();
            WorkspaceInfo info = createWorkspaceInfo(config);
            wspInfos.put(config.getName(), info);
        }

        // initialize optional clustering
        // put here before setting up any other external event source that a cluster node
        // will be interested in
        if (repConfig.getClusterConfig() != null) {
            clusterNode = createClusterNode();
            nsReg.setEventChannel(clusterNode);
            ntReg.setEventChannel(clusterNode);
        }

        // init version manager
        vMgr = createVersionManager(repConfig.getVersioningConfig(),
                delegatingDispatcher);
        if (clusterNode != null) {
            vMgr.setEventChannel(clusterNode.createUpdateChannel(null));
        }

        // init virtual node type manager
        virtNTMgr = new VirtualNodeTypeStateManager(getNodeTypeRegistry(),
                delegatingDispatcher, NODETYPES_NODE_ID, SYSTEM_ROOT_NODE_ID);

        // initialize startup workspaces
        initStartupWorkspaces();

        // initialize system search manager
        getSystemSearchManager(repConfig.getDefaultWorkspaceName());

        // after the workspace is initialized we pass a system session to
        // the virtual node type manager

        // todo FIXME it  odd that the *global* virtual node type manager
        // is using a session that is bound to a single specific workspace
        virtNTMgr.setSession(getSystemSession(repConfig.getDefaultWorkspaceName()));

        // now start cluster node as last step
        if (clusterNode != null) {
            try {
                clusterNode.start();
            } catch (ClusterException e) {
                String msg = "Unable to start clustered node, forcing shutdown...";
                log.error(msg, e);
                shutdown();
                throw new RepositoryException(msg, e);
            }
        }

        // amount of time in seconds before an idle workspace is automatically
        // shut down
        int maxIdleTime = repConfig.getWorkspaceMaxIdleTime();
        if (maxIdleTime != 0) {
            // start workspace janitor thread
            Thread wspJanitor = new Thread(new WorkspaceJanitor(maxIdleTime * 1000));
            wspJanitor.setName("WorkspaceJanitor");
            wspJanitor.setPriority(Thread.MIN_PRIORITY);
            wspJanitor.setDaemon(true);
            wspJanitor.start();
        }

        log.info("Repository started");
    }

    /**
     * Get the cache manager of this repository, useful
     * for setting its memory parameters.
     *
     * @return the cache manager
     * @since 1.3
     */
    public CacheManager getCacheManager() {
        return cacheMgr;
    }

    /**
     * Get the item state cache factory of this repository.
     *
     * @return the cache factory
     */
    public ItemStateCacheFactory getItemStateCacheFactory() {
        return cacheFactory;
    }

    /**
     * Creates the version manager.
     *
     * @param vConfig the versioning config
     * @return the newly created version manager
     * @throws RepositoryException if an error occurrs
     */
    protected VersionManagerImpl createVersionManager(VersioningConfig vConfig,
                                                      DelegatingObservationDispatcher delegatingDispatcher)