abstractcluster.java

Java的面向对象数据库系统的源代码

// You can redistribute this software and/or modify it under the terms of
// the Ozone Library License version 1 published by ozone-db.org.
//
// This file is
// Copyright (C) 2003-@year@ Per Nyfelt. All rights reserved.
//
package org.ozoneDB.core.storage;

import org.ozoneDB.core.Env;
import org.ozoneDB.core.Permissions;
import org.ozoneDB.core.ObjectID;
import org.ozoneDB.DxLib.DxMap;

/**
 * @author Per Nyfelt
 */
public abstract class AbstractCluster implements Cluster {

    /**
     * The environment. Will be set by the clusterStore.
     */
    public transient Env env;

    public transient AbstractClusterStore clusterStore;

    protected Permissions permissions;

    protected ClusterID clusterID;

    /**
     * Maps ObjectIDs into StorageObjectContainers.
     */
    protected DxMap containers;

    public DxMap containers() {
        return containers;
    }

    public Env env() {
        return env;
    }

    public void setEnv(Env _env) {
        this.env = _env;
    }

    public void setClusterStore(AbstractClusterStore _clusterStore) {
        this.clusterStore = _clusterStore;
    }

    public Permissions permissions() {
        return permissions;
    }

    public ClusterID clusterID() {
        return clusterID;
    }

    public StorageObjectContainer containerForID(ObjectID id) {
        return (StorageObjectContainer) containers.elementForKey(id);
    }

    public void removeContainer(StorageObjectContainer container) {
        if (containers.removeForKey(container.id()) == null) {
            throw new IllegalStateException("Unable to remove container from cluster.");
        }
    }

    public void registerContainer(StorageObjectContainer container) {
        synchronized (container) {
            container.setCluster(this);
            if (containers.addForKey(container, container.id()) == false) {
                throw new IllegalStateException("Unable to add id " + container.id() + " to cluster " + clusterID());
            }
        }
    }
}