modules/core/src/main/java/org/apache/ignite/internal/processors/cache/persistence/metastorage/MetastorageRowStore.java

/*
 * 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.ignite.internal.processors.cache.persistence.metastorage;

import org.apache.ignite.IgniteCheckedException;
import org.apache.ignite.internal.processors.cache.persistence.IgniteCacheDatabaseSharedManager;
import org.apache.ignite.internal.processors.cache.persistence.freelist.FreeList;

/**
 *
 */
public class MetastorageRowStore {
    /** */
    private final FreeList freeList;

    /** */
    protected final IgniteCacheDatabaseSharedManager db;

    /** */
    public MetastorageRowStore(FreeList freeList, IgniteCacheDatabaseSharedManager db) {
        this.freeList = freeList;
        this.db = db;
    }

    /**
     * @param link Row link.
     * @return Data row.
     */
    public MetastorageDataRow dataRow(String key, long link) throws IgniteCheckedException {
        return ((MetaStorage.FreeListImpl)freeList).readRow(key, link);
    }

    /**
     * @param link Row link.
     * @throws IgniteCheckedException If failed.
     */
    public void removeRow(long link) throws IgniteCheckedException {
        assert link != 0;
        db.checkpointReadLock();

        try {
            freeList.removeDataRowByLink(link);
        }
        finally {
            db.checkpointReadUnlock();
        }
    }

    /**
     * @param row Row.
     * @throws IgniteCheckedException If failed.
     */
    public void addRow(MetastorageDataRow row) throws IgniteCheckedException {
        db.checkpointReadLock();

        try {
            freeList.insertDataRow(row);
        }
        finally {
            db.checkpointReadUnlock();
        }
    }

    /**
     * @param link Row link.
     * @param row New row data.
     * @return {@code True} if was able to update row.
     * @throws IgniteCheckedException If failed.
     */
    public boolean updateRow(long link, MetastorageDataRow row) throws IgniteCheckedException {
        return freeList.updateDataRow(link, row);
    }

    /**
     * @return Free list.
     */
    public FreeList freeList() {
        return freeList;
    }

}