/*
 * Copyright 2012-2018 Chronicle Map Contributors
 *
 * Licensed 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 net.openhft.chronicle.hash.impl;

import net.openhft.chronicle.core.OS;
import net.openhft.chronicle.hash.impl.util.CanonicalRandomAccessFiles;

import java.io.File;
import java.io.IOException;

public final class PersistedChronicleHashResources extends ChronicleHashResources {

    private File file;

    public PersistedChronicleHashResources(File file) {
        this.file = file;
        OS.memory().storeFence(); // Emulate final semantics of the file field
    }

    @Override
    void releaseMemoryResource(MemoryResource mapping) throws IOException {
        OS.unmap(mapping.address, mapping.size);
    }

    @Override
    Throwable releaseExtraSystemResources() {
        if (file == null)
            return null;
        Throwable thrown = null;
        try {
            CanonicalRandomAccessFiles.release(file);
            file = null;
        } catch (Throwable t) {
            thrown = t;
        }
        return thrown;
    }
}
