bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/HandleFactoryImpl.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.bookkeeper.bookie;

import java.io.IOException;
import org.apache.bookkeeper.bookie.LedgerStorage.LedgerDeletionListener;
import org.apache.bookkeeper.util.collections.ConcurrentLongHashMap;

class HandleFactoryImpl implements HandleFactory, LedgerDeletionListener {
    private final ConcurrentLongHashMap<LedgerDescriptor> ledgers;
    private final ConcurrentLongHashMap<LedgerDescriptor> readOnlyLedgers;

    final LedgerStorage ledgerStorage;

    HandleFactoryImpl(LedgerStorage ledgerStorage) {
        this.ledgerStorage = ledgerStorage;
        this.ledgers = ConcurrentLongHashMap.<LedgerDescriptor>newBuilder().build();
        this.readOnlyLedgers = ConcurrentLongHashMap.<LedgerDescriptor>newBuilder().build();

        ledgerStorage.registerLedgerDeletionListener(this);
    }

    @Override
    public LedgerDescriptor getHandle(final long ledgerId, final byte[] masterKey) throws IOException, BookieException {
        LedgerDescriptor handle = ledgers.get(ledgerId);

        if (handle == null) {
            handle = LedgerDescriptor.create(masterKey, ledgerId, ledgerStorage);
            ledgers.putIfAbsent(ledgerId, handle);
        }

        handle.checkAccess(masterKey);
        return handle;
    }

    @Override
    public LedgerDescriptor getReadOnlyHandle(final long ledgerId) throws IOException, Bookie.NoLedgerException {
        LedgerDescriptor handle = readOnlyLedgers.get(ledgerId);

        if (handle == null) {
            handle = LedgerDescriptor.createReadOnly(ledgerId, ledgerStorage);
            readOnlyLedgers.putIfAbsent(ledgerId, handle);
        }

        return handle;
    }

    @Override
    public void ledgerDeleted(long ledgerId) {
        ledgers.remove(ledgerId);
        readOnlyLedgers.remove(ledgerId);
    }
}