managed-ledger/src/main/java/org/apache/bookkeeper/mledger/Entry.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.mledger;

import io.netty.buffer.ByteBuf;
import org.apache.bookkeeper.common.annotation.InterfaceAudience;
import org.apache.bookkeeper.common.annotation.InterfaceStability;

/**
 * An Entry represent a ledger entry data and its associated position.
 */
@InterfaceAudience.LimitedPrivate
@InterfaceStability.Stable
public interface Entry {

    /**
     * @return the data
     */
    byte[] getData();

    byte[] getDataAndRelease();

    /**
     * @return the entry length in bytes
     */
    int getLength();

    /**
     * @return the data buffer for the entry
     */
    ByteBuf getDataBuffer();

    /**
     * @return the position at which the entry was stored
     */
    Position getPosition();

    /**
     * @return ledgerId of the position
     */
    long getLedgerId();

    /**
     * @return entryId of the position
     */
    long getEntryId();

    /**
     * Release the resources (data) allocated for this entry and recycle if all the resources are deallocated (ref-count
     * of data reached to 0).
     */
    boolean release();
}