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Berkeley DB Java Edition is a open source, transactional storage solution for Java applications. The Direct Persistence Layer (DPL) API is faster and easier to develop, deploy, and manage than serialized object files or ORM-based Java persistence solutions. The Collections API enhances the standard java.util.collections classes allowing them to be persisted to a local file system and accessed concurrently while protected by ACID transactions. Data is stored by serializing objects and managing class and instance data separately so as not to waste space. Berkeley DB Java Edition is the reliable drop-in solution for complex, fast, and scalable storage. Source for this release is in 'je-4.0.92-sources.jar', the Javadoc is located at 'http://download.oracle.com/berkeley-db/docs/je/4.0.92/'.

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/*-
 * Copyright (C) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
 *
 * This file was distributed by Oracle as part of a version of Oracle Berkeley
 * DB Java Edition made available at:
 *
 * http://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html
 *
 * Please see the LICENSE file included in the top-level directory of the
 * appropriate version of Oracle Berkeley DB Java Edition for a copy of the
 * license and additional information.
 */

package com.sleepycat.je;

import static com.sleepycat.je.dbi.TxnStatDefinition.TXN_ABORTS;
import static com.sleepycat.je.dbi.TxnStatDefinition.TXN_ACTIVE;
import static com.sleepycat.je.dbi.TxnStatDefinition.TXN_ACTIVE_TXNS;
import static com.sleepycat.je.dbi.TxnStatDefinition.TXN_BEGINS;
import static com.sleepycat.je.dbi.TxnStatDefinition.TXN_COMMITS;
import static com.sleepycat.je.dbi.TxnStatDefinition.TXN_XAABORTS;
import static com.sleepycat.je.dbi.TxnStatDefinition.TXN_XACOMMITS;
import static com.sleepycat.je.dbi.TxnStatDefinition.TXN_XAPREPARES;

import java.io.Serializable;

import com.sleepycat.je.utilint.StatGroup;

/**
 * Transaction statistics for a database environment.
 */
public class TransactionStats implements Serializable {

    private static final long serialVersionUID = 2136955031L;

    private StatGroup stats;

    /**
     * @hidden
     * Internal use only.
     */
    public TransactionStats(StatGroup stats) {
        this.stats = stats;
    }

    /**
     * The Active class represents an active transaction.
     */
    public static class Active implements Serializable {

        private static final long serialVersionUID = 1286693589L;

        /**
         * The transaction ID of the transaction.
         */
        private long txnId;

        /**
         * The transaction ID of the parent transaction (or 0, if no parent).
         */
        private long parentId;

        /**
         * The transaction name, including the thread name if available.
         */
        private String name;

        /**
         * The transaction ID of the transaction.
         */
        public long getId() {
            return txnId;
        }

        /**
         * The transaction ID of the parent transaction (or 0, if no parent).
         */
        public long getParentId() {
            return parentId;
        }

        /**
         * The transaction name, including the thread name if available.
         */
        public String getName() {
            return name;
        }

        /**
         * @hidden
         * Internal use only.
         */
        public Active(String name, long txnId, long parentId) {
            this.name = name;
            this.txnId = txnId;
            this.parentId = parentId;
        }

        @Override
        public String toString() {
            return "txnId = " + txnId + " txnName = " + name;
        }
    }

    /**
     * Return the array of active transactions.
     *
     * @return The array of active transactions.
     */
    public Active[] getActiveTxns() {
        return stats.getActiveTxnArray(TXN_ACTIVE_TXNS);
    }

    /**
     * The number of transactions that have aborted.
     */
    public long getNAborts() {
        return stats.getLong(TXN_ABORTS);
    }

    /**
     * The number of XA transactions that have aborted.
     */
    public long getNXAAborts() {
        return stats.getLong(TXN_XAABORTS);
    }

    /**
     * The number of XA transactions that have been prepared.
     */
    public long getNXAPrepares() {
        return stats.getLong(TXN_XAPREPARES);
    }

    /**
     * The number of transactions that are currently active.
     */
    public int getNActive() {
        return stats.getInt(TXN_ACTIVE);
    }

    /**
     * The number of transactions that have begun.
     */
    public long getNBegins() {
        return stats.getLong(TXN_BEGINS);
    }

    /**
     * The number of transactions that have committed.
     */
    public long getNCommits() {
        return stats.getLong(TXN_COMMITS);
    }

    /**
     * The number of XA transactions that have committed.
     */
    public long getNXACommits() {
        return stats.getLong(TXN_XACOMMITS);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
        return stats.toString();
    }

    public String toStringVerbose() {
        return stats.toStringVerbose();
    }
}