com.google.gerrit.httpd.ReviewDbDataSourceProvider.java Source code

Introduction

Here is the source code for com.google.gerrit.httpd.ReviewDbDataSourceProvider.java

Source

// Copyright (C) 2009 The Android Open Source Project
//
// 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 com.google.gerrit.httpd;

import com.google.gerrit.extensions.events.LifecycleListener;
import com.google.inject.Provider;
import com.google.inject.ProvisionException;
import com.google.inject.Singleton;

import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;

/** Provides access to the {@code ReviewDb} DataSource. */
@Singleton
final class ReviewDbDataSourceProvider implements Provider<DataSource>, LifecycleListener {
    private DataSource ds;

    @Override
    public synchronized DataSource get() {
        if (ds == null) {
            ds = open();
        }
        return ds;
    }

    @Override
    public void start() {
    }

    @Override
    public synchronized void stop() {
        if (ds != null) {
            closeDataSource(ds);
        }
    }

    private DataSource open() {
        final String dsName = "java:comp/env/jdbc/ReviewDb";
        try {
            return (DataSource) new InitialContext().lookup(dsName);
        } catch (NamingException namingErr) {
            throw new ProvisionException("No DataSource " + dsName, namingErr);
        }
    }

    private void closeDataSource(final DataSource ds) {
        try {
            Class<?> type = Class.forName("org.apache.commons.dbcp.BasicDataSource");
            if (type.isInstance(ds)) {
                type.getMethod("close").invoke(ds);
                return;
            }
        } catch (Throwable bad) {
            // Oh well, its not a Commons DBCP pooled connection.
        }

        try {
            Class<?> type = Class.forName("com.mchange.v2.c3p0.DataSources");
            if (type.isInstance(ds)) {
                type.getMethod("destroy", DataSource.class).invoke(null, ds);
                return;
            }
        } catch (Throwable bad) {
            // Oh well, its not a c3p0 pooled connection.
        }
    }
}