package org.jdbi.v3;

import java.util.function.Supplier;

class LazyHandle implements Supplier<Handle>, AutoCloseable {
    private final DBI dbi;

    private volatile Handle handle;
    private volatile boolean closed = false;

    public LazyHandle(DBI dbi) {
        this.dbi = dbi;
    }

    public Handle get() {
        if (handle == null) {
            initHandle();
        }
        return handle;
    }

    private synchronized void initHandle() {
        if (handle == null) {
            if (closed) {
                throw new IllegalStateException("Handle is closed");
            }
            handle = dbi.open();
        }
    }

    public synchronized void close() {
        closed = true;
        if (handle != null) {
            handle.close();
        }
    }
}

/*
 * 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 org.jdbi.v3;

import java.util.function.Supplier;

class LazyHandle implements Supplier<Handle>, AutoCloseable {
    private final DBI dbi;

    private volatile Handle handle;
    private volatile boolean closed = false;

    public LazyHandle(DBI dbi) {
        this.dbi = dbi;
    }

    public Handle get() {
        if (handle == null) {
            initHandle();
        }
        return handle;
    }

    private synchronized void initHandle() {
        if (handle == null) {
            if (closed) {
                throw new IllegalStateException("Handle is closed");
            }
            handle = dbi.open();
        }
    }

    public synchronized void close() {
        closed = true;
        if (handle != null) {
            handle.close();
        }
    }
}

Add missing license header