io.reactiverse.pgclient.impl.PgCursorImpl.java Source code

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Here is the source code for io.reactiverse.pgclient.impl.PgCursorImpl.java

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/*
 * Copyright (C) 2017 Julien Viet
 *
 * 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 io.reactiverse.pgclient.impl;

import io.reactiverse.pgclient.*;
import io.vertx.core.AsyncResult;
import io.vertx.core.Future;
import io.vertx.core.Handler;

import java.util.*;

/**
 * @author <a href="mailto:julien@julienviet.com">Julien Viet</a>
 */
public class PgCursorImpl implements PgCursor {

    private final PgPreparedQueryImpl ps;
    private final Tuple params;

    private String portal;
    private boolean closed;
    private PgResultBuilder<PgRowSet, PgRowSetImpl, PgRowSet> result;

    PgCursorImpl(PgPreparedQueryImpl ps, Tuple params) {
        this.ps = ps;
        this.params = params;
    }

    @Override
    public synchronized boolean hasMore() {
        if (result == null) {
            throw new IllegalStateException("No current cursor read");
        }
        return result.isSuspended();
    }

    @Override
    public synchronized void read(int count, Handler<AsyncResult<PgRowSet>> handler) {
        if (portal == null) {
            portal = UUID.randomUUID().toString();
            result = new PgResultBuilder<>(PgRowSetImpl.FACTORY, handler);
            ps.execute(params, count, portal, false, false, PgRowSetImpl.COLLECTOR, result, result);
        } else if (result.isSuspended()) {
            result = new PgResultBuilder<>(PgRowSetImpl.FACTORY, handler);
            ps.execute(params, count, portal, true, false, PgRowSetImpl.COLLECTOR, result, result);
        } else {
            throw new IllegalStateException();
        }
    }

    @Override
    public synchronized void close(Handler<AsyncResult<Void>> completionHandler) {
        if (!closed) {
            closed = true;
            if (portal == null) {
                completionHandler.handle(Future.succeededFuture());
            } else {
                String p = portal;
                portal = null;
                result = null;
                ps.closePortal(p, completionHandler);
            }
        }
    }
}