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Hyperledger Fabric Gateway client API for Java

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/*
 * Copyright 2022 IBM All Rights Reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

package org.hyperledger.fabric.client;

import io.grpc.CallOptions;
import java.util.function.UnaryOperator;

/**
 * A Fabric Gateway call to obtain events.
 * @param  The type of events obtained by this request.
 */
public interface EventsRequest extends Signable {
    /**
     * Get events. The Java gRPC implementation may not begin reading events until the first use of the returned
     * iterator.
     * Note that the returned iterator may throw {@link GatewayRuntimeException} during iteration if a gRPC
     * connection error occurs.
     * @return Ordered sequence of events.
     */
    default CloseableIterator getEvents() {
        return getEvents(GatewayUtils.asCallOptions());
    }

    /**
     * Get events. The Java gRPC implementation may not begin reading events until the first use of the returned
     * iterator.
     * Note that the returned iterator may throw {@link GatewayRuntimeException} during iteration if a gRPC
     * connection error occurs.
     * @param options Function that transforms call options.
     * @return Ordered sequence of events.
     */
    CloseableIterator getEvents(UnaryOperator options);

    /**
     * Get events. The Java gRPC implementation may not begin reading events until the first use of the returned
     * iterator.
     * Note that the returned iterator may throw {@link GatewayRuntimeException} during iteration if a gRPC
     * connection error occurs.
     * @param options Call options.
     * @return Ordered sequence of events.
     * @deprecated Replaced by {@link #getEvents(UnaryOperator)}.
     */
    @Deprecated
    default CloseableIterator getEvents(final CallOption... options) {
        return getEvents(GatewayUtils.asCallOptions(options));
    }
}