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/*
* Copyright 2000-2022 Vaadin Ltd.
*
* 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.vaadin.client.communication;
import com.google.gwt.user.client.Command;
import com.vaadin.client.ApplicationConnection;
import com.vaadin.shared.ui.ui.UIState.PushConfigurationState;
import elemental.json.JsonObject;
/**
* Represents the client-side endpoint of a bidirectional ("push") communication
* channel. Can be used to send UIDL request messages to the server and to
* receive UIDL messages from the server (either asynchronously or as a response
* to a UIDL request.) Delegates the UIDL handling to the
* {@link ApplicationConnection}.
*
* @author Vaadin Ltd
* @since 7.1
*/
public interface PushConnection {
/**
* Two-phase construction to allow using GWT.create().
*
* @param connection
* The ApplicationConnection
*/
public void init(ApplicationConnection connection,
PushConfigurationState pushConfigurationState);
/**
* Pushes a message to the server. Will throw an exception if the connection
* is not active (see {@link #isActive()}).
* <p>
* Implementation detail: If the push connection is not connected and the
* message can thus not be sent, the implementation must call
* {@link ConnectionStateHandler#pushNotConnected(JsonObject)}, which will
* retry the send later.
* <p>
* This method must not be called if the push connection is not
* bidirectional (if {@link #isBidirectional()} returns false)
*
* @param payload
* the payload to push
* @throws IllegalStateException
* if this connection is not active
*
* @see #isActive()
*/
public void push(JsonObject payload);
/**
* Checks whether this push connection is in a state where it can push
* messages to the server. A connection is active until
* {@link #disconnect(Command)} has been called.
*
* @return <code>true</code> if this connection can accept new messages;
* <code>false</code> if this connection is disconnected or
* disconnecting.
*/
public boolean isActive();
/**
* Closes the push connection. To ensure correct message delivery order, new
* messages should not be sent using any other channel until it has been
* confirmed that all messages pending for this connection have been
* delivered. The provided command callback is invoked when messages can be
* passed using some other communication channel.
* <p>
* After this method has been called, {@link #isActive()} returns
* <code>false</code>. Calling this method for a connection that is no
* longer active will throw an exception.
*
* @param command
* callback command invoked when the connection has been properly
* disconnected
* @throws IllegalStateException
* if this connection is not active
*/
public void disconnect(Command command);
/**
* Returns a human readable string representation of the transport type used
* to communicate with the server.
*
* @since 7.1
* @return A human readable string representation of the transport type
*/
public String getTransportType();
/**
* Checks whether this push connection should be used for communication in
* both directions or if an XHR should be used for client to server
* communication.
*
* A bidirectional push connection must be able to reliably inform about its
* connection state.
*
* @since 7.6
* @return true if the push connection should be used for messages in both
* directions, false if it should only be used for server to client
* messages
*/
public boolean isBidirectional();
}
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