WebSocketFrameAssembler.java

/* Copyright 2017 predic8 GmbH, www.predic8.com

   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.predic8.membrane.core.transport.ws;

import com.predic8.membrane.core.exchange.Exchange;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.InputStream;
import java.util.function.Consumer;

public class WebSocketFrameAssembler {

    protected static Logger log = LoggerFactory.getLogger(WebSocketFrameAssembler.class.getName());

    final static int BUFFER_SIZE = 8192;
    private final Exchange originalExchange;

    InputStream in;

    byte[] buffer = new byte[BUFFER_SIZE];

    public WebSocketFrameAssembler(InputStream in, Exchange originalExchange) {
        this.in = in;
        this.originalExchange = originalExchange;
    }

    public synchronized void readFrames(Consumer<WebSocketFrame> consumer) throws IOException {
        int read;
        WebSocketFrame frame = new WebSocketFrame();
        if (originalExchange != null)
            frame.setOriginalExchange(originalExchange);
        int offset = 0;
        int handled;
        while ((read = in.read(buffer, offset, buffer.length - offset)) > 0) {

            offset = offset + read;

            while ((handled = frame.tryRead(buffer, 0, offset)) > 0) {
                consumer.accept(frame);

                System.arraycopy(buffer, handled, buffer, 0, offset - handled);
                offset -= handled;
            }

        }
    }


}