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package org.glassfish.grizzly.thrift;

import org.apache.thrift.transport.TTransport;
import org.apache.thrift.transport.TTransportException;
import org.glassfish.grizzly.Buffer;
import org.glassfish.grizzly.utils.BufferOutputStream;

import java.io.IOException;

/**
 * Abstract class for implementing thrift's TTransport.
 * By using BufferOutputStream, the output buffer will be increased automatically by given MemoryManager if it doesn't have enough spaces.
 *
 * @author Bongjae Chang
 */
public abstract class AbstractTGrizzlyTransport extends TTransport {

    @Override
    public void open() throws TTransportException {
    }

    @Override
    public int read(byte[] buf, int off, int len) throws TTransportException {
        final Buffer input = getInputBuffer();
        final int readableBytes = input.remaining();
        final int bytesToRead = len > readableBytes ? readableBytes : len;
        input.get(buf, off, bytesToRead);
        return bytesToRead;
    }

    @Override
    public void write(byte[] buf, int off, int len) throws TTransportException {
        final BufferOutputStream outputStream = getOutputStream();
        if (outputStream != null) {
            try {
                outputStream.write(buf, off, len);
            } catch (IOException ie) {
                throw new TTransportException(ie);
            }
        }
    }

    @Override
    public abstract void flush() throws TTransportException;

    protected abstract Buffer getInputBuffer() throws TTransportException;

    protected abstract BufferOutputStream getOutputStream() throws TTransportException;
}