org.dcache.xrootd.protocol.messages.AbstractXrootdResponse.java Source code

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Here is the source code for org.dcache.xrootd.protocol.messages.AbstractXrootdResponse.java

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/**
 * Copyright (C) 2011-2018 dCache.org <support@dcache.org>
 *
 * This file is part of xrootd4j.
 *
 * xrootd4j is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * xrootd4j is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with xrootd4j.  If not, see http://www.gnu.org/licenses/.
 */
package org.dcache.xrootd.protocol.messages;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.util.ReferenceCountUtil;

import static com.google.common.base.Preconditions.checkNotNull;

public abstract class AbstractXrootdResponse<T extends XrootdRequest> implements XrootdResponse<T> {
    protected final T request;
    protected final int stat;

    public AbstractXrootdResponse(T request, int stat) {
        this.request = checkNotNull(request);
        this.stat = stat;
    }

    @Override
    public T getRequest() {
        return request;
    }

    @Override
    public int getStatus() {
        return stat;
    }

    @Override
    public void writeTo(ChannelHandlerContext ctx, ChannelPromise promise) {
        int dlen = getDataLength();
        ByteBuf buffer = ctx.alloc().buffer(8 + dlen);
        try {
            buffer.writeShort(request.getStreamId());
            buffer.writeShort(stat);
            buffer.writeInt(dlen);
            getBytes(buffer);
        } catch (Error | RuntimeException t) {
            promise.setFailure(t);
            buffer.release();
            return;
        } finally {
            ReferenceCountUtil.release(this);
        }
        ctx.write(buffer, promise);
    }

    @Override
    public abstract int getDataLength();

    protected abstract void getBytes(ByteBuf buffer);
}