Java Message.writeTo方法代码示例

import org.jgroups.Message; //导入方法依赖的package包/类
@Override
protected void sendMcastDiscoveryRequest(Message msg) {
    try {
        if(msg.getSrc() == null)
            msg.setSrc(local_addr);
        ByteArrayDataOutputStream out=new ByteArrayDataOutputStream(128);
        msg.writeTo(out);
        for(int i=bind_port; i <= bind_port+port_range; i++) {
            DatagramPacket packet=new DatagramPacket(out.buffer(), 0, out.position(), dest_addr, i);
            sock.send(packet);
        }
    }
    catch(Exception ex) {
        log.error("failed sending discovery request", ex);
    }
}
 

import org.jgroups.Message; //导入方法依赖的package包/类
@Test
public void testResponse() throws Exception {
    Address local_addr = pinger.getLocalAddress();
    PhysicalAddress physical_addr = (PhysicalAddress) pinger
            .down(new Event(Event.GET_PHYSICAL_ADDRESS, local_addr));
    PingData data = createPingData(local_addr, physical_addr);
    final PingHeader hdr = getPingHeader(data);
    Message msg = new Message(null).setFlag(Message.Flag.DONT_BUNDLE)
            .putHeader(pinger.getId(), hdr).setBuffer(streamableToBuffer(data));
    URL url = new URL("http://localhost:8888");
    HttpURLConnection conn = (HttpURLConnection) url.openConnection(Proxy.NO_PROXY);
    conn.addRequestProperty(Server.CLUSTER_NAME, TestBase.CLUSTER_NAME);
    conn.setDoOutput(true);
    conn.setRequestMethod("POST");

    DataOutputStream out = new DataOutputStream(conn.getOutputStream());
    msg.writeTo(out);
    out.flush();

    Assert.assertEquals(200, conn.getResponseCode());
}
 

import org.jgroups.Message; //导入方法依赖的package包/类
/**
 * Send all fragments as separate messages (with same ID !).
 * Example:
 * <pre>
 * Given the generated ID is 2344, number of fragments=3, message {dst,src,buf}
 * would be fragmented into:
 * <p/>
 * [2344,3,0]{dst,src,buf1},
 * [2344,3,1]{dst,src,buf2} and
 * [2344,3,2]{dst,src,buf3}
 * </pre>
 */
private void fragment(Message msg, long size) {
    Address            dest=msg.getDest(), src=msg.getSrc();
    long               frag_id=curr_id.getAndIncrement(); // used as seqnos
    int                num_frags;

    try {
        // write message into a byte buffer and fragment it
        ByteArrayDataOutputStream dos=new ByteArrayDataOutputStream((int)(size + 50));
        msg.writeTo(dos);
        byte[] buffer=dos.buffer();
        byte[][] fragments=Util.fragmentBuffer(buffer, frag_size, dos.position());
        num_frags=fragments.length;
        num_sent_frags+=num_frags;

        if(log.isTraceEnabled()) {
            StringBuilder sb=new StringBuilder();
            sb.append("fragmenting packet to ").append(dest != null ? dest.toString() : "<all members>");
            sb.append(" (size=").append(buffer.length).append(") into ").append(num_frags);
            sb.append(" fragment(s) [frag_size=").append(frag_size).append(']');
            log.trace(sb.toString());
        }

        for(int i=0; i < num_frags; i++) {
            Message frag_msg=new Message(dest, src, fragments[i]);
            FragHeader hdr=new FragHeader(frag_id, i, num_frags);
            frag_msg.putHeader(this.id, hdr);
            Event evt=new Event(Event.MSG, frag_msg);
            down_prot.down(evt);
        }
    }
    catch(Exception e) {
        log.error("exception occurred trying to fragment message", e);
    }
}
 

import org.jgroups.Message; //导入方法依赖的package包/类
@Override
protected void sendMcastDiscoveryRequest(Message msg) {
    try {
        if(msg.getSrc() == null)
            msg.setSrc(local_addr);
        ByteArrayDataOutputStream out=new ByteArrayDataOutputStream(128);
        msg.writeTo(out);
        Buffer buf=out.getBuffer();
        DatagramPacket packet=new DatagramPacket(buf.getBuf(), buf.getOffset(), buf.getLength(), mcast_addr, mcast_port);
        if(mcast_send_sockets != null) {
            MulticastSocket s;
            for(int i=0; i < mcast_send_sockets.length; i++) {
                s=mcast_send_sockets[i];
                try {
                    s.send(packet);
                }
                catch(Exception e) {
                    log.error("failed sending packet on socket " + s);
                }
            }
        }
        else { // DEFAULT path
            if(mcast_sock != null)
                mcast_sock.send(packet);
        }
    }
    catch(Exception ex) {
        log.error("failed sending discovery request", ex);
    }
}
 

import org.jgroups.Message; //导入方法依赖的package包/类
protected static final void writeMessage(final Message msg, DataOutputStream out) throws Exception {
    byte flags=0;
    if(msg.getDest() == null)
        flags+=(byte)2;
    out.writeShort(Version.version); // write the version
    out.writeByte(flags);
    msg.writeTo(out);
}
 

import org.jgroups.Message; //导入方法依赖的package包/类
protected Buffer writeMessage(final Message msg) throws Exception {
    dos.position(0);
    byte flags=0;
    dos.writeShort(Version.version); // write the version
    if(msg.getDest() == null)
        flags+=(byte)2;
    dos.writeByte(flags);
    msg.writeTo(dos);
    return new Buffer(dos.buffer(), 0, dos.position());
}
 

import org.jgroups.Message; //导入方法依赖的package包/类
protected static void writeMessage(Message msg, DataOutput dos, boolean multicast) throws Exception {
    byte flags=0;
    dos.writeShort(Version.version); // write the version
    if(multicast)
        flags+=MULTICAST;
    dos.writeByte(flags);
    msg.writeTo(dos);
}