/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2008 Sun Microsystems, Inc.
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*/
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package org.opends.server.replication.protocol;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.UnsupportedEncodingException;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.zip.DataFormatException;
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import org.opends.server.replication.common.AssuredMode;
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import org.opends.server.replication.common.ServerStatus;
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/**
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* This message is used by DS to confirm a RS he wants to connect to him (open
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* a session):
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* Handshake sequence between DS and RS is like this:
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* DS --- ServerStartMsg ---> RS
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* DS <--- ReplServerStartMsg --- RS
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* DS --- StartSessionMsg ---> RS
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* DS <--- TopologyMsg --- RS
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*
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* This message contains:
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* - status: the status we are entering the topology with
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* - referrals URLs: the referrals URLs we allow peer DSs to use to refer to
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* our domain when needed.
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*/
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public class StartSessionMsg extends ReplicationMsg
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{
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// The list of referrals URLs to the sending DS
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private List<String> referralsURLs = new ArrayList<String>();
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// The initial status the DS starts with
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private ServerStatus status = ServerStatus.INVALID_STATUS;
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// Assured replication enabled on DS or not
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private boolean assuredFlag = false;
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// DS assured mode (relevant if assured replication enabled)
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private AssuredMode assuredMode = AssuredMode.SAFE_DATA_MODE;
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// DS safe data level (relevant if assured mode is safe data)
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private byte safeDataLevel = (byte) 1;
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/**
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* Creates a new StartSessionMsg message from its encoded form.
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*
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* @param in The byte array containing the encoded form of the message.
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* @throws java.util.zip.DataFormatException If the byte array does not
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* contain a valid encoded form of the message.
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*/
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public StartSessionMsg(byte[] in) throws DataFormatException
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{
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/*
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* The message is stored in the form:
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* <message type><status><assured flag><assured mode><safe data level>
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* <list of referrals urls>
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* (each referral url terminates with 0)
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*/
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try
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{
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/* first byte is the type */
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if (in.length < 1 || in[0] != MSG_TYPE_START_SESSION)
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{
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throw new DataFormatException(
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"Input is not a valid " + this.getClass().getCanonicalName());
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}
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/* Read the status */
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status = ServerStatus.valueOf(in[1]);
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/* Read the assured flag */
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if (in[2] == 1)
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{
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assuredFlag = true;
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} else
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{
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assuredFlag = false;
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}
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/* Read the assured mode */
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assuredMode = AssuredMode.valueOf(in[3]);
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/* Read the safe data level */
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safeDataLevel = in[4];
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/* Read the refferals URLs */
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int pos = 5;
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referralsURLs = new ArrayList<String>();
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while (pos < in.length)
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{
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/*
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* Read the next URL
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* first calculate the length then construct the string
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*/
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int length = getNextLength(in, pos);
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referralsURLs.add(new String(in, pos, length, "UTF-8"));
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pos += length + 1;
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}
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} catch (UnsupportedEncodingException e)
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{
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throw new DataFormatException("UTF-8 is not supported by this jvm.");
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} catch (IllegalArgumentException e)
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{
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throw new DataFormatException(e.getMessage());
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}
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}
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/**
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* Creates a new StartSessionMsg message with the given required parameters.
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* @param status Status we are starting with
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* @param referralsURLs Referrals URLs to be used by peer DSs
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* @param assuredFlag If assured mode is enabled or not
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* @param assuredMode Assured type
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* @param safeDataLevel Assured mode safe data level
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*/
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public StartSessionMsg(ServerStatus status, List<String> referralsURLs,
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boolean assuredFlag, AssuredMode assuredMode, byte safeDataLevel)
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{
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this.referralsURLs = referralsURLs;
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this.status = status;
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this.assuredFlag = assuredFlag;
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this.assuredMode = assuredMode;
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this.safeDataLevel = safeDataLevel;
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}
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/**
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* Creates a new StartSessionMsg message with the given required parameters.
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* Assured mode is false.
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* @param status Status we are starting with
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* @param referralsURLs Referrals URLs to be used by peer DSs
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*/
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public StartSessionMsg(ServerStatus status, List<String> referralsURLs)
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{
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this.referralsURLs = referralsURLs;
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this.status = status;
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this.assuredFlag = false;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public byte[] getBytes()
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{
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/*
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* The message is stored in the form:
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* <message type><status><assured flag><assured mode><safe data level>
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* <list of referrals urls>
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* (each referral url terminates with 0)
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*/
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try
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{
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ByteArrayOutputStream oStream = new ByteArrayOutputStream();
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/* Put the message type */
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oStream.write(MSG_TYPE_START_SESSION);
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// Put the status
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oStream.write(status.getValue());
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// Put the assured flag
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oStream.write(assuredFlag ? (byte) 1 : (byte) 0);
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// Put assured mode
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oStream.write(assuredMode.getValue());
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// Put safe data level
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oStream.write(safeDataLevel);
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// Put the referrals URLs
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if (referralsURLs.size() >= 1)
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{
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for (String url : referralsURLs)
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{
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byte[] byteArrayURL = url.getBytes("UTF-8");
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oStream.write(byteArrayURL);
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oStream.write(0);
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}
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}
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return oStream.toByteArray();
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} catch (IOException e)
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{
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// never happens
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return null;
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}
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}
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/**
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* Get the list of referrals URLs.
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*
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* @return The list of referrals URLs.
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*/
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public List<String> getReferralsURLs()
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{
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return referralsURLs;
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}
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/**
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* Get the status from this message.
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* @return The status.
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*/
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public ServerStatus getStatus()
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{
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return status;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public String toString()
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{
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String urls = "";
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for (String s : referralsURLs)
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{
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urls += s + " | ";
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}
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return ("StartSessionMsg content:\nstatus: " + status +
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"\nassuredFlag: " + assuredFlag +
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"\nassuredMode: " + assuredMode +
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"\nsafeDataLevel: " + safeDataLevel +
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"\nreferralsURLs: " + urls);
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}
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/**
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* Returns true if assured mode is enabled.
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* @return true if assured mode is enabled.
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*/
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public boolean isAssured()
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{
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return assuredFlag;
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}
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/**
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* Get the assured mode.
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* @return the assured mode.
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*/
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public AssuredMode getAssuredMode()
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{
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return assuredMode;
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}
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/**
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* Get the safe data level.
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* @return the safe data level.
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*/
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public byte getSafeDataLevel()
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{
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return safeDataLevel;
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}
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}
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