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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2000-2009. All Rights Reserved.
*
* 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.
*
* %CopyrightEnd%
*/
package com.ericsson.otp.erlang;
/**
* This class represents local node types. It is used to group the node types
* {@link OtpNode OtpNode} and {@link OtpSelf OtpSelf}.
*/
public class OtpLocalNode extends AbstractNode {
private int serial = 0;
private int pidCount = 1;
private int portCount = 1;
private int refId[];
protected int port;
protected OtpTransport epmd;
/**
* Create a node with the given name and the default cookie.
*/
protected OtpLocalNode(final String node) {
super(node);
init();
}
/**
* Create a node with the given name, transport factory and the default
* cookie.
*/
protected OtpLocalNode(final String node,
final OtpTransportFactory transportFactory) {
super(node, transportFactory);
init();
}
/**
* Create a node with the given name and cookie.
*/
protected OtpLocalNode(final String node, final String cookie) {
super(node, cookie);
init();
}
/**
* Create a node with the given name, cookie and transport factory.
*/
protected OtpLocalNode(final String node, final String cookie,
final OtpTransportFactory transportFactory) {
super(node, cookie, transportFactory);
init();
}
private void init() {
serial = 0;
pidCount = 1;
portCount = 1;
refId = new int[3];
refId[0] = 1;
refId[1] = 0;
refId[2] = 0;
}
/**
* Get the port number used by this node.
*
* @return the port number this server node is accepting connections on.
*/
public int port() {
return port;
}
/**
* Set the Epmd socket after publishing this nodes listen port to Epmd.
*
* @param s
* The socket connecting this node to Epmd.
*/
protected void setEpmd(final OtpTransport s) {
epmd = s;
}
/**
* Get the Epmd socket.
*
* @return The socket connecting this node to Epmd.
*/
protected OtpTransport getEpmd() {
return epmd;
}
/**
* Create an Erlang {@link OtpErlangPid pid}. Erlang pids are based upon
* some node specific information; this method creates a pid using the
* information in this node. Each call to this method produces a unique pid.
*
* @return an Erlang pid.
*/
public synchronized OtpErlangPid createPid() {
final OtpErlangPid p = new OtpErlangPid(node, pidCount, serial,
creation);
pidCount++;
if (pidCount > 0x7fff) {
pidCount = 0;
serial++;
if (serial > 0x1fff) { /* 13 bits */
serial = 0;
}
}
return p;
}
/**
* Create an Erlang {@link OtpErlangPort port}. Erlang ports are based upon
* some node specific information; this method creates a port using the
* information in this node. Each call to this method produces a unique
* port. It may not be meaningful to create a port in a non-Erlang
* environment, but this method is provided for completeness.
*
* @return an Erlang port.
*/
public synchronized OtpErlangPort createPort() {
final OtpErlangPort p = new OtpErlangPort(node, portCount, creation);
portCount++;
if (portCount > 0xfffffff) { /* 28 bits */
portCount = 0;
}
return p;
}
/**
* Create an Erlang {@link OtpErlangRef reference}. Erlang references are
* based upon some node specific information; this method creates a
* reference using the information in this node. Each call to this method
* produces a unique reference.
*
* @return an Erlang reference.
*/
public synchronized OtpErlangRef createRef() {
final OtpErlangRef r = new OtpErlangRef(node, refId, creation);
// increment ref ids (3 ints: 18 + 32 + 32 bits)
refId[0]++;
if (refId[0] > 0x3ffff) {
refId[0] = 0;
refId[1]++;
if (refId[1] == 0) {
refId[2]++;
}
}
return r;
}
}
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