123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169 |
- /*
- * Copyright (c) 2006-2013 DMDirc Developers
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
- package com.dmdirc;
-
- import com.dmdirc.parser.interfaces.Parser;
- import com.dmdirc.util.collections.RollingList;
-
- import java.util.ArrayList;
- import java.util.List;
-
- /**
- * Describes the status of a server and manages transitions between different
- * states.
- *
- * @since 0.6.3m1
- */
- public class ServerStatus {
-
- /** The server to which this status belongs. */
- protected final Server server;
-
- /** Object to notify when the state of the server changes. */
- protected final Object notifier;
-
- /** The current state of the server. */
- protected ServerState state = ServerState.DISCONNECTED;
-
- /** A history of transactions for debugging purposes. */
- protected RollingList<String> history = new RollingList<String>(10);
-
- /** A list of known parser hashcodes. */
- protected final List<Integer> parsers = new ArrayList<Integer>();
-
- /**
- * Creates a new ServerStatus instance for the specified server.
- *
- * @param server The server to which this status belongs
- * @param notifier The object to notify when the state changes
- * @since 0.6.3
- */
- public ServerStatus(final Server server, final Object notifier) {
- this.server = server;
- this.notifier = notifier;
- }
-
- /**
- * Transitions the status of this object to the specified state.
- *
- * @param newState The state to transition to
- * @throws IllegalArgumentException If the specified transition is invalid
- */
- public synchronized void transition(final ServerState newState) {
- addHistoryEntry(state, newState);
-
- if (state.canTransitionTo(newState)) {
- state = newState;
-
- synchronized (notifier) {
- notifier.notifyAll();
- }
- } else {
- throw new IllegalArgumentException("Illegal server state "
- + "transition\n\n" + getTransitionHistory());
- }
- }
-
- /**
- * Retrieves the current state of this status object.
- *
- * @return This object's current state
- */
- public synchronized ServerState getState() {
- return state;
- }
-
- /**
- * Adds a history entry to this status object. The history entry contains
- * the name of the states being transitioned between, the details of the
- * method (and class and line) which initiated the transition, and the
- * name of the thread in which the transition is occuring.
- *
- * @param fromState The state which is being transitioned from
- * @param toState The state which is being transitioned to
- */
- protected void addHistoryEntry(final ServerState fromState, final ServerState toState) {
- final StringBuilder builder = new StringBuilder();
- builder.append(fromState.name());
- builder.append('→');
- builder.append(toState.name());
- builder.append(' ');
- builder.append(Thread.currentThread().getStackTrace()[3].toString());
- builder.append(" [");
- builder.append(Thread.currentThread().getName());
- builder.append("] (parser #");
- builder.append(getParserID(server.getParser()));
- builder.append(')');
-
- history.add(builder.toString());
- }
-
- /**
- * Retrieves the transition history of this status object as a string.
- *
- * @see #addHistoryEntry(com.dmdirc.ServerState, com.dmdirc.ServerState)
- * @return A line feed ('\n') delimited string containing one entry for
- * each of the entries in this status's transition history.
- */
- public String getTransitionHistory() {
- final StringBuilder builder = new StringBuilder();
-
- for (String line : history.getList()) {
- if (builder.length() > 0) {
- builder.append('\n');
- }
-
- builder.append(line);
- }
-
- return builder.toString();
- }
-
- /**
- * Returns a unique, ID for the specified parser. Each parser that has been
- * seen to be used by this server is given a sequential id.
- *
- * @param parser The parser whose ID is being requested
- * @return A unique ID for the specified parser, or 0 if the parser is null
- */
- public int getParserID(final Parser parser) {
- if (parser == null) {
- return 0;
- }
-
- final int hashcode = parser.hashCode();
- int offset;
-
- synchronized (parsers) {
- offset = parsers.indexOf(hashcode);
-
- if (offset == -1) {
- parsers.add(hashcode);
- offset = parsers.indexOf(hashcode);
- }
- }
-
- return 1 + offset;
- }
-
- }
|