Java tutorial
/* * jPOS Project [http://jpos.org] * Copyright (C) 2000-2016 Alejandro P. Revilla * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * This program 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 Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package org.jpos.util; import org.jdom2.Element; import org.jdom2.output.Format; import org.jdom2.output.XMLOutputter; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.PrintStream; import java.sql.SQLException; import java.time.Duration; import java.time.Instant; import java.time.LocalDateTime; import java.time.ZoneId; import java.util.*; /** * @author @apr */ public class LogEvent { private LogSource source; private String tag; private final List<Object> payLoad; private Instant createdAt; private Instant dumpedAt; private boolean honorSourceLogger; private boolean noArmor; public LogEvent(String tag) { super(); this.tag = tag; createdAt = Instant.now(); this.payLoad = Collections.synchronizedList(new ArrayList<Object>()); } public LogEvent() { this("info"); } public LogEvent(String tag, Object msg) { this(tag); addMessage(msg); } public LogEvent(LogSource source, String tag) { this(tag); this.source = source; honorSourceLogger = true; } public LogEvent(LogSource source, String tag, Object msg) { this(tag); this.source = source; honorSourceLogger = true; addMessage(msg); } public String getTag() { return tag; } public void addMessage(Object msg) { payLoad.add(msg); } public void addMessage(String tagname, String message) { payLoad.add("<" + tagname + ">" + message + "</" + tagname + ">"); } public LogSource getSource() { return source; } public void setSource(LogSource source) { this.source = source; } public void setNoArmor(boolean noArmor) { this.noArmor = noArmor; } protected String dumpHeader(PrintStream p, String indent) { if (noArmor) { p.println(""); } else { if (dumpedAt == null) dumpedAt = Instant.now(); StringBuilder sb = new StringBuilder(indent); sb.append("<log realm=\""); sb.append(getRealm()); sb.append("\" at=\""); sb.append(LocalDateTime.ofInstant(dumpedAt, ZoneId.systemDefault())); sb.append('"'); long elapsed = Duration.between(createdAt, dumpedAt).toMillis(); if (elapsed > 0) { sb.append(" lifespan=\""); sb.append(elapsed); sb.append("ms\""); } sb.append('>'); p.println(sb.toString()); } return indent + " "; } protected void dumpTrailer(PrintStream p, String indent) { if (!noArmor) p.println(indent + "</log>"); } public void dump(PrintStream p, String outer) { String indent = dumpHeader(p, outer); if (payLoad.isEmpty()) { if (tag != null) p.println(indent + "<" + tag + "/>"); } else { String newIndent; if (tag != null) { p.println(indent + "<" + tag + ">"); newIndent = indent + " "; } else newIndent = ""; synchronized (payLoad) { for (Object o : payLoad) { if (o instanceof Loggeable) ((Loggeable) o).dump(p, newIndent); else if (o instanceof SQLException) { SQLException e = (SQLException) o; p.println(newIndent + "<SQLException>" + e.getMessage() + "</SQLException>"); p.println(newIndent + "<SQLState>" + e.getSQLState() + "</SQLState>"); p.println(newIndent + "<VendorError>" + e.getErrorCode() + "</VendorError>"); ((Throwable) o).printStackTrace(p); } else if (o instanceof Throwable) { p.println(newIndent + "<exception name=\"" + ((Throwable) o).getMessage() + "\">"); p.print(newIndent); ((Throwable) o).printStackTrace(p); p.println(newIndent + "</exception>"); } else if (o instanceof Object[]) { Object[] oa = (Object[]) o; p.print(newIndent + "["); for (int j = 0; j < oa.length; j++) { if (j > 0) p.print(","); p.print(oa[j].toString()); } p.println("]"); } else if (o instanceof Element) { p.println(""); p.println(newIndent + "<![CDATA["); XMLOutputter out = new XMLOutputter(Format.getPrettyFormat()); out.getFormat().setLineSeparator("\n"); try { out.output((Element) o, p); } catch (IOException ex) { ex.printStackTrace(p); } p.println(""); p.println(newIndent + "]]>"); } else if (o != null) { p.println(newIndent + o.toString()); } else { p.println(newIndent + "null"); } } } if (tag != null) p.println(indent + "</" + tag + ">"); } dumpTrailer(p, outer); } public String getRealm() { return source != null ? source.getRealm() : ""; } /** * WARNING: payLoad is a SynchronizedList. If you intend to get a reference * to it in order to iterate over the list, you need to synchronize on the * returned object. * * <pre> * synchronized (evt.getPayLoad()) { * Iterator iter = evt.getPayLoad().iterator(); * while (iter.hasNext()) { * ... * ... * * } * } * </pre> * @return payLoad, which is a SynchronizedList */ public List<Object> getPayLoad() { return payLoad; } public String toString(String indent) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); PrintStream p = new PrintStream(baos); dump(p, indent); return baos.toString(); } public String toString() { return toString(""); } /** * This is a hack for backward compatibility after accepting PR67 * @see <a href="https://github.com/jpos/jPOS/pull/67">PR67</a> * @return true if ISOSource has been set */ public boolean isHonorSourceLogger() { return honorSourceLogger; } }