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Jetty example source code file (Holder.java)
The Jetty Holder.java source code// ======================================================================== // Copyright 1996-2005 Mort Bay Consulting Pty. Ltd. // ------------------------------------------------------------------------ // 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. // ======================================================================== package org.mortbay.jetty.servlet; import java.io.Serializable; import java.util.Collections; import java.util.Enumeration; import java.util.HashMap; import java.util.Map; import javax.servlet.UnavailableException; import org.mortbay.component.AbstractLifeCycle; import org.mortbay.log.Log; import org.mortbay.util.Loader; /* --------------------------------------------------------------------- */ /** * @author Greg Wilkins */ public class Holder extends AbstractLifeCycle implements Serializable { protected transient Class _class; protected String _className; protected String _displayName; protected Map _initParams; protected boolean _extInstance; /* ---------------------------------------------------------------- */ protected String _name; protected ServletHandler _servletHandler; protected Holder() {} /* ---------------------------------------------------------------- */ protected Holder(Class held) { _class=held; if (held!=null) { _className=held.getName(); _name=held.getName()+"-"+this.hashCode(); } } /* ------------------------------------------------------------ */ public void doStart() throws Exception { //if no class already loaded and no classname, make servlet permanently unavailable if (_class==null && (_className==null || _className.equals(""))) throw new UnavailableException("No class for Servlet or Filter", -1); //try to load class if (_class==null) { try { _class=Loader.loadClass(Holder.class, _className); if(Log.isDebugEnabled())Log.debug("Holding {}",_class); } catch (Exception e) { Log.warn(e); throw new UnavailableException(e.getMessage(), -1); } } } /* ------------------------------------------------------------ */ public void doStop() { if (!_extInstance) _class=null; } /* ------------------------------------------------------------ */ public String getClassName() { return _className; } /* ------------------------------------------------------------ */ public Class getHeldClass() { return _class; } /* ------------------------------------------------------------ */ public String getDisplayName() { return _displayName; } /* ---------------------------------------------------------------- */ public String getInitParameter(String param) { if (_initParams==null) return null; return (String)_initParams.get(param); } /* ------------------------------------------------------------ */ public Enumeration getInitParameterNames() { if (_initParams==null) return Collections.enumeration(Collections.EMPTY_LIST); return Collections.enumeration(_initParams.keySet()); } /* ---------------------------------------------------------------- */ public Map getInitParameters() { return _initParams; } /* ------------------------------------------------------------ */ public String getName() { return _name; } /* ------------------------------------------------------------ */ /** * @return Returns the servletHandler. */ public ServletHandler getServletHandler() { return _servletHandler; } /* ------------------------------------------------------------ */ public synchronized Object newInstance() throws InstantiationException, IllegalAccessException { if (_class==null) throw new InstantiationException("!"+_className); return _class.newInstance(); } public void destroyInstance(Object instance) throws Exception { } /* ------------------------------------------------------------ */ /** * @param className The className to set. */ public void setClassName(String className) { _className = className; _class=null; } /* ------------------------------------------------------------ */ /** * @param className The className to set. */ public void setHeldClass(Class held) { _class=held; _className = held!=null?held.getName():null; } /* ------------------------------------------------------------ */ public void setDisplayName(String name) { _displayName=name; } /* ------------------------------------------------------------ */ public void setInitParameter(String param,String value) { if (_initParams==null) _initParams=new HashMap(3); _initParams.put(param,value); } /* ---------------------------------------------------------------- */ public void setInitParameters(Map map) { _initParams=map; } /* ------------------------------------------------------------ */ /** * The name is a primary key for the held object. * Ensure that the name is set BEFORE adding a Holder * (eg ServletHolder or FilterHolder) to a ServletHandler. * @param name The name to set. */ public void setName(String name) { _name = name; } /* ------------------------------------------------------------ */ /** * @param servletHandler The {@link ServletHandler} that will handle requests dispatched to this servlet. */ public void setServletHandler(ServletHandler servletHandler) { _servletHandler = servletHandler; } /* ------------------------------------------------------------ */ public String toString() { return _name; } } Other Jetty examples (source code examples)Here is a short list of links related to this Jetty Holder.java source code file: |
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