/**
* Main method.
*
* <p>Most of the work is done in getHierarchy. This method mainly checks that the parameters are
* the right number and sets the format and recurse fields.
*
* <p>
*
* @see
* #getHierarchyData(HttpServletRequest,SimpleServletSupport,HasRelationships,boolean,boolean,Set)
*/
public void execute(
HttpServletRequest request, HttpServletResponse response, SimpleServletSupport support)
throws IOException, ServletException {
super.execute(request, response, support);
if (VERBOSE) {
System.out.println("BEGIN hierarchy at " + support.getAgentIdentifier());
}
if (testing) {
if (request.getRequestURI().indexOf("PlanePacker") != -1) {
try {
Thread.sleep(30000);
} catch (Exception e) {
}
}
}
// generate our response.
getHierarchy(
response.getOutputStream(),
request,
support,
format,
recurse,
allRelationships,
visitedOrgs);
if (VERBOSE) {
System.out.println("FINISHED hierarchy at " + support.getAgentIdentifier());
}
}
protected void recurseOnSubords(
Set recurseSubOrgSet,
HttpServletRequest request,
SimpleServletSupport support,
boolean allRelationships,
Set visitedOrgs,
HierarchyData hd) {
for (Iterator iter = recurseSubOrgSet.iterator(); iter.hasNext(); ) {
String subOrgName = (String) iter.next();
// fetch the sub's data
HierarchyData subHD = null;
int tries = 5;
long[] timeToWait = new long[] {32000, 16000, 8000, 4000, 2000};
while (subHD == null && tries-- > 0) {
subHD = fetchForSubordinate(request, support, subOrgName, allRelationships, visitedOrgs);
if (subHD == null) {
if (VERBOSE && tries > 1) {
System.out.println(
"At "
+ new Date()
+ " In "
+ support.getAgentIdentifier()
+ ", fetch hierarchy from "
+ subOrgName
+ " returned null, retry in "
+ timeToWait[tries]
+ " millis.");
}
synchronized (this) {
try {
wait(timeToWait[tries]);
} catch (Exception e) {
System.out.println("got exception " + e);
}
}
}
}
if (VERBOSE && (subHD == null)) {
System.out.println(
"In "
+ support.getAgentIdentifier()
+ ", fetch hierarchy from "
+ subOrgName
+ " returned null.");
}
// take Orgs from sub's hierarchy data
int nSubHD = ((subHD != null) ? subHD.numOrgs() : 0);
for (int i = 0; i < nSubHD; i++) {
hd.addOrgData(subHD.getOrgDataAt(i));
}
}
}
/**
* Fetch HierarchyData and write to output.
*
* <p>Main work is done by getHierarchyData, which returns a HierarchyData object.
*
* <p>Output format is either data, xml, or html
*
* @see #getHierarchyData
*/
protected void getHierarchy(
OutputStream out,
HttpServletRequest request,
SimpleServletSupport support,
int format,
boolean recurse,
boolean allRelationships,
Set visitedOrgs) {
// get self org
HasRelationships selfOrg = getSelfOrg(support);
if (selfOrg == null) {
throw new RuntimeException("No self org?");
}
// get hierarchy data
try {
HierarchyData hd =
getHierarchyData(request, support, selfOrg, recurse, allRelationships, visitedOrgs);
writeResponse(hd, out, request, support, format, allRelationships);
} catch (Exception e) {
System.err.println(
"Got exception " + e + " getting hierarchy data for " + support.getAgentIdentifier());
e.printStackTrace();
}
}
/** get the self organization. */
protected HasRelationships getSelfOrg(SimpleServletSupport support) {
// get self org
Collection col = support.queryBlackboard(selfOrgP);
if ((col != null) && (col.size() == 1)) {
Iterator iter = col.iterator();
HasRelationships org = (HasRelationships) iter.next();
return org;
} else {
return null;
}
}
/**
* Writes html with the list of found agents across the top, with links to tables below for each
* agent. The tables show each agents relationships to other agents. There are links in those
* tables too, to the other referenced agents.
*/
protected void writeResponse(
XMLable result,
OutputStream out,
HttpServletRequest request,
SimpleServletSupport support,
int format,
boolean allRelationships) {
if ((format == FORMAT_HTML) && allRelationships) {
HierarchyData data = (HierarchyData) result;
if (VERBOSE)
System.out.println(
"HierarchyWorker.writeResponse - got data for " + data.numOrgs() + " orgs");
PrintWriter writer = new PrintWriter(out);
writer.println(
"<HTML><HEAD>\n<TITLE>"
+ getPrefix()
+ support.getAgentIdentifier()
+ "</TITLE>\n"
+ "</HEAD><BODY>\n"
+ "<H2><CENTER>"
+ getPrefix()
+ support.getAgentIdentifier()
+ "</CENTER></H2><p><pre>\n");
writer.flush();
writer.println(
"<a name=\"top\"/>" + "<TABLE align=center border=0 cellPadding=1 cellSpacing=1>");
boolean rowEnded = false;
int k = 0;
data.sortOrgs();
for (; k < data.numOrgs(); k++) {
Organization org = data.getOrgDataAt(k);
if ((k % AGENTS_IN_ROW) == 0) {
writer.println("<TR>");
rowEnded = false;
}
writer.println(
"<TD><a href=\"#" + org.getPrettyName() + "\"/>" + org.getPrettyName() + "</a></TD>");
if ((k % AGENTS_IN_ROW) == AGENTS_IN_ROW - 1) {
writer.println("</TR>");
rowEnded = true;
}
}
for (int i = (k % AGENTS_IN_ROW); i < AGENTS_IN_ROW; i++) writer.print("<TD></TD>");
if (!rowEnded) writer.println("</TR>");
writer.println("</TABLE><P/><P/><br/>");
for (int i = 0; i < data.numOrgs(); i++) {
Organization org = data.getOrgDataAt(i);
writer.println(
"<P>Agent relationships for <B><a name=\""
+ org.getPrettyName()
+ "\" />"
+ org.getPrettyName()
+ "</B> <a href=\"#top\">[top]</a></P>");
writer.println("<TABLE align=center border=1 cellPadding=1 cellSpacing=1");
writer.println("width=75% bordercolordark=#660000 bordercolorlight=#cc9966>");
writer.println("<TR>");
// writer.println("<TD width=\"25%\"> <FONT color=mediumblue ><B>Agent</FONT></B> </TD>");
writer.println(
"<TD width=\"25%\"> <FONT color=mediumblue ><B>Assigned Agent</FONT></B></TD>");
writer.println("<TD width=\"75%\"> <FONT color=mediumblue ><B>Role </FONT></B></TD>");
writer.println("</TR>");
List relations = org.getRelations();
Collections.sort(relations);
for (Iterator iter = relations.iterator(); iter.hasNext(); ) {
Organization.OrgRelation relation = (Organization.OrgRelation) iter.next();
String relatedOrg = relation.getRelatedOrg();
writer.println(
"<TR><TD><a href=\"#"
+ relatedOrg
+ "\">"
+ relatedOrg
+ "</a></TD><TD>"
+ relation.getName()
+ "</TD></TR>");
}
writer.println("</TABLE><P>");
}
writer.println("\n</BODY></HTML>\n");
writer.flush();
} else {
try {
writeResponse(result, out, request, support, format);
} catch (Exception e) {
System.err.println(
"Got exception " + e + " writing out response for " + support.getAgentIdentifier());
e.printStackTrace();
}
}
}
/**
* recursion happens here -- for each subOrgName subordinate, a new servlet in the target agent
* will be executed
*/
protected HierarchyData fetchForSubordinate(
HttpServletRequest request,
SimpleServletSupport support,
String subOrgName,
boolean allRelationships,
Set visitedOrgs) {
HierarchyData hd = null;
InputStream is = null;
ObjectInputStream ois = null;
try {
// build URL for remote connection
StringBuffer buf = new StringBuffer();
buf.append("http://");
buf.append(request.getServerName());
buf.append(":");
buf.append(request.getServerPort());
buf.append("/$");
buf.append(subOrgName);
buf.append(support.getPath());
buf.append("?data=true&recurse=true&visitedOrgs=");
for (Iterator iter = visitedOrgs.iterator(); iter.hasNext(); ) {
buf.append(iter.next());
if (iter.hasNext()) buf.append(",");
}
if (allRelationships) buf.append("&allRelationships=true");
String url = buf.toString();
if (VERBOSE) {
System.out.println(
"At "
+ new Date()
+ " - in "
+ support.getAgentIdentifier()
+ ", fetch hierarchy from "
+ subOrgName
+ ", URL:\n"
+ url);
}
// open connection
URL myURL = new URL(url);
URLConnection myConnection = myURL.openConnection();
is = myConnection.getInputStream();
ois = new ObjectInputStream(is);
// read single HierarchyData Object from subordinate
hd = (HierarchyData) ois.readObject();
if (VERBOSE) {
System.out.println(
"In "
+ support.getAgentIdentifier()
+ ", got "
+ ((hd != null) ? ("hierarchy[" + hd.numOrgs() + "]") : ("null"))
+ " from "
+ subOrgName);
}
} catch (StreamCorruptedException sce) {
if (VERBOSE) {
System.err.println("In " + support.getAgentIdentifier() + ", got exception : ");
sce.printStackTrace();
}
} catch (FileNotFoundException fnf) {
if (!allRelationships || true) {
System.err.println("In " + support.getAgentIdentifier() + ", got exception : ");
fnf.printStackTrace();
}
} catch (Exception e) {
System.err.println("In " + support.getAgentIdentifier() + ", got exception : ");
e.printStackTrace();
} finally {
try {
if (ois != null) ois.close();
if (is != null) is.close();
} catch (Exception e) {
}
}
return hd;
}
