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The core jetty server artifact.
//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.server.handler;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.Response;
import org.eclipse.jetty.util.ArrayUtil;
import org.eclipse.jetty.util.Callback;
import org.eclipse.jetty.util.Index;
import org.eclipse.jetty.util.annotation.ManagedAttribute;
import org.eclipse.jetty.util.annotation.ManagedObject;
import org.eclipse.jetty.util.annotation.ManagedOperation;
import org.eclipse.jetty.util.thread.SerializedExecutor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Creates a
* Map of contexts to it's contained handlers based
* on the context path and virtual hosts of any contained {@link ContextHandler}s.
* The contexts do not need to be directly contained, only children of the contained handlers.
* Multiple contexts may have the same context path and they are called in order until one
* handles the request.
*/
@ManagedObject("Context Handler Collection")
public class ContextHandlerCollection extends Handler.Sequence
{
private static final Logger LOG = LoggerFactory.getLogger(ContextHandlerCollection.class);
private final SerializedExecutor _serializedExecutor = new SerializedExecutor();
public ContextHandlerCollection(ContextHandler... contexts)
{
this(true, contexts);
}
/**
* @param dynamic If true, then contexts may be added dynamically once started,
* so the InvocationType is assumed to be BLOCKING, otherwise
* the InvocationType is fixed once started and handlers cannot be
* subsequently added.
* @param contexts The contexts to add.
*/
public ContextHandlerCollection(boolean dynamic, ContextHandler... contexts)
{
super(dynamic, List.of(contexts));
}
/**
* Remap the contexts. Normally this is not required as context
* mapping is maintained as a side effect of {@link #setHandlers(Handler[])}
* However, if configuration changes in the deep handler structure (eg contextpath is changed), then
* this call will trigger a remapping.
* This method is mutually excluded from {@link #deployHandler(Handler, Callback)} and
* {@link #undeployHandler(Handler, Callback)}
*/
@ManagedOperation(value = "Update the mapping of context path to context", impact = "ACTION")
public void mapContexts()
{
_serializedExecutor.execute(() ->
{
List handlers = getHandlers();
if (handlers == null)
return;
super.setHandlers(newHandlers(handlers));
});
}
@Override
protected List newHandlers(List handlers)
{
if (handlers == null || handlers.size() == 0)
return Collections.emptyList();
// Create map of contextPath to handler Branch
// A branch is a Handler that could contain 0 or more ContextHandlers
Map path2Branches = new HashMap<>();
for (Handler handler : handlers)
{
Branch branch = new Branch(handler);
for (String contextPath : branch.getContextPaths())
{
Branch[] branches = path2Branches.get(contextPath);
path2Branches.put(contextPath, ArrayUtil.addToArray(branches, branch, Branch.class));
}
}
// Sort the branches for each contextPath so those with virtual hosts are considered before those without
for (Map.Entry entry : path2Branches.entrySet())
{
Branch[] branches = entry.getValue();
Branch[] sorted = new Branch[branches.length];
int i = 0;
for (Branch branch : branches)
{
if (branch.hasVirtualHost())
sorted[i++] = branch;
}
for (Branch branch : branches)
{
if (!branch.hasVirtualHost())
sorted[i++] = branch;
}
entry.setValue(sorted);
}
Mapping mapping = new Mapping(handlers, path2Branches);
if (LOG.isDebugEnabled())
LOG.debug("{}", mapping._pathBranches);
return mapping;
}
@Override
public boolean handle(Request request, Response response, Callback callback) throws Exception
{
List handlers = getHandlers();
if (handlers == null || handlers.isEmpty())
return false;
if (!(handlers instanceof Mapping))
return super.handle(request, response, callback);
Mapping mapping = (Mapping)getHandlers();
// handle only a single context.
if (handlers.size() == 1)
return handlers.get(0).handle(request, response, callback);
// handle many contexts
Index> pathBranches = mapping._pathBranches;
if (pathBranches == null)
return false;
String path = Request.getPathInContext(request);
if (!path.startsWith("/"))
{
return super.handle(request, response, callback);
}
int limit = path.length() - 1;
while (limit >= 0)
{
// Get best match
Map.Entry branches = pathBranches.getBest(path, 1, limit);
if (branches == null)
break;
int l = branches.getKey().length();
if (l == 1 || path.length() == l || path.charAt(l) == '/')
{
for (Branch branch : branches.getValue())
{
try
{
if (branch.getHandler().handle(request, response, callback))
return true;
}
catch (Throwable t)
{
LOG.warn("Unaccepted error {}", this, t);
}
}
}
limit = l - 2;
}
return false;
}
@ManagedAttribute("The paths of the contexts in this collection")
public Set getContextPaths()
{
List handlers = getHandlers();
if (handlers instanceof Mapping mapping)
{
Index> index = mapping._pathBranches;
return index.keySet().stream()
.map(index::get)
.map(Map.Entry::getValue)
.flatMap(Stream::of)
.flatMap(b -> b.getContextPaths().stream())
.collect(Collectors.toCollection(TreeSet::new));
}
return Set.of();
}
/**
* Thread safe deploy of a Handler.
*
* This method is the equivalent of {@link #addHandler(Handler)},
* but its execution is non-blocking and mutually excluded from all
* other callers to itself and {@link #undeployHandler(Handler, Callback)}.
* The handler may be added after this call returns.
*
*
* @param handler the handler to deploy
* @param callback Called after handler has been added
*/
public void deployHandler(Handler handler, Callback callback)
{
_serializedExecutor.execute(new SerializedExecutor.ErrorHandlingTask()
{
@Override
public void run()
{
addHandler(handler);
callback.succeeded();
}
@Override
public void accept(Throwable throwable)
{
callback.failed(throwable);
}
});
}
/**
* Thread safe undeploy of a Handler.
*
* This method is the equivalent of {@link #removeHandler(Handler)},
* but its execution is non-block and mutually excluded from all
* other calls to {@link #deployHandler(Handler, Callback)} and
* itself. The handler may be removed after this call returns.
*
*
* @param handler The handler to undeploy
* @param callback Called after handler has been removed
*/
public void undeployHandler(Handler handler, Callback callback)
{
_serializedExecutor.execute(new SerializedExecutor.ErrorHandlingTask()
{
@Override
public void run()
{
removeHandler(handler);
callback.succeeded();
}
@Override
public void accept(Throwable throwable)
{
callback.failed(throwable);
}
});
}
private static final class Branch
{
private final Handler _handler;
private final List _contexts;
Branch(Handler handler)
{
_handler = handler;
if (handler instanceof ContextHandler)
{
_contexts = List.of((ContextHandler)handler);
}
else if (handler instanceof Handler.Container)
{
List contexts = ((Handler.Container)handler).getDescendants(ContextHandler.class);
_contexts = new ArrayList<>(contexts);
}
else
_contexts = List.of();
}
Set getContextPaths()
{
Set set = new HashSet<>();
for (ContextHandler context : _contexts)
{
set.add(context.getContextPath());
}
return set;
}
boolean hasVirtualHost()
{
for (ContextHandler context : _contexts)
{
if (context.getVirtualHosts() != null && context.getVirtualHosts().size() > 0)
return true;
}
return false;
}
Handler getHandler()
{
return _handler;
}
@Override
public String toString()
{
return String.format("{%s,%s}", _handler, _contexts);
}
}
private static class Mapping extends ArrayList
{
private final Index> _pathBranches;
private Mapping(List handlers, Map path2Branches)
{
super(handlers);
_pathBranches = new Index.Builder>()
.caseSensitive(true)
.withAll(() ->
{
Map> result = new LinkedHashMap<>();
for (Map.Entry entry : path2Branches.entrySet())
{
result.put(entry.getKey().substring(1), entry);
}
return result;
})
.build();
}
}
}
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