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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.solr.handler.component;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.SolrException.ErrorCode;
import org.apache.solr.common.params.CommonParams;
import org.apache.solr.common.params.ModifiableSolrParams;
import org.apache.solr.common.params.ShardParams;
import org.apache.solr.common.util.ContentStream;
import org.apache.solr.core.CloseHook;
import org.apache.solr.core.PluginInfo;
import org.apache.solr.core.SolrCore;
import org.apache.solr.handler.RequestHandlerBase;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.response.SolrQueryResponse;
import org.apache.solr.util.RTimer;
import org.apache.solr.util.SolrPluginUtils;
import org.apache.solr.util.plugin.PluginInfoInitialized;
import org.apache.solr.util.plugin.SolrCoreAware;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
/**
*
* Refer SOLR-281
*
*/
public class SearchHandler extends RequestHandlerBase implements SolrCoreAware , PluginInfoInitialized
{
static final String INIT_COMPONENTS = "components";
static final String INIT_FIRST_COMPONENTS = "first-components";
static final String INIT_LAST_COMPONENTS = "last-components";
protected static Logger log = LoggerFactory.getLogger(SearchHandler.class);
protected List components = null;
private ShardHandlerFactory shardHandlerFactory ;
private PluginInfo shfInfo;
protected List getDefaultComponents()
{
ArrayList names = new ArrayList(6);
names.add( QueryComponent.COMPONENT_NAME );
names.add( FacetComponent.COMPONENT_NAME );
names.add( MoreLikeThisComponent.COMPONENT_NAME );
names.add( HighlightComponent.COMPONENT_NAME );
names.add( StatsComponent.COMPONENT_NAME );
names.add( DebugComponent.COMPONENT_NAME );
return names;
}
@Override
public void init(PluginInfo info) {
init(info.initArgs);
for (PluginInfo child : info.children) {
if("shardHandlerFactory".equals(child.type)){
this.shfInfo = child;
break;
}
}
}
/**
* Initialize the components based on name. Note, if using INIT_FIRST_COMPONENTS or INIT_LAST_COMPONENTS,
* then the {@link DebugComponent} will always occur last. If this is not desired, then one must explicitly declare all components using
* the INIT_COMPONENTS syntax.
*/
@Override
@SuppressWarnings("unchecked")
public void inform(SolrCore core)
{
Object declaredComponents = initArgs.get(INIT_COMPONENTS);
List first = (List) initArgs.get(INIT_FIRST_COMPONENTS);
List last = (List) initArgs.get(INIT_LAST_COMPONENTS);
List list = null;
boolean makeDebugLast = true;
if( declaredComponents == null ) {
// Use the default component list
list = getDefaultComponents();
if( first != null ) {
List clist = first;
clist.addAll( list );
list = clist;
}
if( last != null ) {
list.addAll( last );
}
}
else {
list = (List)declaredComponents;
if( first != null || last != null ) {
throw new SolrException( SolrException.ErrorCode.SERVER_ERROR,
"First/Last components only valid if you do not declare 'components'");
}
makeDebugLast = false;
}
// Build the component list
components = new ArrayList( list.size() );
DebugComponent dbgCmp = null;
for(String c : list){
SearchComponent comp = core.getSearchComponent( c );
if (comp instanceof DebugComponent && makeDebugLast == true){
dbgCmp = (DebugComponent) comp;
} else {
components.add(comp);
log.debug("Adding component:"+comp);
}
}
if (makeDebugLast == true && dbgCmp != null){
components.add(dbgCmp);
log.debug("Adding debug component:" + dbgCmp);
}
if(shfInfo ==null) {
shardHandlerFactory = core.getCoreDescriptor().getCoreContainer().getShardHandlerFactory();
} else {
shardHandlerFactory = core.createInitInstance(shfInfo, ShardHandlerFactory.class, null, null);
core.addCloseHook(new CloseHook() {
@Override
public void preClose(SolrCore core) {
shardHandlerFactory.close();
}
@Override
public void postClose(SolrCore core) {
}
});
}
}
public List getComponents() {
return components;
}
@Override
public void handleRequestBody(SolrQueryRequest req, SolrQueryResponse rsp) throws Exception
{
// int sleep = req.getParams().getInt("sleep",0);
// if (sleep > 0) {log.error("SLEEPING for " + sleep); Thread.sleep(sleep);}
if (req.getContentStreams() != null && req.getContentStreams().iterator().hasNext()) {
throw new SolrException(ErrorCode.BAD_REQUEST, "Search requests cannot accept content streams");
}
ResponseBuilder rb = new ResponseBuilder(req, rsp, components);
if (rb.requestInfo != null) {
rb.requestInfo.setResponseBuilder(rb);
}
boolean dbg = req.getParams().getBool(CommonParams.DEBUG_QUERY, false);
rb.setDebug(dbg);
if (dbg == false){//if it's true, we are doing everything anyway.
SolrPluginUtils.getDebugInterests(req.getParams().getParams(CommonParams.DEBUG), rb);
}
final RTimer timer = rb.isDebug() ? new RTimer() : null;
ShardHandler shardHandler1 = shardHandlerFactory.getShardHandler();
shardHandler1.checkDistributed(rb);
if (timer == null) {
// non-debugging prepare phase
for( SearchComponent c : components ) {
c.prepare(rb);
}
} else {
// debugging prepare phase
RTimer subt = timer.sub( "prepare" );
for( SearchComponent c : components ) {
rb.setTimer( subt.sub( c.getName() ) );
c.prepare(rb);
rb.getTimer().stop();
}
subt.stop();
}
if (!rb.isDistrib) {
// a normal non-distributed request
// The semantics of debugging vs not debugging are different enough that
// it makes sense to have two control loops
if(!rb.isDebug()) {
// Process
for( SearchComponent c : components ) {
c.process(rb);
}
}
else {
// Process
RTimer subt = timer.sub( "process" );
for( SearchComponent c : components ) {
rb.setTimer( subt.sub( c.getName() ) );
c.process(rb);
rb.getTimer().stop();
}
subt.stop();
timer.stop();
// add the timing info
if (rb.isDebugTimings()) {
rb.addDebugInfo("timing", timer.asNamedList() );
}
}
} else {
// a distributed request
if (rb.outgoing == null) {
rb.outgoing = new LinkedList();
}
rb.finished = new ArrayList();
int nextStage = 0;
do {
rb.stage = nextStage;
nextStage = ResponseBuilder.STAGE_DONE;
// call all components
for( SearchComponent c : components ) {
// the next stage is the minimum of what all components report
nextStage = Math.min(nextStage, c.distributedProcess(rb));
}
// check the outgoing queue and send requests
while (rb.outgoing.size() > 0) {
// submit all current request tasks at once
while (rb.outgoing.size() > 0) {
ShardRequest sreq = rb.outgoing.remove(0);
sreq.actualShards = sreq.shards;
if (sreq.actualShards==ShardRequest.ALL_SHARDS) {
sreq.actualShards = rb.shards;
}
sreq.responses = new ArrayList();
// TODO: map from shard to address[]
for (String shard : sreq.actualShards) {
ModifiableSolrParams params = new ModifiableSolrParams(sreq.params);
params.remove(ShardParams.SHARDS); // not a top-level request
params.set(CommonParams.DISTRIB, "false"); // not a top-level request
params.remove("indent");
params.remove(CommonParams.HEADER_ECHO_PARAMS);
params.set(ShardParams.IS_SHARD, true); // a sub (shard) request
params.set(ShardParams.SHARD_URL, shard); // so the shard knows what was asked
if (rb.requestInfo != null) {
// we could try and detect when this is needed, but it could be tricky
params.set("NOW", Long.toString(rb.requestInfo.getNOW().getTime()));
}
String shardQt = params.get(ShardParams.SHARDS_QT);
if (shardQt == null) {
params.remove(CommonParams.QT);
} else {
params.set(CommonParams.QT, shardQt);
}
shardHandler1.submit(sreq, shard, params);
}
}
// now wait for replies, but if anyone puts more requests on
// the outgoing queue, send them out immediately (by exiting
// this loop)
boolean tolerant = rb.req.getParams().getBool(ShardParams.SHARDS_TOLERANT, false);
while (rb.outgoing.size() == 0) {
ShardResponse srsp = tolerant ?
shardHandler1.takeCompletedIncludingErrors():
shardHandler1.takeCompletedOrError();
if (srsp == null) break; // no more requests to wait for
// Was there an exception?
if (srsp.getException() != null) {
// If things are not tolerant, abort everything and rethrow
if(!tolerant) {
shardHandler1.cancelAll();
if (srsp.getException() instanceof SolrException) {
throw (SolrException)srsp.getException();
} else {
throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, srsp.getException());
}
} else {
if(rsp.getResponseHeader().get("partialResults") == null) {
rsp.getResponseHeader().add("partialResults", Boolean.TRUE);
}
}
}
rb.finished.add(srsp.getShardRequest());
// let the components see the responses to the request
for(SearchComponent c : components) {
c.handleResponses(rb, srsp.getShardRequest());
}
}
}
for(SearchComponent c : components) {
c.finishStage(rb);
}
// we are done when the next stage is MAX_VALUE
} while (nextStage != Integer.MAX_VALUE);
}
}
//////////////////////// SolrInfoMBeans methods //////////////////////
@Override
public String getDescription() {
StringBuilder sb = new StringBuilder();
sb.append("Search using components: ");
if( components != null ) {
for(SearchComponent c : components){
sb.append(c.getName());
sb.append(",");
}
}
return sb.toString();
}
@Override
public String getSource() {
return "$URL: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_7/solr/core/src/java/org/apache/solr/handler/component/SearchHandler.java $";
}
}
// TODO: generalize how a comm component can fit into search component framework
// TODO: statics should be per-core singletons
