package com.fasterxml.clustermate.servlet;
import java.io.IOException;
import com.codahale.metrics.Timer.Context;
import com.fasterxml.storemate.store.util.OperationDiagnostics;
import com.fasterxml.clustermate.api.EntryKey;
import com.fasterxml.clustermate.api.EntryKeyConverter;
import com.fasterxml.clustermate.service.SharedServiceStuff;
import com.fasterxml.clustermate.service.cfg.ServiceConfig;
import com.fasterxml.clustermate.service.cluster.ClusterViewByServer;
import com.fasterxml.clustermate.service.metrics.AllOperationMetrics;
import com.fasterxml.clustermate.service.metrics.ExternalOperationMetrics;
import com.fasterxml.clustermate.service.metrics.OperationMetrics;
import com.fasterxml.clustermate.service.store.StoreHandler;
import com.fasterxml.clustermate.service.store.StoredEntry;
@SuppressWarnings("serial")
public class StoreListServlet<K extends EntryKey,
E extends StoredEntry<K>
>
extends ServletWithMetricsBase
{
/*
/**********************************************************************
/* Helper objects
/**********************************************************************
*/
protected final StoreHandler<K,E,?> _storeHandler;
protected final EntryKeyConverter<K> _keyConverter;
/*
/**********************************************************************
/* Metrics info
/**********************************************************************
*/
protected final OperationMetrics _listMetrics;
/*
/**********************************************************************
/* Life-cycle
/**********************************************************************
*/
public StoreListServlet(SharedServiceStuff stuff, ClusterViewByServer clusterView,
StoreHandler<K,E,?> storeHandler)
{
// null -> use servlet path base as-is
super(stuff, clusterView, null);
_storeHandler = storeHandler;
_keyConverter = stuff.getKeyConverter();
final ServiceConfig serviceConfig = stuff.getServiceConfig();
if (serviceConfig.metricsEnabled) {
_listMetrics = OperationMetrics.forListingOperation(serviceConfig, "entryList");
} else {
_listMetrics = null;
}
}
@Override
public void fillOperationMetrics(AllOperationMetrics metrics) {
metrics.LIST = ExternalOperationMetrics.create(_listMetrics);
}
/*
/**********************************************************************
/* Default implementation for key handling
/**********************************************************************
*/
protected K _findKey(ServletServiceRequest request, ServletServiceResponse response)
{
return _keyConverter.extractFromPath(request);
}
/*
/**********************************************************************
/* Delegated methods for more control
/**********************************************************************
*/
@Override
public void handleGet(ServletServiceRequest request, ServletServiceResponse response,
OperationDiagnostics stats) throws IOException
{
final OperationMetrics metrics = _listMetrics;
Context timer = (metrics == null) ? null : metrics.start();
try {
K prefix = _findKey(request, response);
if (prefix == null) {
super.handleGet(request, response, stats);
return;
}
_storeHandler.listEntries(request, response, prefix, stats);
_addStdHeaders(response);
response.writeOut(null);
} finally {
if (metrics != null) {
metrics.finish(timer, stats);
}
}
}
@Override
public void handleDelete(ServletServiceRequest request, ServletServiceResponse response,
OperationDiagnostics stats) throws IOException
{
final OperationMetrics metrics = _listMetrics;
Context timer = (metrics == null) ? null : metrics.start();
try {
K prefix = _findKey(request, response);
if (prefix == null) {
super.handleDelete(request, response, stats);
return;
}
_storeHandler.removeEntries(request, response, prefix, stats);
_addStdHeaders(response);
response.writeOut(null);
} finally {
if (metrics != null) {
metrics.finish(timer, stats);
}
}
}
}