package com.fasterxml.clustermate.service;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.fasterxml.clustermate.api.ClusterMateConstants;
import com.fasterxml.storemate.shared.IpAndPort;
public abstract class HandlerBase
{
protected final Logger LOG = LoggerFactory.getLogger(getClass());
/*
/**********************************************************************
/* Helper methods, query param handling
/**********************************************************************
*/
protected Integer _findIntParam(ServiceRequest request, String key)
{
String str = request.getQueryParameter(key);
if (str == null || (str = str.trim()).isEmpty()) {
return null;
}
try {
return Integer.valueOf(str);
} catch (IllegalArgumentException e) {
return null;
}
}
protected long _findLongParam(ServiceRequest request, String key)
{
String str = request.getQueryParameter(key);
if (str == null || (str = str.trim()).isEmpty()) {
return 0L;
}
try {
return Long.valueOf(str);
} catch (IllegalArgumentException e) {
return 0L;
}
}
protected IpAndPort getCallerQueryParam(ServiceRequest request)
{
String str = request.getQueryParameter(ClusterMateConstants.HTTP_QUERY_PARAM_CALLER);
if (str == null || (str = str.trim()).length() == 0) {
return null;
}
try {
return new IpAndPort(str);
} catch (Exception e) {
LOG.warn("Invalid value for {}: '{}', problem: {}",
ClusterMateConstants.HTTP_QUERY_PARAM_CALLER,
str, e.getMessage());
return null;
}
}
/*
/**********************************************************************
/* Helper methods, header handling
/**********************************************************************
*/
protected boolean _acceptSmileContentType(ServiceRequest request) {
String acceptHeader = request.getHeader(ClusterMateConstants.HTTP_HEADER_ACCEPT);
// what do they request? If not known, serve JSON (assumed to be from browser)
return (acceptHeader != null)
&& acceptHeader.trim().indexOf(ClusterMateConstants.CONTENT_TYPE_SMILE) >= 0;
}
/*
/**********************************************************************
/* Helper methods, error processing
/**********************************************************************
*/
// public since it's called from SyncListServlet
@SuppressWarnings("unchecked")
public <OUT extends ServiceResponse> OUT missingArgument(ServiceResponse response, String argId) {
return (OUT) badRequest(response, "Missing query parameter '"+argId+"'");
}
// public since it's called from SyncListServlet
@SuppressWarnings("unchecked")
public <OUT extends ServiceResponse> OUT invalidArgument(ServiceResponse response, String argId, String argValue)
{
if (argValue == null) {
return (OUT) missingArgument(response, argId);
}
return (OUT) badRequest(response, "Invalid query parameter '"+argId+"': value '"+argValue+"'");
}
protected <OUT extends ServiceResponse> OUT badRequest(ServiceResponse response, String errorTemplate, Object... args) {
String msg = (args == null || args.length == 0) ? errorTemplate : String.format(errorTemplate, args);
return _badRequest(response, msg);
}
protected abstract <OUT extends ServiceResponse> OUT _badRequest(ServiceResponse response, String msg);
}