前言
1、jmx大致懂了。
2、但是,jmx在spring中的应用有点懵懵懂懂的。
例如
//这个刷新兽医列表缓存的功能,代码已经很清楚了,但是具体是怎么来操作的呢?
/**
* Refresh the cache of Vets that the Clinic is holding.
* @see org.springframework.samples.petclinic.Clinic#getVets()
*/
@ManagedOperation
@Transactional(readOnly = true)
public void refreshVetsCache() throws DataAccessException {
synchronized (this.vets) {
this.logger.info("Refreshing vets cache");
// Retrieve the list of all vets.
this.vets.clear();
this.vets.addAll(this.simpleJdbcTemplate.query(
"SELECT id, first_name, last_name FROM vets ORDER BY last_name,first_name",
ParameterizedBeanPropertyRowMapper.newInstance(Vet.class)));
// Retrieve the list of all possible specialties.
final List<Specialty> specialties = this.simpleJdbcTemplate.query(
"SELECT id, name FROM specialties",
ParameterizedBeanPropertyRowMapper.newInstance(Specialty.class));
// Build each vet's list of specialties.
for (Vet vet : this.vets) {
final List<Integer> vetSpecialtiesIds = this.simpleJdbcTemplate.query(
"SELECT specialty_id FROM vet_specialties WHERE vet_id=?",
new ParameterizedRowMapper<Integer>() {
public Integer mapRow(ResultSet rs, int row) throws SQLException {
return Integer.valueOf(rs.getInt(1));
}},
vet.getId().intValue());
for (int specialtyId : vetSpecialtiesIds) {
Specialty specialty = EntityUtils.getById(specialties, Specialty.class, specialtyId);
vet.addSpecialty(specialty);
}
}
}
}