/*
* ModeShape (http://www.modeshape.org)
*
* Licensed 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.modeshape.jcr.api.monitor;
import java.util.Collections;
import java.util.EnumSet;
import java.util.Set;
import javax.jcr.AccessDeniedException;
import javax.jcr.RepositoryException;
/**
* A thread-safe component that provides histories and statistics on a variety of metrics.
*
* @since 3.0
*/
public interface RepositoryMonitor {
Set<DurationMetric> ALL_DURATION_METRICS = Collections.unmodifiableSet(EnumSet.allOf(DurationMetric.class));
Set<ValueMetric> ALL_VALUE_METRICS = Collections.unmodifiableSet(EnumSet.allOf(ValueMetric.class));
Set<Window> ALL_WINDOWS = Collections.unmodifiableSet(EnumSet.allOf(Window.class));
/**
* A monitor without history.
*/
RepositoryMonitor EMPTY_MONITOR = new RepositoryMonitor() {
/**
* {@inheritDoc}
* <p>
* <strong>Always returns {@link RepositoryMonitor#ALL_DURATION_METRICS}.</strong>
*
* @see org.modeshape.jcr.api.monitor.RepositoryMonitor#getAvailableDurationMetrics()
*/
@Override
public Set<DurationMetric> getAvailableDurationMetrics() {
return ALL_DURATION_METRICS;
}
/**
* {@inheritDoc}
* <p>
* <strong>Always returns {@link RepositoryMonitor#ALL_VALUE_METRICS}.</strong>
*
* @see org.modeshape.jcr.api.monitor.RepositoryMonitor#getAvailableValueMetrics()
*/
@Override
public Set<ValueMetric> getAvailableValueMetrics() {
return ALL_VALUE_METRICS;
}
/**
* {@inheritDoc}
* <p>
* <strong>Always returns {@link RepositoryMonitor#ALL_WINDOWS}.</strong>
*
* @see org.modeshape.jcr.api.monitor.RepositoryMonitor#getAvailableWindows()
*/
@Override
public Set<Window> getAvailableWindows() {
return ALL_WINDOWS;
}
/**
* {@inheritDoc}
* <p>
* <strong>Always returns {@link History#NO_HISTORY}.</strong>
*
* @see org.modeshape.jcr.api.monitor.RepositoryMonitor#getHistory(org.modeshape.jcr.api.monitor.ValueMetric,
* org.modeshape.jcr.api.monitor.Window)
*/
@Override
public History getHistory( ValueMetric metric,
Window windowInTime ) {
return History.NO_HISTORY;
}
/**
* {@inheritDoc}
* <p>
* <strong>Always returns {@link History#NO_HISTORY}.</strong>
*
* @see org.modeshape.jcr.api.monitor.RepositoryMonitor#getHistory(org.modeshape.jcr.api.monitor.DurationMetric,
* org.modeshape.jcr.api.monitor.Window)
*/
@Override
public History getHistory( DurationMetric metric,
Window windowInTime ) {
return History.NO_HISTORY;
}
/**
* {@inheritDoc}
* <p>
* <strong>Always returns an empty duration activity array.</strong>
*
* @see org.modeshape.jcr.api.monitor.RepositoryMonitor#getLongestRunning(org.modeshape.jcr.api.monitor.DurationMetric)
*/
@Override
public DurationActivity[] getLongestRunning( DurationMetric metric ) {
return DurationActivity.NO_DURATION_RECORDS;
}
};
/**
* Get the ValueMetric enumerations that are available for use by the caller with {@link #getHistory(ValueMetric, Window)}.
*
* @return the immutable set of ValueMetric instances; never null but possibly empty if the caller has no permissions to see
* any value metrics
* @see #getHistory(ValueMetric, Window)
*/
Set<ValueMetric> getAvailableValueMetrics();
/**
* Get the DurationMetric enumerations that are available for use by the caller with
* {@link #getHistory(DurationMetric, Window)}.
*
* @return the immutable set of DurationMetric instances; never null but possibly empty if the caller has no permissions to
* see any duration metrics
* @see #getHistory(DurationMetric, Window)
* @see #getLongestRunning(DurationMetric)
*/
Set<DurationMetric> getAvailableDurationMetrics();
/**
* Get the Window enumerations that are available for use by the caller with {@link #getHistory(DurationMetric, Window)} and
* {@link #getHistory(ValueMetric, Window)}.
*
* @return the immutable set of DurationMetric instances; never null but possibly empty if the caller has no permissions to
* see any windows
* @see #getHistory(DurationMetric, Window)
* @see #getHistory(ValueMetric, Window)
*/
Set<Window> getAvailableWindows();
/**
* Get the statics for the specified value metric during the given window in time. The oldest statistics will be first, while
* the newest statistics will be last.
*
* @param metric the value metric; may not be null
* @param windowInTime the window specifying which statistics are to be returned; may not be null
* @return the history of the metrics; never null but possibly empty if there are no statistics being captures for this
* repository
* @throws AccessDeniedException if the session does not have privileges to monitor the repository
* @throws RepositoryException if there is an error obtaining the history
* @see #getAvailableValueMetrics()
* @see #getAvailableWindows()
*/
public History getHistory( ValueMetric metric,
Window windowInTime ) throws AccessDeniedException, RepositoryException;
/**
* Get the statics for the specified duration metric during the given window in time. The oldest statistics will be first,
* while the newest statistics will be last.
*
* @param metric the duration metric; may not be null
* @param windowInTime the window specifying which statistics are to be returned; may not be null
* @return the history of the metrics; never null but possibly empty if there are no statistics being captures for this
* repository
* @throws AccessDeniedException if the session does not have privileges to monitor the repository
* @throws RepositoryException if there is an error obtaining the history
* @see #getAvailableDurationMetrics()
* @see #getAvailableWindows()
*/
public History getHistory( DurationMetric metric,
Window windowInTime ) throws AccessDeniedException, RepositoryException;
/**
* Get the longest-running activities recorded for the specified metric. The results contain the duration records in order of
* increasing duration, with the activity with the longest duration appearing last in the array.
*
* @param metric the duration metric; may not be null
* @return the activities with the longest durations; never null but possibly empty if no such activities were performed
* @throws AccessDeniedException if the session does not have privileges to monitor the repository
* @throws RepositoryException if there is an error obtaining the history
* @see #getAvailableDurationMetrics()
*/
public DurationActivity[] getLongestRunning( DurationMetric metric ) throws AccessDeniedException, RepositoryException;
}