/
AbstractMachineManager.java
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/
AbstractMachineManager.java
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package com.hubspot.singularity.data;
import java.util.List;
import java.util.Map;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.utils.ZKPaths;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.Optional;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.hubspot.singularity.MachineState;
import com.hubspot.singularity.SingularityCreateResult;
import com.hubspot.singularity.SingularityDeleteResult;
import com.hubspot.singularity.SingularityMachineAbstraction;
import com.hubspot.singularity.SingularityMachineStateHistoryUpdate;
import com.hubspot.singularity.config.SingularityConfiguration;
import com.hubspot.singularity.data.transcoders.Transcoder;
public abstract class AbstractMachineManager<T extends SingularityMachineAbstraction<T>> extends CuratorAsyncManager {
private static final Logger LOG = LoggerFactory.getLogger(AbstractMachineManager.class);
private static final String HISTORY_PATH = "history";
private final Transcoder<T> transcoder;
private final Transcoder<SingularityMachineStateHistoryUpdate> historyTranscoder;
public AbstractMachineManager(CuratorFramework curator, SingularityConfiguration configuration, Transcoder<T> transcoder, Transcoder<SingularityMachineStateHistoryUpdate> historyTranscoder) {
super(curator, configuration);
this.transcoder = transcoder;
this.historyTranscoder = historyTranscoder;
}
protected abstract String getRoot();
private String getHistoryPath(String objectId) {
return ZKPaths.makePath(getObjectPath(objectId), HISTORY_PATH);
}
public List<SingularityMachineStateHistoryUpdate> getHistory(String objectId) {
return getAsyncChildren(getHistoryPath(objectId), historyTranscoder);
}
public List<T> getObjects() {
return getObjects(getRoot());
}
public int getNumObjectsAtState(MachineState state) {
return getObjectsFiltered(state).size();
}
public Map<String, T> getObjectsByIdForState(MachineState state) {
List<T> filteredObjects = getObjectsFiltered(state);
Map<String, T> filteredObjectIds = Maps.newHashMapWithExpectedSize(filteredObjects.size());
for (T filteredObject : filteredObjects) {
filteredObjectIds.put(filteredObject.getId(), filteredObject);
}
return filteredObjectIds;
}
public List<T> getObjectsFiltered(MachineState state) {
return getObjectsFiltered(Optional.of(state));
}
public List<T> getObjectsFiltered(Optional<MachineState> state) {
List<T> objects = getObjects();
if (!state.isPresent()) {
return objects;
}
return getObjectsFiltered(objects, state.get());
}
private List<T> getObjectsFiltered(List<T> objects, MachineState state) {
List<T> filtered = Lists.newArrayListWithCapacity(objects.size());
for (T object : objects) {
if (object.getCurrentState().getState() == state) {
filtered.add(object);
}
}
return filtered;
}
private String getObjectPath(String objectId) {
return ZKPaths.makePath(getRoot(), objectId);
}
public Optional<T> getObject(String objectId) {
return getData(getObjectPath(objectId), transcoder);
}
protected List<T> getObjects(String root) {
return getAsyncChildren(root, transcoder);
}
public SingularityDeleteResult removed(String objectId) {
return delete(getObjectPath(objectId));
}
public enum StateChangeResult {
FAILURE_NOT_FOUND, FAILURE_ALREADY_AT_STATE, FAILURE_ILLEGAL_TRANSITION, SUCCESS;
}
public StateChangeResult changeState(String objectId, MachineState newState, Optional<String> user) {
Optional<T> maybeObject = getObject(objectId);
if (!maybeObject.isPresent()) {
return StateChangeResult.FAILURE_NOT_FOUND;
}
final T object = maybeObject.get();
return changeState(object, newState, user);
}
public StateChangeResult changeState(T object, MachineState newState, Optional<String> user) {
if (object.getCurrentState().getState() == newState) {
return StateChangeResult.FAILURE_ALREADY_AT_STATE;
}
if (newState == MachineState.STARTING_DECOMMISSION && object.getCurrentState().getState().isDecommissioning()) {
return StateChangeResult.FAILURE_ILLEGAL_TRANSITION;
}
// can't jump from FROZEN to DECOMMISSIONING or DECOMMISSIONED
if (((newState == MachineState.DECOMMISSIONING) || (newState == MachineState.DECOMMISSIONED)) && (object.getCurrentState().getState() == MachineState.FROZEN)) {
return StateChangeResult.FAILURE_ILLEGAL_TRANSITION;
}
// can't jump from a decommissioning state to FROZEN
if ((newState == MachineState.FROZEN) && object.getCurrentState().getState().isDecommissioning()) {
return StateChangeResult.FAILURE_ILLEGAL_TRANSITION;
}
SingularityMachineStateHistoryUpdate newStateUpdate = new SingularityMachineStateHistoryUpdate(object.getId(), newState, System.currentTimeMillis(), user);
LOG.debug("{} changing state from {} to {} by {}", object.getId(), object.getCurrentState().getState(), newState, user);
saveObject(object.changeState(newStateUpdate));
return StateChangeResult.SUCCESS;
}
private String getHistoryUpdatePath(SingularityMachineStateHistoryUpdate historyUpdate) {
final String historyChildPath = String.format("%s-%s", historyUpdate.getState().name(), historyUpdate.getTimestamp());
return ZKPaths.makePath(getHistoryPath(historyUpdate.getObjectId()), historyChildPath);
}
private SingularityCreateResult saveHistoryUpdate(SingularityMachineStateHistoryUpdate historyUpdate) {
return create(getHistoryUpdatePath(historyUpdate), historyUpdate, historyTranscoder);
}
public SingularityDeleteResult deleteObject(String objectId) {
return delete(getObjectPath(objectId));
}
public SingularityCreateResult saveObject(T object) {
saveHistoryUpdate(object.getCurrentState());
return save(getObjectPath(object.getId()), object, transcoder);
}
}