| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.ambari.server.state; |
| |
| import org.apache.ambari.server.AmbariException; |
| |
| public enum State { |
| /** |
| * Initial/Clean state. |
| */ |
| INIT, |
| /** |
| * In the process of installing. |
| */ |
| INSTALLING, |
| /** |
| * Install failed. |
| */ |
| INSTALL_FAILED, |
| /** |
| * State when install completed successfully. |
| */ |
| INSTALLED, |
| /** |
| * State when dependencies have been resolved successfully. |
| */ |
| RESOLVED, |
| /** |
| * State when dependency resolution fails. |
| */ |
| RESOLVE_FAILED, |
| /** |
| * In the process of starting. |
| */ |
| STARTING, |
| /** |
| * State when start completed successfully. |
| */ |
| STARTED, |
| /** |
| * In the process of stopping. |
| */ |
| STOPPING, |
| /** |
| * In the process of uninstalling. |
| */ |
| UNINSTALLING, |
| /** |
| * State when uninstall completed successfully. |
| */ |
| UNINSTALLED, |
| /** |
| * In the process of wiping out the install. |
| */ |
| WIPING_OUT, |
| /** |
| * In the process of upgrading the host component deployed bits. |
| * Valid only for host component state |
| */ |
| UPGRADING, |
| /** |
| * Disabled master's backup state |
| */ |
| DISABLED, |
| /** |
| * State could not be determined. |
| */ |
| UNKNOWN; |
| |
| /** |
| * Indicates whether or not it is a valid desired state. |
| * |
| * @return true if this is a valid desired state. |
| */ |
| public boolean isValidDesiredState() { |
| switch (this) { |
| case INIT: |
| case INSTALLED: |
| case STARTED: |
| case UNINSTALLED: |
| case DISABLED: |
| case RESOLVED: |
| case RESOLVE_FAILED: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| /** |
| * Indicates whether or not it is a valid state for the client component. |
| * |
| * @return true if this is a valid state for a client component. |
| */ |
| public boolean isValidClientComponentState() { |
| switch (this) { |
| case STARTING: |
| case STARTED: |
| case STOPPING: |
| return false; |
| default: |
| return true; |
| } |
| } |
| |
| /** |
| * Indicates whether or not the resource with this state can be removed. |
| * |
| * @return true if this is a removable state |
| */ |
| public boolean isRemovableState() { |
| switch (this) { |
| case INIT: |
| case INSTALLING: |
| case INSTALLED: |
| case INSTALL_FAILED: |
| case RESOLVED: |
| case RESOLVE_FAILED: |
| case UNINSTALLED: |
| case UNKNOWN: |
| case DISABLED: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| /** |
| * Utility method to determine whether or not a valid transition can be made from the given states. |
| * |
| * @param startState the starting state |
| * @param desiredState the desired state |
| * |
| * @return true iff a valid transition can be made from the starting state to the desired state |
| */ |
| public static boolean isValidStateTransition(State startState, State desiredState) { |
| switch(desiredState) { |
| case INSTALLED: |
| if (startState == State.INIT |
| || startState == State.UNINSTALLED |
| || startState == State.INSTALLED |
| || startState == State.INSTALLING |
| || startState == State.STARTED |
| || startState == State.INSTALL_FAILED |
| || startState == State.UPGRADING |
| || startState == State.STOPPING |
| || startState == State.UNKNOWN |
| || startState == State.DISABLED |
| || startState == State.RESOLVED) { |
| return true; |
| } |
| break; |
| case STARTED: |
| if (startState == State.INSTALLED |
| || startState == State.STARTING |
| || startState == State.STARTED) { |
| return true; |
| } |
| break; |
| case UNINSTALLED: |
| if (startState == State.INSTALLED |
| || startState == State.UNINSTALLED |
| || startState == State.UNINSTALLING) { |
| return true; |
| } |
| break; |
| case INIT: |
| if (startState == State.UNINSTALLED |
| || startState == State.INIT |
| || startState == State.WIPING_OUT) { |
| return true; |
| } |
| break; |
| case DISABLED: |
| if (startState == State.INSTALLED |
| || startState == State.INSTALL_FAILED |
| || startState == State.UNKNOWN) { |
| return true; |
| } |
| break; |
| case RESOLVED: |
| if (startState == State.INIT |
| || startState == State.RESOLVE_FAILED) { |
| return true; |
| } |
| break; |
| case INSTALL_FAILED: |
| if (startState == State.RESOLVED |
| || startState == State.INSTALLING) { |
| return true; |
| } |
| break; |
| } |
| return false; |
| } |
| |
| /** |
| * Utility method to determine whether or not the given desired state is valid for the given starting state. |
| * |
| * @param startState the starting state |
| * @param desiredState the desired state |
| * |
| * @return true iff the given desired state is valid for the given starting state |
| */ |
| public static boolean isValidDesiredStateTransition(State startState, State desiredState) { |
| switch(desiredState) { |
| case INSTALLED: |
| if (startState == State.INIT |
| || startState == State.UNINSTALLED |
| || startState == State.INSTALLED |
| || startState == State.STARTED |
| || startState == State.STOPPING |
| || startState == State.RESOLVED) { |
| return true; |
| } |
| break; |
| case STARTED: |
| if (startState == State.INSTALLED |
| || startState == State.STARTED) { |
| return true; |
| } |
| break; |
| case RESOLVED: |
| if (startState == State.INIT |
| || startState == State.RESOLVE_FAILED) { |
| return true; |
| } |
| break; |
| case RESOLVE_FAILED: |
| if (startState == State.INIT) { |
| return true; |
| } |
| break; |
| } |
| return false; |
| } |
| |
| /** |
| * Determine whether or not it is safe to update the configuration of the given service |
| * component host for the given states. |
| * |
| * @param serviceComponentHost the service component host |
| * @param currentState the current state |
| * @param desiredState the desired state |
| * |
| * @throws AmbariException if the changing of configuration is not supported |
| */ |
| public static void checkUpdateConfiguration( |
| ServiceComponentHost serviceComponentHost, |
| State currentState, State desiredState) |
| throws AmbariException { |
| |
| if (desiredState != null) { |
| if (!(desiredState == State.INIT |
| || desiredState == State.INSTALLED |
| || desiredState == State.STARTED)) { |
| throw new AmbariException("Changing of configs not supported" |
| + " for this transition" |
| + ", clusterName=" + serviceComponentHost.getClusterName() |
| + ", serviceName=" + serviceComponentHost.getServiceName() |
| + ", componentName=" + serviceComponentHost.getServiceComponentName() |
| + ", hostname=" + serviceComponentHost.getHostName() |
| + ", currentState=" + currentState |
| + ", newDesiredState=" + desiredState); |
| } |
| } |
| } |
| |
| } |