/*
* Copyright 2006-2014 the original author or authors.
*
* 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.springframework.batch.core;
import org.springframework.util.StringUtils;
import java.io.PrintWriter;
import java.io.Serializable;
import java.io.StringWriter;
/**
* Value object used to carry information about the status of a
* job or step execution.
*
* ExitStatus is immutable and therefore thread-safe.
*
* @author Dave Syer
*
*/
@SuppressWarnings("serial")
public class ExitStatus implements Serializable, Comparable<ExitStatus> {
/**
* Convenient constant value representing unknown state - assumed not
* continuable.
*/
public static final ExitStatus UNKNOWN = new ExitStatus("UNKNOWN");
/**
* Convenient constant value representing continuable state where processing
* is still taking place, so no further action is required. Used for
* asynchronous execution scenarios where the processing is happening in
* another thread or process and the caller is not required to wait for the
* result.
*/
public static final ExitStatus EXECUTING = new ExitStatus("EXECUTING");
/**
* Convenient constant value representing finished processing.
*/
public static final ExitStatus COMPLETED = new ExitStatus("COMPLETED");
/**
* Convenient constant value representing job that did no processing (e.g.
* because it was already complete).
*/
public static final ExitStatus NOOP = new ExitStatus("NOOP");
/**
* Convenient constant value representing finished processing with an error.
*/
public static final ExitStatus FAILED = new ExitStatus("FAILED");
/**
* Convenient constant value representing finished processing with
* interrupted status.
*/
public static final ExitStatus STOPPED = new ExitStatus("STOPPED");
private final String exitCode;
private final String exitDescription;
public ExitStatus(String exitCode) {
this(exitCode, "");
}
public ExitStatus(String exitCode, String exitDescription) {
super();
this.exitCode = exitCode;
this.exitDescription = exitDescription == null ? "" : exitDescription;
}
/**
* Getter for the exit code (defaults to blank).
*
* @return the exit code.
*/
public String getExitCode() {
return exitCode;
}
/**
* Getter for the exit description (defaults to blank)
*/
public String getExitDescription() {
return exitDescription;
}
/**
* Create a new {@link ExitStatus} with a logical combination of the exit
* code, and a concatenation of the descriptions. If either value has a
* higher severity then its exit code will be used in the result. In the
* case of equal severity, the exit code is replaced if the new value is
* alphabetically greater.<br>
* <br>
*
* Severity is defined by the exit code:
* <ul>
* <li>Codes beginning with EXECUTING have severity 1</li>
* <li>Codes beginning with COMPLETED have severity 2</li>
* <li>Codes beginning with NOOP have severity 3</li>
* <li>Codes beginning with STOPPED have severity 4</li>
* <li>Codes beginning with FAILED have severity 5</li>
* <li>Codes beginning with UNKNOWN have severity 6</li>
* </ul>
* Others have severity 7, so custom exit codes always win.<br>
*
* If the input is null just return this.
*
* @param status an {@link ExitStatus} to combine with this one.
* @return a new {@link ExitStatus} combining the current value and the
* argument provided.
*/
public ExitStatus and(ExitStatus status) {
if (status == null) {
return this;
}
ExitStatus result = addExitDescription(status.exitDescription);
if (compareTo(status) < 0) {
result = result.replaceExitCode(status.exitCode);
}
return result;
}
/**
* @param status an {@link ExitStatus} to compare
* @return greater than zero, 0, less than zero according to the severity and exit code
* @see java.lang.Comparable
*/
@Override
public int compareTo(ExitStatus status) {
if (severity(status) > severity(this)) {
return -1;
}
if (severity(status) < severity(this)) {
return 1;
}
return this.getExitCode().compareTo(status.getExitCode());
}
/**
* @param status
* @return
*/
private int severity(ExitStatus status) {
if (status.exitCode.startsWith(EXECUTING.exitCode)) {
return 1;
}
if (status.exitCode.startsWith(COMPLETED.exitCode)) {
return 2;
}
if (status.exitCode.startsWith(NOOP.exitCode)) {
return 3;
}
if (status.exitCode.startsWith(STOPPED.exitCode)) {
return 4;
}
if (status.exitCode.startsWith(FAILED.exitCode)) {
return 5;
}
if (status.exitCode.startsWith(UNKNOWN.exitCode)) {
return 6;
}
return 7;
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return String.format("exitCode=%s;exitDescription=%s", exitCode, exitDescription);
}
/**
* Compare the fields one by one.
*
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
return toString().equals(obj.toString());
}
/**
* Compatible with the equals implementation.
*
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
return toString().hashCode();
}
/**
* Add an exit code to an existing {@link ExitStatus}. If there is already a
* code present tit will be replaced.
*
* @param code the code to add
* @return a new {@link ExitStatus} with the same properties but a new exit
* code.
*/
public ExitStatus replaceExitCode(String code) {
return new ExitStatus(code, exitDescription);
}
/**
* Check if this status represents a running process.
*
* @return true if the exit code is "EXECUTING" or "UNKNOWN"
*/
public boolean isRunning() {
return "EXECUTING".equals(this.exitCode) || "UNKNOWN".equals(this.exitCode);
}
/**
* Add an exit description to an existing {@link ExitStatus}. If there is
* already a description present the two will be concatenated with a
* semicolon.
*
* @param description the description to add
* @return a new {@link ExitStatus} with the same properties but a new exit
* description
*/
public ExitStatus addExitDescription(String description) {
StringBuilder buffer = new StringBuilder();
boolean changed = StringUtils.hasText(description) && !exitDescription.equals(description);
if (StringUtils.hasText(exitDescription)) {
buffer.append(exitDescription);
if (changed) {
buffer.append("; ");
}
}
if (changed) {
buffer.append(description);
}
return new ExitStatus(exitCode, buffer.toString());
}
/**
* Extract the stack trace from the throwable provided and append it to
* the exist description.
*
* @param throwable
* @return a new ExitStatus with the stack trace appended
*/
public ExitStatus addExitDescription(Throwable throwable) {
StringWriter writer = new StringWriter();
throwable.printStackTrace(new PrintWriter(writer));
String message = writer.toString();
return addExitDescription(message);
}
/**
* @param status the exit code to be evaluated
* @return true if the value matches a known exit code
*/
public static boolean isNonDefaultExitStatus(ExitStatus status) {
return status == null || status.getExitCode() == null ||
status.getExitCode().equals(ExitStatus.COMPLETED.getExitCode()) ||
status.getExitCode().equals(ExitStatus.EXECUTING.getExitCode()) ||
status.getExitCode().equals(ExitStatus.FAILED.getExitCode()) ||
status.getExitCode().equals(ExitStatus.NOOP.getExitCode()) ||
status.getExitCode().equals(ExitStatus.STOPPED.getExitCode()) ||
status.getExitCode().equals(ExitStatus.UNKNOWN.getExitCode());
}
}