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package net.sf.basedb.opengrid; |
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import java.util.Date; |
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import org.json.simple.JSONObject; |
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import net.sf.basedb.opengrid.config.ClusterConfig; |
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import net.sf.basedb.opengrid.json.JSONOptions; |
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import net.sf.basedb.util.formatter.DateFormatter; |
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|
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/** |
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Holds the result from executing a single command on a cluster. |
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|
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@author nicklas |
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@since 1.0 |
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*/ |
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public class CmdResult<R> |
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{ |
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private final String cmd; |
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private int exitStatus; |
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private String stdout; |
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private String stderr; |
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private R result; |
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private RuntimeException exception; |
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|
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/** |
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Creates a new result instance. |
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*/ |
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public CmdResult(String cmd) |
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{ |
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this.cmd = cmd; |
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} |
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|
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/** |
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Clone a cmd result instance except for the result field. |
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*/ |
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public CmdResult(CmdResult<?> other) |
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{ |
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this.cmd = other.cmd; |
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this.exitStatus = other.exitStatus; |
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this.stdout = other.stdout; |
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this.stderr = other.stderr; |
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this.exception = other.exception; |
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} |
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|
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/** |
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Get the command that was executed. |
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*/ |
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public String getCmd() |
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{ |
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return cmd; |
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} |
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|
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/** |
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Calculate a hard timeout for the command that depends on the given |
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soft timeout. The soft timeout is the timeout that is given to |
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{@link AbstractSession#execute(CmdResult, int)}. If the command has not |
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finished after the soft timeout it is allowed to continue as long as it |
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is providing data on either the stdout or stderr stream until the |
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hard timeout is reached. If this happens the command is aborted. |
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|
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The default implementation allows a hard timeout that is 10 times |
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longer than the soft timeout. Subclasses may override this implementation |
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if the need a different timeout. |
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|
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@param timeout The soft timeout in seconds |
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@return The hard timeout in seconds |
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@since 1.4 |
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*/ |
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public int getHardTimeout(int timeout) |
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{ |
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return timeout * 10; |
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} |
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protected void setExitStatus(int exitStatus) |
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{ |
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this.exitStatus = exitStatus; |
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} |
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|
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/** |
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Get the exit status of the command. A value of 0 should indicate success, |
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all other values some kind of error. |
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*/ |
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public int getExitStatus() |
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{ |
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return exitStatus; |
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} |
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|
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protected void setResult(R result) |
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{ |
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this.result = result; |
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} |
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|
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/** |
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Get the result that was parsed from the command output. |
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Normally, the result is only available if the exit status |
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is 0. However the {@link OpenGridSession#executeCmd(String, int)} |
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will return stderr as the result if the command failed. |
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*/ |
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public R getResult() |
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{ |
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return result; |
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} |
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|
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protected void setStdout(String stdout) |
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{ |
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this.stdout = stdout; |
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} |
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/** |
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Get the text written to the standard output stream from the command. |
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*/ |
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public String getStdout() |
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{ |
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return stdout; |
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} |
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protected void setStderr(String stderr) |
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{ |
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this.stderr = stderr; |
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} |
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/** |
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Get the text written to standard error stream from the command. |
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*/ |
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public String getStderr() |
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{ |
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return stderr; |
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} |
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protected void setException(Exception ex) |
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{ |
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this.exception = ex instanceof RuntimeException ? (RuntimeException)ex : new RuntimeException(ex); |
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this.stderr = ex.getMessage(); |
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this.exitStatus = -1; |
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} |
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/** |
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Get the exception that may have caused a failure. Exception are typically |
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indications that something was wrong on the local server and not the |
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remote server. |
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*/ |
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public RuntimeException getException() |
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{ |
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return exception; |
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} |
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|
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/** |
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Throws an exception if the exist status is not 0. If an exception |
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has been set by {@link #setException(Exception)} that exception is |
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re-thrown, otherwise a new RuntimeException is created with stderr |
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(or stdout in case stderr is empty) as the message text. |
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*/ |
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public void throwExceptionIfNonZeroExitStatus() |
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{ |
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if (exitStatus == 0) return; |
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RuntimeException e = exception; |
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if (e == null) |
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{ |
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e = new RuntimeException(stderr != null ? stderr : stdout); |
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} |
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throw e; |
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} |
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|
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/** |
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This method is called after the command has been executed and |
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the exit code, stdout and stderr has been updated. Subclasses |
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can override this method to take actions. The default implementation |
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does nothing. |
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*/ |
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protected void parseResult() |
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{} |
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|
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@Override |
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public String toString() |
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{ |
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if (exitStatus == 0) |
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{ |
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return cmd + ": " + stdout; |
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} |
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else |
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{ |
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return cmd + ": [" + exitStatus + "] " + stderr; |
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} |
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} |
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|
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/** |
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Get the information in this result as a JSON object. |
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The following properties are set by default: |
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|
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* cmd |
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* exitStatus |
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* stdout |
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* stderr |
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*/ |
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public JSONObject asJSONObject(JSONOptions options) |
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{ |
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JSONObject json = new JSONObject(); |
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json.put("cmd", getCmd()); |
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json.put("exitStatus", getExitStatus()); |
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json.put("stdout", getStdout()); |
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json.put("stderr", getStderr()); |
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return json; |
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} |
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|
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/** |
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An implementation that set the result to 'stdout' if |
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the exit code is 0, and to 'stderr' if not. |
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@since 1.4 |
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*/ |
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public static class StdioResult |
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extends CmdResult<String> |
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{ |
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|
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public StdioResult(String cmd) |
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{ |
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super(cmd); |
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} |
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|
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@Override |
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protected void parseResult() |
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{ |
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setResult(getExitStatus()==0 ? getStdout() : getStderr()); |
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} |
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} |
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|
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/** |
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An implementation that parses the 'stdout' to a date |
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if the exit code is 0. |
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@since 1.4 |
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*/ |
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public static class DateResult |
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extends CmdResult<Date> |
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{ |
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|
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private final DateFormatter dateFormat; |
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|
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/** |
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Create a date result using the default date format. |
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@see ClusterConfig#DATE_CMD |
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*/ |
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public DateResult(String cmd) |
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{ |
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this(cmd, ClusterConfig.DATE_CMD); |
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} |
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|
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/** |
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Create a date result using a custom date format. |
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*/ |
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public DateResult(String cmd, DateFormatter dateFormat) |
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{ |
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super(cmd); |
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this.dateFormat = dateFormat; |
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} |
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|
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@Override |
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protected void parseResult() |
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{ |
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if (getExitStatus() != 0) return; |
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try |
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{ |
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setResult(dateFormat.parseString(getStdout())); |
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} |
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catch (RuntimeException ex) |
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{ |
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setException(ex); |
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} |
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} |
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} |
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} |